Sensirion SHT40/SHT41/SHT45
Also known as: SHT40 · SHT41 · SHT45 · SHT4x · Temperature & humidity
The new default for anyone who cares about the number being right: Sensirion accuracy for clone-board money, tiny, microamp idle, with an on-die heater to recover from humidity creep.
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At a glance
⚑ flag an error| Measures | temperature, humidity |
|---|---|
| Accuracy | ±0.2 °C / ±1.8 %RH (SHT41) — the accuracy benchmark at hobby prices |
| Interface | I2C @ 0x44 |
| Supply | 1.08–3.6 V |
| Battery-viable | Yes (deep-sleep friendly) |
| ESPHome | Native ESPHome component — sht4x |
| Typical price | $1-3 (street, varies) |
Compare all sensor modules in one table →
Which one do I buy?
SHT41 vs SHT31: same family, SHT4x is newer/cheaper/lower-power. vs DHT22: no contest — better accuracy, I2C, 10x faster, same price.
Clone check
Good for
Gotchas to know
- 3.6 V max — don't feed a bare SHT4x 5 V (modules with regulators vary; read the listing).
- Like all RH sensors, conformal coating or a stuffy enclosure ruins the reading — ventilate the case.
Wiring it up
It's I2C, so it shares two pins with every other I2C sensor you own — chain your climate/light/CO2 stack on one bus and mind the address clashes (this one lives at 0x44). Any ESP32 dev board works.