Adafruit LTR390 UV Light Sensor - STEMMA QT / Qwiic [PID:4831] - (AD76266)

Description:

The LTR390 is one of the few low-cost UV sensors available, and it's pretty good! It detects ambient and UVA light with a peak spectral response between 300 and 350 nm. You can use it to measure how much sun you can expect to receive before needing to cover up.

Unlike the Si1145, this sensor will not give you UV index readings. However, the Si1145 approximates the UV index based on light level, not actual UV detection. The LTR-390, on the other hand, has an actual light sensor in the UV spectrum. It also has a much simpler I2C interface so you can run it on Arduino or Python microcontrollers/microcomputers with ease. Unlike the GUVA analog sensor, the bias and ADC are internal, so you don't need an ADC.

To make it as easy as possible to use, we’ve placed the LTR390 on a PCB in our Stemma QT form factor with a smattering of support circuitry to give you options when testing. You can use a breadboard or the SparkFun Qwiic-compatible STEMMA QT connectors, and it supports 5V voltage levels commonly found on Arduinos, as well as the 3.3V logic used by many other boards like the Raspberry Pi or our Feathers. The QT cable is not included, but we have a variety in store for quick plug-and-play support.

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