This is awesome, great way to keep a fridge going! Temp sensor to ESP32, ESP32 monitors set point and calls for cool, output from ESP32 energizes relay coil which turns on the compressor?

> A new one would be more efficient, but then I woudln't be able to log when I opened the fridge anymore (only with something battery powered and long transmit intervals).

Also, how did you do this? Wiring to the door switch itself or a current switch around the fridge light conductor?