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Adafruit LTR390 UV Light Sensor

Adafruit LTR390 UV Light Sensor

Pimoroni

£4

Price read from Pimoroni on 2026-10-22. Check before buying.

The LTR390 is one of the few low-cost UV sensors available, and it's a pretty nice one! With both ambient light and UVA sensing with a peak spectral response between 300 and 350nm. You can use it for measuring how much sun you can get before needing to covering up. Unlike the Si1145 , this sensor will not give you UV Index readings. However, the Si1145 does UV Index approximations based on light level not true UV sensing. The LTR-390, in contrast, does have a real light sensor in the UV spectrum. It's also got a much much simpler I2C interface so you can run it on the Arduino or Python microco

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