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Anyone know any good DC powered or USB powered thermometers? (discuss.tchncs.de)
submitted 3 months ago by to c/homeassistant@lemmy.world
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I'm looking around for DC or USB powered thermometers but I can't seem to find any. Granted, the battery powered ones last many years, but I'm looking to keep my options open. Zigbee devices are preferable. Anyone know?

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[–] 6 points 3 months ago (2 children)

ESPHome + DHT22 or DSB1820 + ESP32-C6 and a small hobby box plus power supply (old USB phone charger) and you can build your own.

https://esphome.io/components/zigbee/

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  • [–] [S] 2 points 3 months ago (1 child)

    I might do this option, thanks!

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  • [–] 2 points 3 months ago*

    I literally just did this over the past few weeks. I bought four ESP32-C3 minis on expansion boards (The expansion boards come with PH2.0mm connectors and built in battery charging management, so that I can add battery power next - already ordered the LiPo batteries. At the moment they're plugged into USB-C phone chargers) and four SHT-41 temperature and humidity meters. I then installed the espressif development environment and (don't shoot me, I was under time pressure) vibe-coded the setup for the ESP boards: they broadcast the readings every 10 seconds via mosquitto.

    I also bought a barebones raspberry pi and made it subscribe to the mosquitto feeds and write the data to a sqlite database, and created a basic flask website that reads the data from sqlite and shows the graphs and the temperature readings to anyone on my local wifi.

    My code is on codeberg - I'd be happy to share the link if any of this is relevant to you.

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