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Saw an app that does this on the android platform so thought I ‘d give it a go on iPhone.

It measures your heart rate by looking at the changes in skin colour as the blood flows in. It’s only available on the iPhone 4 as it needs the flash in torch mode to work.

You can get it here - it’s free!

I’ll do a blog post soon on how it works. It’s surprisingly simple.

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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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