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Brewmoth

The gist

Brewmoth is a project to convert a Raspberry Pi into a general tool to assist with home-brewing, but can also be used more generally for temperature logging and control.

Background

The original motivation was to use create a DYI fermentation chamber using peltier modules, but the code can be used more generally than that. For example, you can use it to make a temperature logger that interfaces with brewfather or to control a standard keezer set-up with InkBird and resistive heater, but with added temperature logging.

Fresh setup

Connecting to the Raspberry pi

This is beyond the scope of this README, but here are some resources. There are two options:

  1. Edit the SD card on your normal computer to add your Wi-Fi details. Here is an example guide on how to do this.
  2. Alternatively you can connect a USB hub with a keyboard and mouse, and an HDMI monitor to add the Wi-Fi details as normal

Once the Wi-Fi details can be added you can use ssh to connect to the raspberry pi. More information can be found here.

Full installation

  1. Create the directory but change username to your own username: 
    sudo mkdir /brewmoth
sudo chown username:username /brewmoth
  2. Install the following: 
    sudo rpi-update
sudo apt update
sudo apt upgrade
sudo apt install python3 python3-pip nginx libatlas-base-dev libopenjp2-7 pigpio
sudo apt update
sudo apt autoremove
sudo pip3 install virtualenv
sudo systemctl enable pigpiod
sudo service pigpiod start
  3. Copy repository to /brewmoth
  4. Create a virtual environment with following requirements 
    cd /brewmoth
virtualenv brewvenv
source /brewmoth/brewvenv/bin/activate
pip3 install uwsgi flask flask_cors systemd requests pigpio gpiozero matplotlib
deactivate
  5. Type ls /sys/bus/w1/devices/ to get the serial numbers of any installed 1-wire type temperature sensors. These will be a long string starting with some numbers, not anything that starts with w1
  6. Copy example-config.json and set the properties like so:
    1. First, change the name as required.
    2. Second, edit the "Temperature sensors" section so there is at least one sensor of type "Main". The serial portion is where you add the string identified with the above command. The name of each sensor is completely up to you. If you want to have the moth update brewfather, add an entry like this: "Brewfather": True
  7. If using Nginx, link to configuration file, test the configuration works and restart nginx: 
    sudo ln -s /brewmoth/brewmoth_server/brewmoth.nginx /etc/nginx/sites-enabled/brewmoth
sudo nginx -t
sudo service nginx restart
    If not using nginx, you'll need to set up another service to connect to the unix socket that brewmoth is listening on.

You also can add the brewmoth directory to PATH to allow the above commands to be called from anywhere in the shell

  1. Call sudo nano ~/.profile to start editing the .profile file
  2. Add the following line PATH=~/opt/bin:$PATH to the end of the file.
  3. Exit with ctrl+x, select y and accept.

Run from command-line

To troubleshoot, it's best to start brewmoth using the command-line. First, you need to turn on the virtual environment:

source /brewmoth/brewvenv/bin/activate

You can then start the brewmoth using the command:

python /brewmoth/wsgi.py

Run as a service

Once you know everything is great, you can configure it the brewmoth service.

Configure service

To configure it as a service, stop any running brewmoth instance that you may have started through the command-line, and then activate the service file:

sudo ln -s /brewmoth/brewmoth_server/brewmoth.service /etc/systemd/system/brewmoth.service
sudo systemctl daemon-reload
sudo systemctl enable brewmoth
sudo service brewmoth restart

Optional services

If you want to enable temperature control you need to enable the thermostat service:

sudo ln -s /brewmoth/brewmoth_server/brewmoth-thermostat.service /etc/systemd/system/brewmoth-thermostat.service 
sudo systemctl daemon-reload
sudo systemctl enable brewmoth-thermostat
sudo service brewmoth-thermostat restart

Control service

You can now use normal linux service commands like the ones below:

sudo service brewmoth stop
sudo service brewmoth start
sudo service brewmoth restart
sudo service brewmoth status

Logs

To see the logs of the brewmoth service do sudo service brewmoth status for the latest lines or sudo journalctl -u brewmoth.service for the full history.

Control Brewmoth

Once brewmoth has been started through the command-line or as a service, you can use the following commands from the brewmoth directory:

./temps
./track-temps
./fans
./peltiers

You can run any of the above commands with -h after to get more information on how and why to use them.

Note, for track-temps you might need to first activate the virtual environment (see above).