Adafruit digital infra red visible light sensors with i2c 5v ready adafruit 1777 the adafruit si1145 i2c digital uv index ir visible light sensors use individual visible and infra red ir sensors and calculate the uv index accordingly they are 3 to 5v compatible and communicate with almost any microcontroller over i2c should you need proximity measurements you can add an ir led to one of these sensor boards for a detection range between 10 and 500mm adafruit supply a free tutor