Adafruit LTR390 UV Light Sensor - EMBLEM QT / Qwiic
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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 cover 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 microcontrollers/microcomputers with ease. Unlike the GUVA analog sensor , the biasing and ADC is all internal so you don't need an ADC.
To make using it as easy as possible, we've put the LTR390 on a breakout PCB in our Stemma QT form factor with a sprinkle of support circuitry to give you options when testing. You can either use a breadboard or the SparkFun qwiic compatible STEMMA QT connectors, and compatibility with 5V voltage levels as commonly found on Arduinos , as well as 3.3V logic used by many other boards like the Raspberry Pi or our Feathers. QT Cable is not included , but we have a variety in the shop for quick plug-and-play support.
