The core of the project is connecting the ESP32 to the intercom's terminals. The ESP32 uses an optocoupler to safely detect the ring signal (voltage) and two relays to "press" the door open button and ...
Step-by-Step Guide This manual breaks down the process of using your new 4 Wire Intercom Wiring Diagram into manageable steps for effortless operation. Before you start using your 4 Wire Intercom ...
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