Grove PIR sensor

As you can see in this video, I've hooked up a simple program to change the colour of a strip of neopixels in response to detecting people passing by.



See example code here: https://github.com/swiftforarduino/community/tree/master/work%20in%20progress/Grove%20Examples/Neopixel%20person%20sensor.swift4a

But this is an easy project to write.

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