Old fridge, ceramic heating element, temp controller, two computer fans: https://imgur.com/a/diy-temperature-controlled-fermentation-chamber-KuDFu11
Styrofoam box, humidifier, temp controller, humidity controller, perforated hotel pan: https://www.culinarycrush.biz/all/fermentation-chamber
Kitchen cupboard, reptile heating mat: https://www.americastestkitchen.com/articles/6855-diy-fermentation-chamber
Plastic box, microcontroller, heater, fan, OLED display: https://www.youtube.com/watch?v=tLW_WAPdoeg
- ESP32-C3 microcontroller (AliExpress, 2 EUR) or Arduino ⇒ works at 3.3 V
- OLED display to show temperature, humidity (AliExpress, 2 EUR)
- USB-C converter to output 12 V: to run fan and heater on more than 5V (AliExpress 2 EUR)
- 12V fan (AliExpress, 2 EUR)
- Step down voltage converter (AliExpress, 1 EUR)
- Silicone heating pad (AliExpress, 3 EUR)
- Input knobs
- DHT11 digital humidity and temperature sensor (AliExpress, 1 EUR) Apparently it’s not very reliable
- Mosfet transistor kit to control the heater and the fan, which are running on 9-12 V (AliExpress, 2 EUR)
Next iteration of microcontrolled tempeh-incubation chamber: https://www.youtube.com/watch?v=uAKlWe1nWns