Product Description

The LTR390 is one of the few low-cost UV sensors out there, and it's pretty good! With ambient light and UVA sensing, peak spectral response is between 300 and 350 nm. You can use it to measure how much sunlight you can get before you need to cover up.

Unlike the Si1145, this sensor does not give you a UV index reading. However, the Si1145 makes UV index approximations based on light levels, rather than true UV sensing. In contrast, the LCR-390 does have a true light sensor in the ultraviolet spectrum. It also has a simpler I2C interface, so you can easily run it on an Arduino or Python microcontroller/microcomputer. Unlike GUVA analog sensors, both the bias and ADC are internal, so you don't need an ADC.

To make it as easy as possible to use, we put the LTR390 on a Stemma QT-shaped split-line PCB with a small number of support circuits to give you options when testing. You can use a breadboard or a SparkFun qwiic compatible STEMMA QT connector that is compatible with the 5V voltage level common on Arduinos, as well as the 3.3V logic used by many other boards. QT cables are not included, but we offer a variety of fast plug and play support in the store.

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