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Golmar Aux Bell GPIO simulator PUBLIC

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Created January 20, 2022
Last modified January 20, 2022
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Description

After measuring what is happening in the Tekna Plus SE video doorbell, I assume there's a pull-up resistor for about 1.5K and an unknown transistor that provides an up signal while idle and goes down to 0v three times to indicate a doorbell signal. This circuits simulates it connected to a Raspberry Pi 3.3v GPIO.

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