These devices have key drawbacks. Water level indicators require manual pump operation and often waste power as multiple LEDs ...

One is charged with handling the mains power side of things. It carries an SPDT relay for switching AC power, and a DC power supply to run the ESP32 itself. The controller board holds the ...

Each reader node (input) provides (1) form C (SPDT) output relay for lock power switching, (1) dedicated request to exit input, (1) dedicated door position switch input, (2) auxiliary inputs, and (2) ...