Comment on homeassistant

realitaetsverlust@piefed.zip ⁨1⁩ ⁨month⁩ ago

• KryptonNerd@slrpnk.net ⁨1⁩ ⁨month⁩ ago

  The kettle?!

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  • realitaetsverlust@piefed.zip ⁨1⁩ ⁨month⁩ ago

    Yes. It’s not a kettle as in the pot you put on the stove, but an electric water … heater … thingy. I honestly have no idea how to call it in english. The german word would be “Heißwasserspender”, literally translating to “hot water dispenser”. I disassembled it, soldered a tiny raspberry pi board to it that could control the device as you could with the buttons and wrote a rudimentary API that I now control via home assistant.

    Within HA, I can control the kettle via calling the API of the pi. For example, I got a script that triggers if my girlfriends phone is entering my WLAN-network.

    The call to the API looks like this:

    rest_command:
      kettle_set_params:
        url: "http://kettle.local"
        method: POST
        content_type: "application/json"
        payload: '{"amount": {{ amount }}, "temp": {{ temp }}}'
    

    It’s dynamic, so for the “default black tea” she likes, these are the arguments

    set_kettle_default_black_tea:
      alias: "Set Kettle"
      sequence:
        - service: rest_command.kettle_set_params
          data:
            amount: 500
            temp: 100
    

    And this is the trigger:

    - alias: "Start kettle when Ana home"
      trigger:
        - platform: state
          entity_id: device_tracker.pixel6_ana
          from: "not_home"
          to: "home"
          for: "00:00:10"
      condition:
        - condition: time
          after: "18:00:00"
          before: "20:00:00"
      action:
        - service: script.set_kettle_default_black_tea
    

    That call is received by the pi, who then triggers the kettle. So every time my girlfriends phone is entering the wifi, it’s between 18:00 and 20:00 and there’s a cup present (done via a simple proximity sensor that I glued to the side of the kettle. That’s also not known to the home assistant, I didn’t really know how to feedback that information to it so I just had it handled by the pi itself), the kettle triggers and dispenses hot water. She can also do it manually via the home assistant app, I made a widget for that where you can just select temperature, amount and that’s it.

    I just hope the thing never breaks because I reassembled it using superglue, but then I noticed I forgot to install SSH on the pi, making it kinda an isolated piece of software that I just hope keeps running indefinitely lol.

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