[quickthrowman]

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?

[dmsayer]

i also have questions. was the fridge "smart"-capable prior to the esp32 mods and you just replaced the factory controller with your esp32 stuff, or youre saying you wired in the appropriate circuitry to replace the pressure-controlling thermostat with your esp32 stuff?

[qwertox]

it was not smart-capable. I was very lucky that the thermostat was in the fridge itself, above the compartments. There I removed the old analog control and had enough space to fit a USB power supply to the cables which were there connected to the now-removed analog control. I was lucky. The sent data gets stored in InfluxDB. So with Grafana it allows me to see when I opened it, because the temperature rises immediately.