sudo vim /boot/config.tx

Append

dtoverlay=w1-gpio

sudo vim /etc/modules

Append

w1-gpio
w1-therm

sudo vim /etc/network/interfaces

Append

wireless-power off

To create the sqlite database, open the python3 shell and execute

from app import db
db.create_all()
exit()

cp fridge.servce /etc/systemd/system/
systemctl daemon-reload
systemctl default fridge
systemctl start fridge

The app provides no authentication on the API endpoints and should therefor be configured with a webserver with whitelisted IPs or similar.

Compressors have a starter motor that draw high currents in order to get things moving. When the compressor turns off, the pressure at the output is very high. Turning the compressor on again immediately will put a very high workload on the starter motor, thus lowering its lifetime. Instead, we should wait for the pressure to equalize inside the system.

From Targeting Refrigerators for Repair or Replacement

In other words, a typical, properly operating refrigerator
runs about 20 minutes and is off 20 minutes.

Over a span of 24 hours the compressor switched on 8 times, running 10-20 minutes each time. The temperature of the sensor taped to the fermentation chamber read between 16'C and 17'C.

When set to 6'C, the compressor switched on for 20 minutes and was off for approximately 35 minutes, in general.

We believe the sensor fluctuates more when taped to the chamber compared to being submerged in the chamber.