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.