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Anyone know any good DC powered or USB powered thermometers? (discuss.tchncs.de)

submitted 2 days ago* (last edited 2 days ago) by Seldon@discuss.tchncs.de 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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[–] Seldon@discuss.tchncs.de 2 points 2 days ago (1 children)

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

[–] JustEnoughDucks@feddit.nl 3 points 2 days ago* (last edited 2 days ago) (1 children)

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.

[–] Seldon@discuss.tchncs.de 1 points 2 days ago

Thanks for the insight, good to know.