When the doorbell rings, a message is sent to a private Telegram chat group.
Based on RaspBerryPi Zero and switching a GPIO via optocoupler through 12VAC from the doorbell, see wiring.png
When the doorbell rings, a message is sent to a private Telegram chat group.
Based on RaspBerryPi Zero and switching a GPIO via optocoupler through 12VAC from the doorbell, see wiring.png
