Sensirion SHT31 (GY-SHT31-D)
Also known as: SHT30 · SHT31-D · GY-SHT31 · Temperature & humidity
The temperature/humidity workhorse of the ESPHome era: accurate, 5 V-tolerant modules, two I2C addresses so you can pair them, and years of config examples.
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At a glance
⚑ flag an error| Measures | temperature, humidity |
|---|---|
| Accuracy | ±0.2 °C / ±2 %RH |
| Interface | I2C @ 0x44 / 0x45 |
| Supply | 2.4–5.5 V |
| Battery-viable | Yes (deep-sleep friendly) |
| ESPHome | Native ESPHome component — sht3xd |
| Typical price | $1-3 (street, varies) |
Compare all sensor modules in one table →
Which one do I buy?
vs SHT4x: functionally interchangeable for home use; buy whichever module is cheaper that week.
Clone check
Low clone risk. Same reworked-die tail as other Sensirion parts; boards with sloppy conformal coating develop RH creep.
Good for
Gotchas to know
- Two address pads (0x44/0x45) — set them if you run two on one bus.
- SHT30 variants are slightly less accurate; fine for automation.
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 / 0x45). Any ESP32 dev board works.