I'm using the smart thermostat from https://www.smart-thermostat.eu. by R. Campos.
I designed a box to include the esp32 and the relay module. (Fusion 360)
Version 1 for the Smart Thermostat Relay Box
Extra options planned:
- Reset Button.
- Relay wire improvement
- Fine tune USB Connection.
- Battery powered version.
With 0.2mm print tolerance.
- relay module is from Keyes.
- ESP module is a cheap generic of Ebay.
- Mount not tested yet. Currently printing....