LTR390 UV + Ambient Light Sensor
Measures both UV light (UV Index) and visible ambient light (lux) in a single sensor. Great for weather stations and UV exposure monitoring.
Say it to PAL
“Keep an eye on the UV index.”
The code PAL writes
p.onSensorChange('qwiic-ltr390', 'uv_index', (uvi) => {
if (uvi > 6) p.notify('UV Index high: ' + uvi);
});
await p.waitUntilStopped();When to pick it
UV Index + ambient light (lux) in one sensor for ~$5.
About it
A dual-purpose light sensor that measures ultraviolet radiation (for UV Index calculation) and visible ambient light (in lux). Uses two separate photodiodes — one optimized for UV (280-430nm) and one for visible light — giving accurate readings for both. Small, affordable, and ideal for weather stations, wearable UV monitors, and adaptive lighting.
Facts
Tested
Its driver works. We have not signed it off on a real board yet.
I2C address
The LTR390 UV + Ambient Light Sensor answers at I2C address 0x53. The address is fixed.
Current
100 µA
The catalog lists a typical draw of 100 µA for the LTR390, copied from the maker’s description and not measured by Palpable.
Board size
25.4 × 17.78 mm
The LTR390 board measures 25.4 × 17.78 mm and stands 4.6 mm tall with its parts. It has 4 mounting holes. These dimensions are from the maker’s mechanical drawing.
Chip
LTR-390UV-01
Its sensor is the Lite-On LTR-390UV-01.
Free to reuse
Every fact here is open data under CC BY 4.0. Copy it into your own docs or code, and credit Palpable. Download it
This record was last changed on September 24, 2026.