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HA compatible sensors for a terrarium?
(lemmy.sdf.org)
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I agree with this, unless you paticularly want to do it yourself. You could even get a couple for redundancy for und
Sonoff SNZ02 for a small coin cell device, or Tuya if you want to use AAAs. (Tuya ones are a little cheaper too)
Edit: A bonus one if you also want a screen in the tank: Sonoff SNZB-02D.