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

I do have a Pico sitting around. Maybe I can use it for a thermometer project.

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

    Picos are very bad for battery applications. If you do end up doing this, make sure it is mains-powered like your original thought.

    Esp32s, MSP430s, and nRF chips have sleep currents down to around 5uA or less.

    Picos have sleep currents of 1-4mA. That is 1000x higher and the battery will only last for a few days instead of a few years.

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