He reasoned that he could tap into the low-voltage side of the doorbell transformer and watch for the telltale fluctuations that would indicate the bell was doing its thing. The ESP8266 has an ADC ...
The Family Handyman on MSN4mon
How To Wire a Second Doorbell ChimeA wired doorbell system has three components ... If you have a 15V transformer, you should replace it with one that supplies ...
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