Fermentation Box

Fermentation box inspired by Noma Guide to Fermentation.

Materials:

• 1 insulated box (approx. 60x39x24 cm)
• 1 Raspberry pi 3b+
• 1 Raspberry pi power supply
• 1 DHT11 sensor
• 1 4 relay module (2PH63083A)
• 1 Heating mat
• 1 Humidifier
• 1 LCD display
• 2 fans, one for the fermentation box and one for cooling hardware box
• 1 USB B to USB micro cable (approx. 2m)
• Wires
• perforated baking tray (approx. 40x30 cm)
• 4 stands to lift the baking tray off the heating mat

To be implemented:

• More efficient control system -> It would be cool with a kalmanfilter or something!

Known issues that I do not know how to solve:

• The humidifier turns on and off with a pulse signal. Sometimes something failes during start up, such that the humidifier is out of sync. \n I think I should replace the humidifier with one that has a real on/off switch and not just a pulse.

Modify rc.local to run on start up:

1. On the Pi edit the rc.local file, which can be accessed using the following command:

sudo nano /etc/rc.local

2. Add the file to be executed at the bottom of the page, but before the exit 0 command. Here & is added at the end of the filename, as the script runs continously.

python3 /home/pi/FermentationBox/main.py &

3. Make sure file is executeable.

sudo chmod +x /etc/rc.local

4. Reboot system.

sudo reboot

Now the program should start.

Setup:

fritzing file also available. Be aware of the gpio pins. The numbering varies between the code and the fritzing sketch.