AnovaMaster

AnovaMaster acts as a bridge between an Anova immersion sous vide device and an MQTT bus. It broadcasts current status of the cooker on a given MQTT channel, and receives commands to control the device.

It was written to integrate with Home Assistant using the MQTT HVAC component. But should work well with any other automation system.

Requirements

• Any Bluetooth adapter supported by Linux should work. I've only ever tested this running on a Raspberry Pi Zero W, though.
• Python 2. Sorry.

Installation

• Check out the code and change in to the new directory.

• Install dependencies

    $ sudo apt-get install libglib2.0-dev virtualenv
  

• Create and activate a python virtual environment

    $ virtualenv venv
    $ . venv/bin/activate
  

• Install dependencies

    $ pip install -r requirements.txt
  

• Create a configuration file. Refer to comments in the config file for how to set it up.

    $ cp config/AnovaMaster.cfg.sample config/AnovaMaster.cfg
    $ nano config/AnovaMaster.cfg
  

• Run it.

    $ ./run.py
  

Status packet

AnovaMaster broadcasts regular status messages to MQTT. The payload of these is a JSON packet with the following format:

    {
	  "state": "running",
	  "current_temp": "140",
	  "target_temp": "140",
	  "temp_unit": "F"
    }

state

The state field will be one of

• "stopped"
• "running"
• "disconnected"

Temperatures

Temperatures are represented as a string, accurate to one decimal place. The temp_unit field will be one of

• "C"
• "F"

Sending commands

AnovaMaster currently supports turning the Anova on/off, and setting the temperature. Each can be done by sending a message with the topic as configured in the config file.

Setting state

The payload should be one of these strings

• "stopped" - turn the Anova off
• "running" - turn the Anova on

Setting temperature

The payload should be a float. AnovaMaster will set it as the desired temperature in whichever unit the Anova is currently set to. The temperature must be inside these limits, otherwise it will be discarded:

	Celsius	Fahrenheit
Maximum	20	77
Minimum	99	210

Integration with Home Assistant

I'm using the following in my configuration.yaml to integrate with this script:

climate:
  - platform: mqtt
    name: Sous vide
    modes:
      - disconnected
      - stopped
      - running
    current_temperature_topic: anova/status
    current_temperature_template: "{{ value_json.current_temp }}"
    temperature_state_topic: anova/status
    temperature_state_template: "{{ value_json.target_temp }}"
    mode_state_topic: anova/status
    mode_state_template: "{{ value_json.state }}"
    mode_command_topic: anova/command/run
    temperature_command_topic: anova/command/temp

sudo cp anova.service /lib/systemd/system/
sudo systemctl enable anova.service
sudo systemctl start anova.service