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Watch Maker Cast Episode 41, showcasing impressive projects by skilled makers such as a super-fast audio chip, Nixie tube-inspired LED design, and a spectrum analyzer with stunning visuals. Discover these fascinating creations and get inspired!

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[0:01] okay we’re live it’s maker cast episode
[0:04] 41 hosted by me atomic 14.
[0:08] hey who’s on the show today who are the
[0:11] stars oh hang on let’s talk about mickey
[0:13] cast
[0:14] i’ve got my slide deck i’m not even
[0:16] following it so what is it cast
[0:18] makercast is a show that hops from
[0:20] channel to channel show casting
[0:22] different makers on youtube letting them
[0:24] show off the projects they’re working on
[0:25] and giving you a chance to sample
[0:27] someone different so on today’s show
[0:29] actually what is the first of all to
[0:31] make a cast
[0:32] it’s really important that you really
[0:34] must try and tell as many people as
[0:36] possible about it it’s rather fun and
[0:38] the more people you tell the better
[0:41] say that twice please
[0:44] right there so finally who’s on the show
[0:47] it’s the stars
[0:49] so we’ve got um
[0:51] braden lane he’ll be showing us some
[0:53] snake charming today
[0:55] we’ve got the
[0:57] electronic engineer he’ll be providing
[1:00] an electrifying experience
[1:02] we’ve got dave darko he’s got a new
[1:04] robotic companion to show us and of
[1:07] course there’s your host myself i’ve got
[1:08] a few things to show you as well and
[1:10] then finally we’ll have a quiz
[1:12] so let’s get on with the show i’ll
[1:14] remove my slimy dodgy slide deck
[1:17] and um
[1:18] i think we’ll start with we actually
[1:20] discussed who’s going to start does
[1:21] anyone not want to start no
[1:24] you wouldn’t like to start i just broke
[1:26] something
[1:27] okay
[1:30] um mark would you like to start
[1:32] sure no problem okay let’s make mark the
[1:35] style actually the two projects i want
[1:37] to show you
[1:38] um the one i already published is this
[1:42] uh
[1:43] twin
[1:44] uh audio visualizer
[1:46] it’s basically a builder on a teensy
[1:50] uh which is here
[1:52] and an audio board and it’s actually the
[1:55] audio board that i’m most interested in
[1:56] it’s a
[1:57] it’s a teensy audio board and uses a
[2:00] chip with the number sgtl5000
[2:04] and that’s really an amazing audio chip
[2:06] it’s actually
[2:07] so fast
[2:09] that i’m considering to use it on the
[2:11] esp32 as well
[2:13] so i want to migrate it
[2:15] and the reason why well i can show you
[2:17] when i plug it in
[2:27] it’s actually it’s a two displays and
[2:30] the one on the
[2:32] this side because that’s my left side
[2:35] nice
[2:36] there’s actually a vu meter
[2:38] it’s uh
[2:40] nothing special now i turn on the
[2:42] microphone and on the other display you
[2:44] see spectrum analyzer and
[2:46] you can see how fast this response is
[2:49] and you can do this up to uh
[2:52] let’s say 68 channels in stereo
[2:56] together with these two that’s 140
[2:58] channels
[2:59] and this is uh real time so
[3:02] that’s how fast it is and the speed is
[3:04] not due to the teensy because this is
[3:06] not really that much faster than the esp
[3:09] i think
[3:10] but it’s actually the audio chip
[3:12] because it has an onboard
[3:14] analyzer and it does all the analysis
[3:16] for me it’s also an mp3 player and a
[3:20] encoder
[3:21] it’s actually i think it’s a chip that’s
[3:23] you commonly used in in older cell
[3:25] phones
[3:26] and when i designed the pcb for it
[3:29] actually i was planning to get rid of
[3:30] the the audio board and just implement
[3:33] it on the
[3:34] the back plane by just by putting the
[3:36] chip there and i made the whole design
[3:38] and then i run into a problem with
[3:41] sooner or later i’ll encounter and
[3:42] that’s a chip shortage
[3:45] so i designed the pcb and i wasn’t able
[3:47] to get it assembled because no chips
[3:49] available whatsoever
[3:51] so that’s why i
[3:53] put back the audio board because those
[3:55] are still available for now
[3:58] and i will just save the other design
[4:00] for a later release
[4:02] um so that’s what i’ve been up to and my
[4:05] plan is to uh to take this audio board
[4:07] or at least the chip
[4:09] and implement it with the esp32 simply
[4:12] because the esp32 is so much cheaper
[4:14] than the teensy board
[4:17] and i want to implement it to this one
[4:19] as well
[4:20] because this is just a simple arduino
[4:22] but
[4:24] with this chip i have the possibility to
[4:26] increase the number of channels
[4:28] up to well 140 if you want there’s a lot
[4:31] of acrylic tiles
[4:33] so we’ll see about that
[4:36] and another project i’ve been working on
[4:39] this is actually this one
[4:44] it’s not that that’s special it’s a
[4:46] vu meter
[4:48] but the thing about it is the tubes
[4:49] because they
[4:52] really look like
[4:54] nixie tubes in n9 tubes
[4:56] yes and
[4:58] that’s not the case actually i will show
[5:00] them close up in a minute because in
[5:02] execute will not be able to show you all
[5:03] these colors
[5:07] and basically what i did and well this
[5:10] is a nixie tube
[5:12] this is an inline tube and it can show
[5:14] you an orange color
[5:17] and it’s not really really big if you
[5:19] want to build something like a spectrum
[5:20] analyzer
[5:21] like this one you need something bigger
[5:23] so
[5:24] in comparison this is a test tube from a
[5:26] laboratory it’s from glass it’s not that
[5:29] special but it’s
[5:31] it’s a lot bigger
[5:32] so what i did i
[5:34] designed a small pcb
[5:38] i guess it looks like the the famous led
[5:40] strips was the
[5:42] ws2812 i think
[5:44] and the difference is there are more
[5:46] leds on it
[5:48] and even the the
[5:50] i think the the the
[5:52] the lead strip was most let’s is 140
[5:55] lats per meter this is even even more
[6:00] and i put a little connector on it i had
[6:01] to solder all the lats all myself
[6:04] uh because for this small pcb
[6:06] there’s no assembly service unless you
[6:08] penalize them
[6:10] and that was for this time being was not
[6:12] necessary
[6:13] and then i just basically
[6:15] i i put it in the tube
[6:17] and i put a diffuser for it and to make
[6:20] it look more like an execute
[6:22] i actually
[6:24] my wife is killing me now i destroyed
[6:26] our screen door
[6:29] so i got the maze from the screen door
[6:31] and i put it in there
[6:34] [Music]
[6:36] what’s that
[6:37] you showed originally is that an
[6:39] original old one or is that a new yeah
[6:40] that’s an original old one in
[6:42] in nine
[6:44] right it’s called and this one is yeah
[6:46] this is the one i replicated
[6:49] so the maze is just there for a
[6:51] decoration it has no function of course
[6:53] because they’re just that’s inside but
[6:55] it gives this nostalgic look
[6:58] and of course
[7:00] it’s a as a vu meter
[7:03] let me see if i can do this without uh
[7:06] getting you a
[7:08] a copyright flag so i will just mute the
[7:10] audio
[7:13] we could sing if that helps oh it’s okay
[7:19] that’s normal actually we have moved
[7:20] like uh
[7:22] except uh yeah there was a
[7:24] pickup that
[7:25] stays floating you also cannot do it
[7:27] with an xc2
[7:28] that looks really cool that’s amazing
[7:30] yeah
[7:31] and my plan is actually i’m already
[7:33] built because i’m finishing up this
[7:35] video as we speak but uh you know
[7:37] editing takes some time i already
[7:39] started the analyzer in the same design
[7:42] so
[7:43] i’m up for building some tubes and
[7:45] that’s the soldier like i don’t know 140
[7:47] lats
[7:49] because i have to turn all these into
[7:52] tubes
[7:53] and then put them on there so i
[7:55] will be working on a kind of steampunk
[7:58] hook analyzer for the next few weeks
[8:04] yeah that’s really what i’ve been doing
[8:05] and what i’m up to
[8:08] that’s all i got to show today
[8:10] nice brilliant i love the chips i mean
[8:12] they are
[8:13] they are very cool
[8:17] because it’s so
[8:19] weird that i keep looking at the screen
[8:21] on the other side
[8:23] will you be
[8:25] putting those tubes up on tindy or
[8:27] anything or selling them or are they are
[8:28] they just for you
[8:30] uh well it’s open source of course and
[8:32] um because that’s one of my rules
[8:34] everything i publish i want to be open
[8:36] source
[8:37] now i do sell the pcbs but you could
[8:39] replace them with the led strips if
[8:42] you’re pleased with a lower density that
[8:44] could work
[8:45] but i will make them available and
[8:48] the electronic itself is just an esp32
[8:51] it’s not that spectacular there’s an
[8:52] esp32 and it has potentiometers and a
[8:55] few switches for some mods cool and did
[8:58] you analyze this the analyzer is a
[9:00] different thing this will be uh
[9:03] this will have a large pcb which will be
[9:04] on tindy of course
[9:06] someone’s asking how did you get the
[9:08] metallic caps into the test chips are
[9:10] they pleated i didn’t actually i didn’t
[9:13] i spray coated it
[9:19] that’s amazing
[9:23] some copper spray and
[9:25] painted it on the outside
[9:27] nice
[9:28] so basically you’re weathering your test
[9:30] tubes to make them look old and yeah
[9:33] that’s it that’s really nice yeah
[9:36] cool well thanks mark um
[9:39] dave we really are keeping on schedule
[9:41] this is amazing um yeah there’s actually
[9:43] i’m actually showing a clock
[9:45] [Laughter]
[9:48] nice
[9:49] i had i i had a timer going right now so
[9:52] yeah you had eight minutes wonderful
[9:54] so i’m starting my timer now
[9:58] over to you let me make you
[10:00] the main person
[10:02] yes i’m still i was just uh inspired to
[10:05] look for something very old that i
[10:07] worked on at one point
[10:10] and i’m still scrolling on my pages so i
[10:12] don’t actually
[10:13] i was like what did i post there it’s
[10:16] it’s so
[10:17] so
[10:18] many things and i just wanted to say
[10:21] that i really like leds and jars and and
[10:24] glass tubes and stuff so i did some
[10:27] projects myself the mixie tube
[10:30] or the fake nixie tubes with uh leds and
[10:34] yeah i had a face where uh put oh wow
[10:36] this is home i have no idea what i did
[10:39] there
[10:42] anyways i’m
[10:43] giving this like
[10:46] is it this no it’s not
[10:51] it’s amazing what we have that we’ve
[10:52] done in the past but
[10:54] yeah
[10:55] and then you look at it when you think
[10:57] i have no idea how that worked or who
[10:59] built that and then when yeah
[11:01] some of the code is even worse when it’s
[11:03] just kind of people in this foundation
[11:05] this is terrible
[11:08] look at this random person with the same
[11:10] interest that i have
[11:14] i’ve even found
[11:15] when i’ve been googling questions i
[11:17] found my own answers
[11:21] which which is kind of good because then
[11:23] you’re answering yourself so there’s no
[11:25] harm in that i guess
[11:27] okay i really can’t find it this is
[11:29] boring i’m just scrolling stuff um
[11:33] yeah so uh
[11:35] let me just quickly
[11:37] swap again
[11:39] and to answer the first question that i
[11:41] had even though i wasn’t talking yes i
[11:43] i bleached my hair
[11:45] it was just a thing that i thought yeah
[11:48] let’s try it let’s see how it looks why
[11:50] not um
[11:51] pink or green or anything yeah my niece
[11:54] was my niece was like okay you should
[11:56] now make it pink
[11:58] but
[11:59] i tried i tried purpling it because it
[12:01] was very orange in the beginning
[12:03] and uh the purple just added pink to it
[12:06] which was okay but then i washed out so
[12:08] i wasn’t
[12:09] going after that anymore
[12:10] anyways yeah that’s uh interesting to do
[12:13] i think only my grandma had like some
[12:16] reservations but yeah
[12:18] anyways projects i mean it’s a project
[12:21] yourself should be a project of yourself
[12:23] so i think so what
[12:25] but yeah um
[12:27] i’m currently in america so that’s why
[12:29] um there’s still daylight here
[12:31] and uh this
[12:33] yeah means that i could only bring one
[12:35] or two projects with me
[12:37] i could probably have brought more of
[12:40] the smaller stuff anyways excuses um
[12:44] so
[12:45] one of the things that i brought with me
[12:47] is
[12:48] this little robot nice
[12:52] and i probably still have to work a lot
[12:55] on this and have so many revisions to do
[12:59] um there was one night where i was
[13:00] spending
[13:02] i think four
[13:04] hours i was up till four in the morning
[13:06] to get all these details correctly
[13:10] or i mean as close to screen accurate as
[13:12] you can get without taking any
[13:14] screenshots of disney anymore because
[13:16] that doesn’t work
[13:18] and you’re
[13:19] yeah just trying to find some
[13:21] screenshots that are
[13:23] well you can work from it but they’re
[13:25] very low resolution anyways um yeah i
[13:28] tried my best there and spent way too
[13:30] much time working on this instead of the
[13:32] electronics um
[13:35] but i had a plan
[13:36] to
[13:39] yeah work on the
[13:41] yeah i
[13:43] i told i said myself okay you definitely
[13:46] want
[13:47] the wings to move and
[13:49] there’s a little flaw
[13:51] i still have to design the hinges so it
[13:54] actually works but the hinges are so big
[13:57] that they are
[13:58] resting
[13:59] on the servo mount so
[14:01] they’re really close up and this is only
[14:03] the fourth or fifth iteration of the
[14:06] shell
[14:07] uh yeah so
[14:08] it’s all a bit fiddly um
[14:11] and also when i redesigned this in the
[14:13] night the angle of the wings don’t match
[14:16] the angle of the servos anymore so i
[14:18] have to at least reprint this version
[14:20] again where i fixed the circles and
[14:22] since i moved the servos everything
[14:24] shifted so i’m not sure if everything
[14:26] fits back in again so yeah this this
[14:30] 3d printing machine as well so that’s
[14:32] something you’re printing yes and
[14:35] this
[14:36] i mean if you print it like this you
[14:38] don’t really get a good resolution on
[14:40] the top so what i did was i cut it in
[14:42] half and then just printed it like this
[14:45] interesting
[14:47] so you guys
[14:48] see the seam yeah but it’s not yeah good
[14:50] enough oops details but yeah it gets a
[14:53] bit choppy on the top but
[14:55] better than printing it like this
[14:58] not faster but definitely more
[15:00] resolution
[15:02] and
[15:03] yeah so the other thing that i wanted to
[15:05] have is that
[15:07] it can rotate
[15:09] in your
[15:10] hands and
[15:12] so so that’s the third servo in the
[15:15] middle
[15:16] and also there are cut outs so the
[15:19] several thingies can go back in the case
[15:22] and i wanted to to be able to wiggle in
[15:25] your hands so you can use the same servo
[15:28] for the wings
[15:29] also for moving in your hand
[15:32] nice and
[15:33] and once i
[15:35] uh yeah there’s somebody else on twitter
[15:38] uh sulfuroid who’s working on the flying
[15:40] version really yeah for me this is just
[15:42] the prop thing that you hold in your
[15:44] hands it’s a
[15:45] yeah i think that’s
[15:47] that’s enough on my plate already and um
[15:50] yeah i can
[15:52] i probably have some
[15:55] power left yes
[15:57] so
[15:58] there’s also a display on it
[16:00] that’s a 240 by 240 pixel round oled
[16:04] thingy um
[16:06] there’s a bunch of letters that you
[16:08] could google it with but
[16:10] yeah i think you probably know what i
[16:12] mean and then there’s this neopixel
[16:15] um that can
[16:21] yeah shine through this little
[16:24] glass thingy
[16:26] yeah
[16:27] and we’ll do a holographic projector
[16:29] will that be part of the build
[16:31] yeah i mean if you do a little cut out
[16:34] and then if you can lift with the shapes
[16:36] of layer then
[16:37] that could work
[16:39] uh but yeah other than that i’m just
[16:42] happy with moving wings and rotation and
[16:45] maybe wiggling in your hand
[16:49] when do you how long do you think wow
[16:50] how far off finishing are you do you
[16:52] think
[16:53] uh between
[16:55] one and three months i guess i have no
[16:57] idea
[16:58] i still have to work out um the
[17:00] animation for the eye and um yeah just
[17:04] generic animations running on them that
[17:07] takes a bit probably maybe it’s just an
[17:10] hour and then everything in the code
[17:11] works to my liking but then i still have
[17:14] to find um
[17:15] some time to work on the mechanical bits
[17:17] but yeah
[17:19] and will you um
[17:20] will you put the designs up on them are
[17:22] they open source on github or will you
[17:24] be would you be deleting it
[17:26] yeah so so once i’m happy with it take
[17:28] you down
[17:30] no no oh um i i yeah it’s a
[17:34] tripoli slope if you want to sell
[17:36] something that’s uh destiny owned so
[17:38] don’t do that
[17:40] um
[17:41] i might share the design files but if
[17:43] you want to print
[17:44] a lola
[17:47] uh then you can definitely do that
[17:49] already because there are plenty of
[17:51] files out there yeah i’ve i’ve seen one
[17:53] where you can put in your fingers and
[17:55] then you can um move the wings
[17:58] with some movement so it looks like it’s
[18:00] moving in your hand that’s pretty cool
[18:02] that’s great
[18:04] yeah
[18:05] and the little other thing that i
[18:08] brought here that i can’t really use or
[18:10] i’m afraid to um
[18:12] start programming on this this little
[18:14] thing here
[18:15] wow
[18:17] that’s the
[18:18] that’s the imme um
[18:21] messenger um
[18:23] those are hard to come by very hard to
[18:25] come by
[18:26] well unless unless you don’t care if you
[18:28] and that you pay 200 to 300 dollars for
[18:32] it or euros vice versa now
[18:34] it’s yeah well but i was lucky enough to
[18:37] find one uh in spain for
[18:39] 60 euros about
[18:41] and
[18:42] yeah and yesterday i was just browsing
[18:45] for fun and
[18:46] stumbled over a website i’ve never seen
[18:48] before and
[18:49] somebody was selling one on there so i
[18:52] might have one another one coming here
[18:55] so i got to yay
[18:57] but
[18:59] uh when you want to start programming
[19:00] them you always stumble over this
[19:03] sentence where it says just connect your
[19:05] good fat to it
[19:07] and a good fit
[19:09] is something you can’t really buy
[19:11] anymore um this is a jtag debugger tool
[19:14] that you pla connect and can connect
[19:16] stuff to and then you can also bid bang
[19:19] i square c and spi with it
[19:22] but well you can’t really get it anymore
[19:24] the chip on itself
[19:26] costs 17 euros now
[19:28] uh when you can find it because ship
[19:30] shortage of course
[19:32] and
[19:33] yeah so um
[19:35] if you can’t really buy one you probably
[19:38] just think oh well
[19:40] i can
[19:41] quickly
[19:42] start kaiket
[19:44] yep and yeah so this is after i think
[19:48] two days of designing because um i got
[19:50] the chip but they already and they also
[19:52] used the ftdi
[19:54] um serial converter and used the voltage
[19:57] converter
[19:59] yep that’s my timer
[20:00] anyway
[20:03] they use the voltage converter of this
[20:04] and also use be mini so i thought okay i
[20:08] might slap on some new parts and some
[20:09] good parts and then i can power much
[20:11] more with that and
[20:12] debug and start programming this so yeah
[20:16] that’s
[20:17] my
[20:18] month so far all right cool good great
[20:22] okay well should we try and keep to the
[20:24] time with it we can’t be very relaxed
[20:25] about this we don’t need to stick to the
[20:27] timer but let’s say it’ll be in first
[20:31] we get sick to the time all right i i i
[20:34] said everything that i wanted so i’m
[20:35] happy about this stay on target that’s
[20:38] the absolute okay
[20:40] brayden are you ready to
[20:42] take your turn on the show yeah yeah
[20:44] it’s everything
[20:47] no i continue to break things but that’s
[20:49] that’s actually part of my job
[20:50] description i think these days
[20:53] so um
[20:55] i started playing around with a couple
[20:57] of actually it’s good that david’s on
[20:59] this call because um the clock you see
[21:02] in front of you is actually an offshoot
[21:03] of a
[21:04] a challenge that happened
[21:07] almost two years ago now on what on
[21:10] on
[21:12] brian’s channel so we got on this
[21:15] conversation about creating a giant size
[21:17] seven segment display
[21:20] and i built one that was just
[21:22] under three meters tall
[21:24] um but if you’re gonna have a seven
[21:25] segment you have to have a dot at the in
[21:28] the lower corner and so i created a dot
[21:30] in the lower corner
[21:32] and it was
[21:34] um converting from english to metric
[21:36] again um it was 14 inches across so
[21:38] that’s uh
[21:41] 350
[21:42] 35 centimeters across
[21:45] um and it was kind of cool but it wasn’t
[21:47] really functional and i kind of thought
[21:48] that would be kind of neat if i could
[21:49] get that dot onto my desktop
[21:52] so
[21:54] this version is about a hundred
[21:57] millimeters across 10 centimeters across
[22:01] and um
[22:02] i then said well it’d be nice if this
[22:04] were easily customizable by other people
[22:08] um and so instead of making it only run
[22:11] like an arduino
[22:12] it’s got an esp32 on the back i’ll show
[22:14] you in a moment but instead of running
[22:15] just sort of you know the arduino ide
[22:17] and stuff
[22:18] i chose an esp32 s2
[22:22] that is already approved for running
[22:24] circuit python so this is actually
[22:26] running circuit python which makes it
[22:28] really easy for people to change code
[22:32] and it comes with a i provide a library
[22:36] that gives you all sort of the timing
[22:37] related functions for it
[22:42] now i do keep
[22:43] messing up my computer and see if this
[22:45] works
[22:47] but it can run any circuit python so
[22:49] this is actually an adafruit demo
[22:51] i’m going to take the diffuser off of it
[22:53] for a moment so it’s going to now you
[22:54] can actually see the individual leds
[22:57] there’s
[22:58] 240 leds that make up the outer ring
[23:02] there’s another 70 leds in the middle as
[23:05] a pair of
[23:06] 5x7s um and so and it’s got a pair of
[23:10] buttons at the top
[23:12] and it also has a set of jumpers so if
[23:13] you want to put like really big arcade
[23:15] buttons on it and put this in a case you
[23:16] could do that too um
[23:23] really nice yeah and um
[23:26] let’s see
[23:28] i’ve got a couple other really quick
[23:30] demos i can do here um
[23:32] [Music]
[23:33] and did you uh hand solder these as well
[23:36] oh god no no no with 310
[23:38] [Laughter]
[23:40] what are they they’re the two millimeter
[23:43] by two millimeter leds i’m not going any
[23:45] smaller than that at the moment but um
[23:48] let me see there’s another demo really
[23:50] quick um
[23:51] [Music]
[23:53] next let me see which one it is there’s
[23:55] a couple of useful ones uh and all the
[23:56] code is open source and it’s out on on
[23:59] git lab
[24:00] um and so when somebody gets one of
[24:01] these
[24:02] they get the url to everything and it’s
[24:05] also i’ve been tweeting about it quite a
[24:06] bit um
[24:09] let’s see
[24:13] um
[24:14] one of the one of the interesting ones i
[24:15] created is a chess timer so that’s the
[24:18] the clock with the two buttons on top
[24:21] and so you set you set your time like
[24:22] for instance a chess match might be 20
[24:24] minutes per per player
[24:26] and when one player hits a button
[24:28] it’ll start counting and then when they
[24:30] when they’re done it starts the other
[24:32] the other players clock and it goes back
[24:33] and forth you normally see it as two
[24:35] dials on an analog but um i did it as a
[24:37] digital version here
[24:39] um and then because it’s got five by
[24:42] seven in here you can actually do
[24:44] you know a full font of characters and
[24:46] numbers
[24:47] so there’s uh
[24:49] i think i’ve got a little glyph test
[24:51] here
[24:54] let’s see if this is correct we’ll find
[24:56] out in a second yeah so
[25:00] you know a whole set of glyphs are
[25:02] available
[25:04] the full library is available
[25:10] you can go up and down and stuff like
[25:11] that
[25:13] and so now if i
[25:14] swing the light over here hopefully
[25:17] and turn
[25:20] my video gain up a little bit i can
[25:22] actually show you the internals of this
[25:24] let’s see if this works
[25:28] there we go
[25:30] so let me unplug it
[25:32] so uh you can kind of get an idea of the
[25:34] size of it here
[25:36] like i said this started out as a 35
[25:38] centimeter
[25:39] circle
[25:41] and it didn’t have the section in the
[25:42] middle uh no a machine places all the
[25:44] parts on this there’s 400 parts on this
[25:47] board
[25:48] as you see right here between all the
[25:50] capacitors and a couple of resistors
[25:52] on the back there’s a little buzzer
[25:55] there’s a little audio amplifier chip on
[25:57] the front
[25:58] um
[25:59] and as i was saying before there’s a
[26:00] pair of buttons here but then there’s
[26:01] also a standard set of of headers that
[26:03] you can jump out and then this is a if
[26:06] anybody is interested in doing circuit
[26:08] python this is a really affordable esp32
[26:11] s2
[26:12] with a lot of gpio pins to play with
[26:15] um
[26:17] and so that’s the one i’m using there
[26:19] um
[26:20] and so this is the the loomis ring the
[26:22] other part of that competition
[26:24] is
[26:25] coming back from manufacturing right now
[26:28] which is um this is you can get an idea
[26:30] of the size this is
[26:32] 280 leds
[26:35] it’s seven across by
[26:37] somebody can do the math real quick
[26:39] um
[26:41] and
[26:43] this represents
[26:45] this represents the seven across by 40
[26:47] high this represents the the bars of the
[26:50] original seven segment display
[26:53] so i i played around by taking the the
[26:55] segments off and stacking them all side
[26:57] by side and i did some really cool
[26:58] animations
[27:00] and again i thought er it’s kind of big
[27:02] it’s not very useful let’s make it
[27:03] really small
[27:04] so this can do animations this way but
[27:07] then you could also
[27:09] do scrolling text and there’s enough
[27:11] leds to do
[27:12] two digits a colon two digits a colon in
[27:14] two digits so you can do a clock with it
[27:16] there’s a bunch of things you do it and
[27:18] it will use the same
[27:19] esp32 s2 that i’ve got here
[27:23] and so um because they’re all running
[27:25] circuit python and you can also program
[27:27] them with arduino
[27:29] they’re really easy for people to get
[27:31] involved and play with and stuff
[27:33] the other circuit python project i
[27:34] created so what is your max frame rate
[27:37] with so many leds um
[27:40] it depends on how many leds you’re
[27:42] updating each time
[27:43] with and it also depends with circuit
[27:45] python you’re going to be slower with
[27:49] the arduino code
[27:51] i know somebody’s doing
[27:53] replace you know basically updating
[27:55] every single led at 60 frames a second
[27:58] um i have a demo that will that does the
[28:00] clock and there’s a
[28:02] and there’s a what i call a sweep second
[28:04] so this led up here updates 60 times a
[28:08] second
[28:09] so i can update part of the display
[28:12] um
[28:13] but that’s an arduino thing not a not a
[28:17] ws2812 problem
[28:20] i mean that’s yeah it’s a circuit python
[28:22] thing the other project i created and i
[28:23] originally created it because i needed a
[28:26] controller for my pick and place machine
[28:28] but it also works great as a controller
[28:30] for a cnc machine
[28:31] um it can be
[28:33] a pad for doing streaming etc
[28:36] it’s a full numeric keypad so here’s the
[28:40] here it is inside a case
[28:42] um
[28:43] and
[28:44] it can be set up that this ends up being
[28:46] a mouse and you’ve got mouse buttons
[28:48] here
[28:49] if you press this button and move this
[28:51] it’s a scroll wheel and if you do that
[28:53] it changes the acceleration of your
[28:54] mouse
[28:55] um and you can reprogram these they
[28:57] don’t have to uh you can get just plain
[28:59] key caps these are standard keycaps you
[29:00] can make them any you know set up any
[29:03] way you want um i wanted a numeric set
[29:06] um but like right now the demo on this
[29:08] thing
[29:09] you probably can’t hear it is uh
[29:14] it’s just little musical notes um
[29:16] because i realized that if i did a demo
[29:18] and it was hooked up to my computer as a
[29:20] keypad i was going to start changing
[29:22] windows
[29:26] now again i’m using circuit python
[29:28] because it makes it really easy for
[29:29] people to do customization on it
[29:32] and in this case i’m using
[29:34] the raspberry pi pico
[29:37] [Music]
[29:38] which is incredibly inexpensive that’s a
[29:40] four dollar board so all that capability
[29:42] is for four dollars um and then it’s
[29:45] standard
[29:46] mx keys and this is uh the joystick off
[29:50] of a standard game controller like an
[29:51] xbox
[29:53] um and again it’s got a little oled
[29:54] display and you can set up the text i
[29:56] always set this up so that it shows me
[29:58] what these keys are
[30:00] and it also has a
[30:01] little buzzer speaker right there
[30:04] so
[30:05] i’ve been specifically choosing circuit
[30:06] python for these projects because
[30:09] they’re targeted at at
[30:12] other people doing customization on them
[30:14] and so it’s easier for them to have
[30:16] circuit python as an option
[30:18] as opposed to forcing them into the
[30:20] arduino ide but they’re welcome to do
[30:22] the arduino ide as well because
[30:24] one’s a
[30:25] you know one’s a raspberry pi pico and
[30:28] the other one is an esp32 which are both
[30:31] easy to do
[30:33] nice
[30:34] that’s really cool
[30:37] with the chip shortage review
[30:40] in plentiful display display
[30:42] supply so you can get leds no problem
[30:45] the led yeah the leds um
[30:47] i’ve purchased at this point
[30:50] uh 20 000
[30:52] um
[30:54] about halfway through those um
[30:57] and surprisingly enough the
[30:59] let me move this over so it’s in a
[31:00] little better light
[31:02] this esp32 s2
[31:05] um
[31:06] is
[31:07] readily available
[31:09] this whole board um and actually
[31:11] i was surprised the price of the board’s
[31:13] actually gone down in the past two
[31:15] months
[31:17] hmm interesting
[31:18] um
[31:19] and so that’s that’s why i chose that
[31:21] one plus it has a lot of a lot of pins
[31:23] and so i use a handful of them
[31:26] um
[31:27] especially on this one i had to i needed
[31:28] a bunch of pins but
[31:31] i also leave a bunch of pins for the end
[31:32] user so if they want to do some
[31:34] customization or add some functionality
[31:36] they can do that
[31:37] and so um
[31:39] what esp32 chip the date recently
[31:42] canceled was it the es2 it was ds3 one
[31:45] of them was buggy and
[31:46] well the s3
[31:49] has had some issues but i haven’t seen
[31:50] that it’s been i think there’s there’s
[31:52] versions of them like there’s multiple
[31:55] instances of an s3 chip
[31:58] um
[31:59] and so i don’t know which one
[32:01] uh has been affected lately
[32:03] uh i actually i have some s3s on another
[32:06] project that i’m working on but um
[32:09] board what’s the the purple one you’re
[32:11] using does it have a name or is that
[32:13] kind of generic
[32:14] uh
[32:15] so it’s it’s i think it’s called the
[32:17] esp32 s2 mini
[32:20] okay
[32:21] um
[32:22] i mean i’ll be honest uh
[32:24] the first batch i paid four dollars a
[32:26] piece for i’m now paying three dollars a
[32:28] piece for them they’re incredibly
[32:29] inexpensive i’m stunned
[32:31] i’m stunned
[32:32] i mean i’m i’m paying more for the
[32:34] little just this little oled display
[32:36] that i have for that whole board
[32:40] yeah it is crazy
[32:42] yeah um but yeah so circuit python was
[32:45] specifically because i wanted these to
[32:46] be easy to be configured and customized
[32:48] by end users
[32:50] um and it’s it’s it’s been a really
[32:52] a big help to make that because you know
[32:55] you can change code
[32:56] if you’re at all familiar with circuit
[32:58] python you know literally you just copy
[33:00] a file to
[33:02] when you plug one of these devices in it
[33:03] shows up as a
[33:05] a little device drive a little usb drive
[33:07] and you literally just drag and drop or
[33:09] copy
[33:10] your file to it and it
[33:12] immediately restarts with the new code
[33:15] yeah nice
[33:17] all right that was a 10 minute timer
[33:19] dave’s clacking the whip
[33:23] um
[33:25] accidentally
[33:26] that’s all right i knew i was i was at
[33:28] the edge anyways
[33:31] okay so what have i been up to well
[33:33] actually interestingly
[33:35] you guys just mentioned um
[33:37] some seven segment leds so i’ve been
[33:39] messing around with some
[33:41] seven seven leds as well so let me just
[33:42] try and power this up and let’s see if
[33:45] it starts up
[33:49] so
[33:51] looking much brighter on the actual
[33:53] camera because this camera’s not got
[33:54] very good um doesn’t really handle
[33:56] bright lights
[33:57] but uh
[33:58] these are led filaments each one’s about
[34:00] kind of um 69 millimeters so not quite
[34:04] as big as the ones you made nice
[34:06] they work really nicely so i started off
[34:08] with this let me try and
[34:10] put on the balls
[34:12] yeah
[34:13] so the first board i made
[34:15] was this very big pcb
[34:18] and um the problem with that is i mean
[34:20] it’s it’s not that massive but it gets
[34:22] quite expensive when you start making
[34:24] big pcbs especially how much did you pay
[34:26] for it
[34:27] um i can’t actually remember what it
[34:29] cost
[34:31] usual five dollars though that you get
[34:33] so yeah there’s small ones and there’s
[34:35] loads of wasted space so there’s big
[34:37] blank spaces
[34:40] but it was kind of sort of
[34:43] bonkers so that made these sort of more
[34:45] modular ones which are a lot smaller
[34:48] but um and they were much cheaper
[34:51] but then all the connectors i think
[34:53] added up to probably more than the balls
[34:55] cost plus shipping once you start buying
[34:57] loads of connectors and ribbon cables
[35:00] uh and
[35:01] terminals it gets a bit silly
[35:03] um but it doesn’t mean i can now put
[35:05] more of them together so i’ve got more
[35:07] pcbs on order these um these kind of x
[35:10] kind of shape boards
[35:11] i’ve got another 10 of them on order so
[35:14] i will daisy chain another kind of six
[35:16] boards on the end and have quite a large
[35:18] display
[35:19] um
[35:20] so that’s quite fun and interesting it
[35:22] does draw an awful lot currently i’m not
[35:24] doing any multiplexing so it’s driving
[35:27] it’s just driving the segments all at
[35:29] once and with these really neat
[35:32] power shift registers and the ones i’ve
[35:34] currently got
[35:35] allegedly can sink 350 milliamps per
[35:38] channel and there’s eight channels on
[35:40] each chip
[35:41] so
[35:42] in theory you can sing an awful lot of
[35:44] current through one one tiny little
[35:46] little chip so i can run all the leds at
[35:48] once but um
[35:50] with these four four digits of all the
[35:52] segments lit that’s about
[35:55] six point now is it 6.2 amps or
[35:57] something
[35:58] um
[36:00] it’s going to be about 16 amps
[36:02] um
[36:03] the power supply i’ve got is quite beefy
[36:05] i think it goes up to 10 amps so that
[36:07] might
[36:08] be okay i can power it from both ends
[36:11] but um
[36:12] i’m starting to wonder if maybe i might
[36:14] make the wrong choice with my leds at
[36:17] once um so
[36:19] can you see them or read them at this
[36:22] brightness or and it’s much it’s much
[36:25] less bright when you look at it in
[36:26] person so the camera is getting slightly
[36:29] swamped and it’s not adjusting itself
[36:30] very well and so they are readable i
[36:33] mean you wouldn’t
[36:34] you wouldn’t want to look at them for
[36:35] too long that’s for sure
[36:37] it’s definitely not a thing you’d stare
[36:39] at i mean i think those elements aren’t
[36:41] really aimed at kind of light bulbs and
[36:44] replacement light bulbs so they are
[36:47] they are slightly too bright um so i
[36:49] might swap my resistors for slightly
[36:51] higher value ones and turn it down
[36:54] slightly or just pwm the enable signal
[36:57] so that it’s not quite as bright
[37:00] i kind of thought it’d be nice to have
[37:01] it as bright as possible when i was
[37:02] building it
[37:04] and then
[37:05] when i built it and turned it on i
[37:06] realized that was probably a bit silly
[37:08] and
[37:09] maybe going for maximum brightness
[37:11] wasn’t the right thing
[37:13] so chris
[37:14] we’re looking at a text sticker right
[37:16] it’s not like a framework problem yeah i
[37:18] mean it should be saying make a cast
[37:22] like subscribe bell
[37:27] i mean the problem is is it’s a seven
[37:29] segment font so it’s hard you have to
[37:31] use your imagination to actually read
[37:33] the words that’s
[37:35] definitely um
[37:37] definitely easier to read
[37:39] maybe i’ll have some more and maybe
[37:40] build some um
[37:42] put some more segments in going across
[37:44] so you can do more more interesting text
[37:46] but that’s saying that yeah that’s the
[37:48] phone with the seven segment display
[37:50] which i’ve been
[37:52] spending an enormous amount of time
[37:54] doing and it’s gone through several
[37:56] mistakes why ordered the wrong parts and
[37:58] the wrong chips
[37:59] which was um
[38:00] confusing
[38:02] um do you have like any um gem jars in
[38:06] mind uh that you wanna put over it yeah
[38:09] i’ve certainly been thinking about that
[38:10] some nice polished wood and some jam
[38:12] jars i think we’ve made these made these
[38:14] really nice
[38:15] so
[38:16] it’s um it’s kind of got slightly out of
[38:18] hand now and
[38:20] yeah
[38:22] i mean
[38:23] you always budget when you do it and
[38:25] then you think no oh i should stop doing
[38:26] this at some point this is a bit silly
[38:29] i
[38:29] i i mean i was in the same position i um
[38:32] when i showed the nixie tube thingies
[38:34] with the little jam jars
[38:37] it started with my mom giving me four
[38:39] little jam jars and then
[38:41] i found out what jam
[38:44] company this is and then i bought
[38:47] 60 of them because i thought i’m totally
[38:50] gonna sell them
[38:52] and
[38:53] yeah i haven’t so far this project is
[38:55] five years old i guess so
[38:58] i just have them in a drawer 60 empty
[39:01] glasses of almond meat or jam but yeah
[39:04] they were they were tasty but i have in
[39:05] a bag full of um 30 of these led
[39:08] filaments that yeah
[39:10] thinking i’ll make lots of these maybe
[39:12] i’ll make a big calculator maybe i’ll do
[39:14] that
[39:15] now i’ve got a big box full of bits and
[39:17] bobs that i’m starting to think i should
[39:19] move on to another project um
[39:21] by my character it’s kind of fun
[39:23] uh then the other thing i’ve been
[39:25] playing around with um
[39:29] i’ve been watching a lot of them big
[39:31] clive videos
[39:32] and seeing him salvage um
[39:35] lithium polymer cells
[39:37] and i’ve been wandering around my eyes
[39:39] peeled and i finally managed to score
[39:41] a couple of little sales so
[39:44] this one i thought might have been run
[39:46] over so this one was a bit
[39:48] i thought it was squash to begin but i
[39:49] think they actually come in this shape
[39:52] um and it does hold a charge and it
[39:54] charges up but it’s a 550 milliamp hour
[39:56] so
[39:57] this other one that seems in slightly
[39:59] better condition this actually had its
[40:00] um container and looked okay this one’s
[40:03] a 500 milliamp hour
[40:05] and so i bought this um this battery
[40:07] tester to try them out and just see
[40:10] see how well they work so this one’s
[40:12] slightly flat but this battery tester
[40:14] works quite well
[40:15] and then i started thinking well
[40:17] actually i wonder what this battery
[40:18] tester is actually doing and i thought
[40:20] all it’s really doing is measuring the
[40:22] voltage and discharging it through this
[40:24] big power resistor
[40:26] and i’ve got a bunch of esp32s with
[40:29] displays
[40:30] that’s got a an adc so then i thought
[40:32] i’ll just build my own um so now i’ve
[40:35] got my own battery tester obviously with
[40:37] esp32
[40:38] and it’s um
[40:40] terribly inaccurate adc
[40:43] this um produces an approximate result
[40:46] but it’s probably good enough for
[40:47] testing batteries and it’s quite a fun
[40:49] little
[40:50] little circuit to build so all it’s got
[40:52] is a
[40:53] voltage divider defeating the adc
[40:55] because obviously the esp32 is a 3.3
[40:57] volt device so
[40:59] i’m just halving the voltage and then
[41:01] there’s a power mosfet that turns on
[41:03] this transistor and drains the battery
[41:06] they do get quite warm after a while
[41:07] which is quite quite fun
[41:09] but um
[41:10] yeah so that’s a
[41:12] interesting battery fires um initially i
[41:15] just put them in one of them
[41:17] on big clives and metal dishes just in
[41:19] case it blew up but uh so far there have
[41:22] been no fires and they seem to charge
[41:25] and hold their charge
[41:26] so if you find any devices abandoned on
[41:28] the street there’s a lot of them
[41:29] nowadays because they’re all disposable
[41:31] then you can pick up some really nice
[41:33] cells and obviously there’s no battery
[41:35] protection on these so i have bought
[41:38] went on aliexpress and bought a bunch of
[41:40] these um
[41:41] projection pcbs
[41:43] but you can just solder onto the
[41:44] connectors and so i might make these
[41:47] batteries safe
[41:48] so i can
[41:49] use them in more projects
[41:51] i’ve got a charger pcb that does have
[41:53] battery protection on it but
[41:55] i kind of like to use the cells in
[41:57] random projects
[41:59] i’ll try and make them a bit safer
[42:02] hopefully i’ll find some more i’ve only
[42:04] found two so far which is disappointing
[42:05] other people seem to find them all the
[42:06] time i think it’s kind of like
[42:08] finding money in the street and some
[42:10] people are very lucky other people just
[42:12] find any
[42:14] but yeah i
[42:30] i’m not sure if they’re even legal in
[42:31] germany i think they are but i haven’t
[42:33] seen any on the street laying around
[42:35] yeah yeah i mean it is it’s terrible
[42:37] that their disposable devices it is and
[42:41] scary it’s like a
[42:42] tiny bomb basically
[42:46] when i was um when i was cutting all the
[42:48] bits off this one it was
[42:50] absolutely disgusting
[42:52] but i cut through the um
[42:55] the two wires that connected to the
[42:57] atomizer
[42:58] and it puffed out a whole bunch of smoke
[43:00] and i really thought that i’d blown up
[43:03] the um the cell and i was gonna have to
[43:04] run out of the house but unfortunately
[43:06] it was just um
[43:08] its final sort of death phrase of
[43:10] blowing out some
[43:25] so far
[43:27] i mean
[43:28] nobody flinched when i brought this in
[43:30] and there’s a lipo in there so
[43:32] yeah i think it’s fine nowadays isn’t it
[43:35] and your friends come in actually if
[43:36] everyone carries their phone so
[43:39] it’s just probably all the random wires
[43:40] might might scare the airport more than
[43:42] that
[43:44] yeah
[43:46] so yes that’s what i’ve been up to lots
[43:48] of uh lots of fun with lead filaments
[43:50] and then messing around with batteries
[43:52] and trying not to blow myself up
[43:56] entertaining
[43:57] dave i got a q i got a question for you
[43:59] do you know what uh frequency those imes
[44:04] messaging devices work on
[44:06] um
[44:07] there’s a c one one one zero cc one one
[44:11] one zero in there and that can talk i
[44:14] think for 30 minutes
[44:15] yeah yeah but but also um it’s a big
[44:18] range
[44:19] around four thirty three and then also 8
[44:21] 15 and i think 315 as well so you can
[44:25] get a spectrum analyzer on a really big
[44:28] broadband
[44:29] thing
[44:30] going so yeah that’s
[44:32] it’s a pretty decent tool and um there
[44:34] was a guy named sami kamkar who did a
[44:38] um sesame open thingy for
[44:41] um garage doors that have this just this
[44:43] one none just this password that sticks
[44:47] that way so it was just sending a line
[44:50] of numbers
[44:51] uh that was designed so that he can just
[44:54] send it and then there’s so much
[44:56] permutation in there um that he can
[44:59] yeah open the any garage door in 15
[45:02] seconds i think wow with this little
[45:04] pink pager oh funny and
[45:08] yeah so so whenever i got my good fat
[45:10] together and
[45:12] i still find it interesting enough then
[45:15] i hopefully can get into programming
[45:17] something for it and
[45:19] i mean it would be nice to adapt a
[45:22] recent hack with those 433 megahertz
[45:25] devices
[45:26] um
[45:28] to get the tesla charging ports open
[45:31] with it because you can
[45:33] you can just use an um
[45:35] one dollar arduino in the one dollar 433
[45:38] megahertz thing and then just send out
[45:40] this command and it works for all the
[45:42] teslas apparently because they didn’t
[45:45] care enough and
[45:47] the charging the charging adapter just
[45:49] sends it and whatever is close opens its
[45:51] ports
[45:52] so
[45:53] i i don’t know much more about it um i i
[45:56] don’t know if it works when the car is
[45:57] driving
[45:59] i don’t know if it works when it just
[46:00] sits there
[46:02] on a signal on a traffic light
[46:04] so yeah the only demo i’ve seen of that
[46:07] is um
[46:09] i don’t know if people have seen the
[46:11] flipper one
[46:12] the yeah it was a kickstarter or crowd
[46:15] supply something and now there’s
[46:17] thousands of them out in the wild um but
[46:19] it can send
[46:21] uh you know
[46:22] data messages on various frequencies and
[46:25] somebody sat around and basically just
[46:27] started aiming it at tesla’s opening up
[46:28] all the power charging ports
[46:31] [Music]
[46:32] i was asking because in the united
[46:34] states one of the things that’s prolific
[46:36] on ebay are these little smart response
[46:39] xe devices
[46:41] um and they’re running the
[46:43] atmega128
[46:45] rfa one chip
[46:47] which
[46:48] the only real claim to fame on it other
[46:50] than it being 128k of flash memory
[46:54] is uh it’s got a 2.4 gigahertz
[46:56] transceiver built into it
[46:59] um
[47:00] and so um
[47:02] i ended up writing up a complete display
[47:05] library
[47:06] test suite for the whole thing um and
[47:09] posted it out and then
[47:11] i built an enigma machine into these
[47:14] nice
[47:15] so um
[47:17] if you configure two of them with the
[47:19] same
[47:20] router settings and ring values and et
[47:24] cetera et cetera
[47:25] you send messages back and forth between
[47:28] two devices
[47:29] um over the 2.4 gigahertz transceiver
[47:33] um
[47:34] and so
[47:35] that’s that’s these are really easy to
[47:36] get in the united states
[47:39] the only the only problem was is almost
[47:41] all the listings on ebay for these where
[47:43] you can get them they say
[47:45] was working when removed from service
[47:48] well that was 2011 or 2012 and in most
[47:51] cases they left the batteries in them
[47:53] 10 years ago yeah and so i i bought a
[47:57] lot of these knowing that i was going to
[47:58] have a fair number of failures um
[48:02] but to dave’s point about having 60
[48:04] glass jars
[48:06] i think when i got i think when i got
[48:08] truly carried away i had 500 of these
[48:11] devices in a pile
[48:15] and
[48:15] 17 failure rate by the time i was all
[48:17] done fully smoke testing these things so
[48:20] i ended up with like 410 or 420 of them
[48:27] that’s brilliant i feel like i should
[48:29] have some as well i’m missing out
[48:32] so the nice thing about
[48:34] the nice thing okay the nice thing about
[48:36] these um i’ve got one over here that’s
[48:38] um
[48:40] turn the lighter leaders we can see it
[48:42] there we go so if you take the battery
[48:44] door off that’s all you have to do
[48:46] there’s a 10 pin header right there
[48:50] and that gives you access to
[48:53] isp
[48:55] plus four additional gpio pins
[49:00] and so um you don’t even have to crack
[49:02] open the case to reprogram these
[49:05] nice
[49:08] technically the same for this one but i
[49:10] had to solder on some wires because i
[49:12] thought i can
[49:13] easier work on this but yeah so i ended
[49:16] up designing i ended up just actually
[49:18] getting rid of this
[49:19] i ended up designing this little board
[49:22] which is
[49:23] i think it’s
[49:25] i think it’s not even 20 millimeters
[49:27] across and it’s about that long
[49:29] and it has these pogo pins in it so that
[49:32] you can just
[49:33] drop one of these in
[49:34] and then it’s got the isp connectors on
[49:36] it and then a set of leds to those four
[49:38] extra gpio pins
[49:40] and
[49:41] so i use one of the gpios i bit bang
[49:45] uh uart out so you can do debugging
[49:47] statements on it and stuff like that
[49:50] um and it’s really been it’s been handy
[49:53] um
[49:54] when i found out i had way too many of
[49:56] these things
[49:57] uh i just
[49:59] i went on i went on ebay i went well i
[50:01] went on ebay and found out well what’s
[50:02] the going price for them
[50:04] for people who are selling ones at a
[50:06] time and so i put together a bundle deal
[50:08] that’s
[50:09] two of these devices fully tested and
[50:11] guaranteed that they’re going to work
[50:13] plus this adapter for 25 bucks and they
[50:16] seem to be really popular and i think a
[50:18] lot of times people just want this one
[50:20] this is what they really want
[50:22] is the programming interface adapter but
[50:25] um i’m gradually working my way down i
[50:28] think i’ve gone through
[50:31] about 200 of the devices at this point
[50:34] i’ve sold
[50:35] so i’m slowly i’m slowly getting rid of
[50:36] my excess inventory
[50:44] the things we collect yeah i know
[50:47] so right are we ready for a quiz
[50:50] oh
[50:51] bring it on
[50:53] okay
[50:56] it’s the quiz brilliant
[50:58] what’s the prize you may ask
[51:01] what is the prize
[51:03] you’ll be crowned king or queen of the
[51:05] nerd for the remainder of the show
[51:11] 10 to 15 minutes left so that’s it
[51:14] that’s what you get uh if you want to
[51:16] play along at home the answers come
[51:18] after the questions so you just need to
[51:19] keep notes of which questions you got
[51:21] right or wrong and count up there’s only
[51:24] 10 questions
[51:25] so hopefully
[51:27] this won’t be too long and we’ll enjoy
[51:29] it
[51:29] sorry
[51:32] question
[51:33] i have to keep track of things what you
[51:36] track events
[51:38] i gotta write stuff down okay
[51:42] so you can keep a mental account
[51:43] someone’s already asked the question in
[51:45] the chat window so ignore the chat
[51:47] window we’ve just been talking about
[51:49] batteries or voltage should you charge a
[51:52] 3.7 lipo cell at is it 4.2 volts the
[51:56] meaning of life divided by 10
[51:58] 3.7 volts the clue is in the name
[52:01] 5 volts the only logical choice or 3.3
[52:05] volts this is actually the logical
[52:06] choice
[52:08] so
[52:09] i think now
[52:10] and
[52:11] you’ve written down your answers i will
[52:13] tell you what the correct answer is i
[52:15] think everyone i think everyone knows
[52:16] this
[52:17] maybe
[52:18] so 4.2 volts and here’s a little picture
[52:20] of what happens if you don’t do that
[52:24] okay
[52:25] next question
[52:27] more electronics
[52:28] everyone’s gone lead free because we all
[52:30] want to save the planet for what is sac
[52:33] 302 solder made of
[52:35] is it tin arsenic and copper
[52:38] is it tin aluminium and copper
[52:41] is it silicon tin and cadmium or is it
[52:44] tin silver and copper what is sac 302
[52:48] solder made of
[52:52] okay are we ready
[52:54] the answer is tin silver and copper
[52:58] so there we go everyone
[53:05] everyone’s trying to get into space but
[53:07] who went up first was it elon branson or
[53:11] bezos
[53:13] was it elon he drove his tesla into
[53:15] orbit
[53:16] was it
[53:17] he lost his galactic virginity oh what
[53:20] was it
[53:21] who took prime position
[53:23] um
[53:28] what’s your definition of space
[53:30] [Laughter]
[53:37] isn’t it it’s like 50 kilometers that’s
[53:39] the official you’re in space if you make
[53:41] it that high i think that’s what they
[53:43] decided the rules were
[53:45] oh god so many rich people i completely
[53:48] forgot
[53:49] okay
[53:50] it is
[53:51] friends and
[53:52] evenings
[53:53] yes why about a week i think this has
[53:55] followed him in his slightly
[53:57] entertainingly shaped rocket which i
[53:59] tried to find a nice picture of but it
[54:00] wasn’t too far away
[54:03] i’m thinking i’m not going with the easy
[54:05] one because that’s the wrong answer damn
[54:08] another space question which of the
[54:10] following spacecraft is furthest from
[54:12] earth
[54:13] is it voyager 2
[54:16] is it vega
[54:19] voyager 1
[54:20] or vanguard one which one is furthest
[54:24] away
[54:26] i just read this too
[54:28] [Laughter]
[54:31] okay it is voyager 1.
[54:35] tricky question do you think maybe it’s
[54:36] a trick question and it’s actually
[54:38] voyager 2 but it is voyager 1.
[54:40] i mean the other one has a head sorry
[54:42] but yeah
[54:44] if i recall if i recall correctly
[54:46] voyager 2 is going to pass voyager 1
[54:48] sometime
[54:51] because because of the way it was it
[54:53] ended up with a slingshot so even though
[54:54] it was later
[54:55] um it’s interesting it’s moving faster
[54:58] at this point in its life
[55:02] so we all know his name but what was the
[55:05] name of his ship
[55:06] oh i know that his name
[55:11] so was it the santa maria
[55:14] was it the bottom ebay
[55:16] is it nautilus or was it the nsea
[55:19] protector
[55:23] i feel like d is an inside joke that i
[55:25] could get
[55:29] there was an inside joke yes
[55:32] okay the answer is
[55:34] the botany bay that was his ship
[55:37] although this ship that’s shown in the
[55:38] video is what he stole from someone else
[55:43] okay
[55:47] okay
[55:49] who said the following
[55:51] the odds against us and the situation no
[55:53] the odds are against us and the
[55:54] situation is grim
[55:56] was it scotty
[55:58] kirk
[56:00] bones or spock
[56:02] who said the odds are against us and the
[56:04] situation is grim
[56:11] okay are you ready
[56:13] the answer is
[56:15] okay
[56:17] what happened mark you didn’t put spock
[56:19] did you
[56:20] no
[56:24] no that wouldn’t it would have been
[56:25] there would have been the the
[56:27] politically correct curse in there if it
[56:30] had been scotty
[56:33] damn it jim i’m a doctor
[56:36] okay famous geeks which famous physicist
[56:39] coined the term photon for particles of
[56:42] light was it albert einstein
[56:45] gilbert newton lewis
[56:47] isaac newton or enrico fermi
[56:53] yeah these are getting tough
[56:58] are you ready maybe you made your guess
[57:01] it was gilbert newton-lewis
[57:06] i think albert einstein proposed it and
[57:09] but newton named it okay
[57:12] history
[57:13] what was the original price of the apple
[57:15] one computer
[57:17] was it 500
[57:19] is it 99.99
[57:23] 666.66
[57:24] or one thousand dollars the original
[57:27] price of the apple one computer at
[57:30] retail
[57:31] store including the monitor
[57:34] uh i think it was just the pcb
[57:38] i actually think you’re right i don’t
[57:39] even think it had a case at that point i
[57:41] think it literally was the the the
[57:43] keyboard connected to the the main board
[57:46] oh
[57:47] so somebody else made that wooden case
[57:48] there
[57:52] these go for a lot of money nowadays if
[57:54] you if you have one in the attic
[57:56] bring it down and dust it off okay
[57:59] everybody
[58:01] it was
[58:02] six six six what
[58:04] because apparently they liked repeating
[58:07] numbers uh that’s about 3500 in today’s
[58:10] money so
[58:14] it’s kind of like a very high spec pc or
[58:16] an apple laptop yes
[58:19] yeah but it has a case is that for
[58:21] newsbeat social
[58:23] okay computer games
[58:25] what atari video game undersold so badly
[58:28] that millions of cartridges were crushed
[58:30] and buried in new mexico
[58:32] was it rambo
[58:34] zarkon’s exodus postman or et the
[58:38] extraterrestrial
[58:41] okay ready
[58:42] yeah of course et
[58:44] they dumped it all in mexico because it
[58:46] was so crap
[58:48] apparently people now understand it
[58:50] better and it plays better and they have
[58:53] a better idea they’ve fixed all the bugs
[58:54] haven’t they to make it playable
[58:57] yeah i think
[58:58] got a renaissance
[59:01] um okay
[59:04] round
[59:05] as of 2022 how many videos are on
[59:08] youtube is it
[59:10] 100 million
[59:12] yeah those are mine 500 million
[59:15] 800 million or one billion
[59:20] how many videos are on youtube
[59:24] are you ready
[59:26] it was actually 800 million
[59:28] how many you need to watch
[59:30] catch them all and i think that’s the
[59:33] that is the last question that was the
[59:35] quiz
[59:37] right
[59:38] how did we do
[59:39] dave what was your score did you lose
[59:41] trash
[59:43] i i lost track a bit i think but i think
[59:45] i got five points down
[59:48] mark what’s your what’s your score
[59:51] i got four points right
[59:56] right again how did you do i only got
[59:58] five oh tied with dave well you guys you
[60:02] get to wear the crown and sharing
[60:05] i’m the queen you can be the king
[60:10] how did the audience do oh dude the
[60:12] audience did pretty badly as well three
[60:15] five
[60:16] minus three
[60:19] really appalling oh dear well
[60:21] next quiz will have to be slightly
[60:22] easier then i will i’ll assign the quiz
[60:25] mastering to someone else’s it was
[60:28] definitely a good quest though i enjoyed
[60:30] it
[60:31] i thought your little videos made it
[60:33] made it better
[60:34] questions maybe not so much
[60:37] so that’s the end of the show so what
[60:39] should we do now okay
[60:43] we’re right on the top of the hour we
[60:45] are on the hour we’ve actually rained
[60:47] on nice i think that’s down today’s time
[60:50] keeping that is pretty impressive we
[60:52] have to keep that up
[60:54] we do have to keep that up yes
[60:56] so nice unless unless the audience wants
[60:58] to stick around we can we can call it a
[61:00] night and stop
[61:02] so yep i can hear i can hear people
[61:05] saying stop stop
[61:07] yeah
[61:10] okay thanks everyone
[61:12] it’s a great show i will
[61:14] end the broadcast
[61:16] now

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Chris Greening

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A collection of slightly mad projects, instructive/educational videos, and generally interesting stuff. Building projects around the Arduino and ESP32 platforms - we'll be exploring AI, Computer Vision, Audio, 3D Printing - it may get a bit eclectic...

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