Beer fermentation controller
go
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fermentord

Control the temperature of your fermentation process.

TODO

  • Cooler should not have min runtime, but run till min. temp cool level
    • E.g. cool until setpoint - 1 degrees is reached
    • ...or just make the damned PID work

Epics

Heater/Cooler

Persona Description
Brewer The person responsible for the wort and the fermentation process
Operator The person responsible for the fermentation tank and the system controlling it

As a brewer I need to maintain the wort at a specific temperature so that my fermentation process is predictable As an operator I need an alert if the system can't maintain the temperature, so that I may correct the problem

Ambient temperature

  • Ambient temperature
  • Case temperature
  • Wort temperature
  • Wort gravity

User stories

Acceptance criteria

  • Given the wort is at or above the requested temperature and the heater is running then stop the heater

  • Given the wort is above the requested temperature and the heater is not running then start the cooler

  • Given the wort is above the requested temperature

  • Given the wort is too cold and the cooler is running then stop the cooler

  • Given the wort is too cold and the cooler is not running then start the heater

  • Given the cooler is running

  • Given the cooler is running when then the heater may not start

  • Given the heater is running then the cooler may not start

  • Given the temperature is

Data logging

  • Ambient temperature

  • Case temperature

  • Wort temperature

  • Wort gravity

  • Data is stored in sqlite3

  • Data is scraped and stored in PostgreSQL

  • Data is removed from sqlite3 when confirmed in PostgreSQL

Metrics

Prometheus metrics

  • Ambient temperature
  • Chamber temperature
  • Wort temperature
  • Wort gravity
  • Heater state
  • Cooler state
  • Tank pressure

Drivers

On the Raspberry Pi you'll need to add dtoverlay=w1-gpio (for regular connection) or dtoverlay=w1-gpio,pullup="y" (for parasitic connection) to your /boot/config.txt. The default data pin is GPIO4, but that can be changed from 4 to x with dtoverlay=w1-gpio,gpiopin=x.

echo dtoverlay=w1-gpio,gpiopin=4,pullup=0 >> /boot/config.txt

modprobe wire
modprobe w1-gpio
modprobe w1-therm

Build

A Raspberry Pi 1 is used, so we compile for ARMv6.

cd cmd/fermentord
GOARCH=arm GOARM=6 GOOS=linux go build