A brewing temperatur controller:
Reads the temperatur from the sensors, turns on/off the heating element to reach the target temperatur
Based on this links I built a simple brewing machine:
https://opensource.com/article/17/7/brewing-beer-python-and-raspberry-pi
http://web.craftbeerpi.com/hardware/
Because I found craftbeerpi to complex for my prototype I wrote a python script to control the temperatures.
# will hold the temperatur of 67 °C for 10 mintes
./brewer.py -t 67 -d 10
#GPIO PIN of the heating element:
GPIO_HEAT = 12
#Temperatur offset:
TEMP_OFFSET = 1.0
#add adtional temp sensor:
temp_sensors.append("/sys/bus/w1/devices/xxxxxx/w1_slave")