I WiFi enabled my fridge because the thermostat broke. So now an ESP32 with a dallas temperature sensor and a relay take care of that. The code on the ESP32 is smart enough to keep working if there is no internet (wasn't always like this, until it had to), but it still sends the temperature to the server for logging and the server can send it configuration commands or control the relay directly, as it was initially.
It was a great way to keep the fridge alive, the thermostat was already a replacement and it never worked properly, so that sometimes things were frozen, sometimes barely cold. ~24 years old. 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).
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?
qwertox|4 months ago
It was a great way to keep the fridge alive, the thermostat was already a replacement and it never worked properly, so that sometimes things were frozen, sometimes barely cold. ~24 years old. 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).
quickthrowman|4 months ago
> 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?