this post was submitted on 04 Jan 2024
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Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io
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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.
@[email protected] Thanks! Yes, I was looking into ESP8266 + DS18B20, thanks!
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.
You can't just post all that and not show the lizzy! I love pet-related automations
Lol - he's been quite reclusive right now. Here's some video of him eating, soon after we brought him home.
He's nomming hard lol what kind of lizard is that?
Yeah - we've discovered he likes dog food! He's an Eastern Blue Tongue skink. They're native to my part of Australia (but still have to be purchased through licensed dealers).