I was wondering if someone has done something similar:

I want to detect if one of the kitchen burners have been running for a long time. Gas sensors won’t work because the fires are running.

I was thinking that a solution could be to have a wifi-enabled thermostat that sends the temperature to home assistant and if it is above > X for Y minutes, send an alarm/email/notification. The sensor could be hidden below the burners and connected via a cable to measure the temperature.

Does this make sense? Does anybody have some idea how to implement this (maybe using a ESP8266)?

Is there other alternative?

cc @homeassistant@lemmy.world @homeassistant@fosstodon.org @selfhost@lemmy.ml @selfhosted@lemmy.world @ironicbadger@techhub.social

  • DeltaTangoLima@reddrefuge.comEnglish
    2·
    10 months ago

    Sounds like a simple enough job using a DS18B20 sensor on a cable. They’re digital ambient temperature sensors with ±0.5°C accuracy, and can usually be picked up quite cheaply.

    Aside from GND and 5V, they only use a single GPIO pin. As each one has s unique 64-bit address, you can wire more than one to the same GPIO pin without any issues. The only other thing you’ll need is a 4.7K resistor on the 3.3V to the GPIO.

    Here in Australia, I got these from Amazon, and wired three up on a single GPIO pin for our lizard’s enclosure. I then wrote a quick and dirty Python script that publishes the temps into MQTT four times a minute, and load them as sensors in HA, to do things with. Admittedly, I’m running them on a Raspberry Pi, but that’s only because I’m also hosting a couple of webcams on it, to keep an eye on the lizard.

    You could absolutely do this with an ESP board - esphome has you covered.

    Edit: this tutorial will help you get started on how to wire it up.

    • glimse@lemmy.worldEnglish
      2·
      10 months ago

      You can’t just post all that and not show the lizzy! I love pet-related automations

      • DeltaTangoLima@reddrefuge.comEnglish
        2·
        10 months ago

        No worries - I’ve found them to be very effective. Just make sure you buy genuine ones. I bought a pack of (very) cheap ones and they were shit. Kept dropping after an hour or so, needing me to restart the service.

        I edited my comment above with a link to a tutorial on how to wire them up on an ESP board. Have fun! Things like this are great weekend projects.