LTR390 (UV)
Also known as: LTR390 · LTR-390UV · Light & UV
The hobbyist UV sensor now that the VEML6075 is discontinued: UV index for weather stations and 'reapply sunscreen' dashboards, plus ambient light as a bonus.
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At a glance
⚑ flag an error| Measures | uv, lux |
|---|---|
| Accuracy | UV index + ambient light; absolute UVI approximate on diffuser-less boards |
| Interface | I2C @ 0x53 |
| Supply | 3.3 V |
| Battery-viable | Yes (deep-sleep friendly) |
| ESPHome | Native ESPHome component — ltr390 |
| Typical price | $2-4 (street, varies) |
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Clone check
Low clone risk. Buy from any reputable listing.
Good for
Gotchas to know
- Cheap boards omit the optical diffuser, so absolute UV index is approximate — calibrate against a weather service and treat it as relative.
- Point it at the sky: UV through a window is a different measurement.
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 0x53). Any ESP32 dev board works.