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| Created | January 20, 2022 |
| Last modified | January 20, 2022 |
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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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