I also really like electronics, so this page has various things related to...

Arduino:

Here are a couple of easy starter Arduino projects (there are more on the official site).

Fade LED with a knob

A push-button LED that fades on / off

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MAX/MSP/Jitter patches

note: these patches require the cv.jit libary by Jean-Marc Pelletier
basic motionSense object
some examples of using the motionSense object

basic faceDetection object

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GardenBot is a project I created.