Improve wireless doorbell


Trandi posted a step by step guide of his DIY wireless doorbell build:

So this was the perfect pretext for a small electronics project, centred around the idea of a simple voltmeter that would notify us when the voltage goes below a safe level. This would most easily be done with a small micro controller that has an ADC.

For some reason I quickly decided that I also wanted the doorbell to count the rings, to be able to quickly see if we’ve missed anybody while away from home.

Check out the video after the break.

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