fermentord

Control the temperature of your fermentation process.

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
Case temperature
Wort temperature
Wort gravity
Heater state
Cooler state

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,pgiopin=4 >> /boot/config.txt

modprobe wire
modprobe w1-gpio
modprobe w1-therm

Build

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

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