This Flora - compatible Si1145 UV index sensor is great for keeping you safe from sunburn. To use it, first connect the 3V, SDA, SCL, and GND pads of the sensor to the same pads on your Flora in that order. After that, load the Arduino library and example code from our tutorial onto your Flora. Keep in mind that this sensor is a bit too complex for Gemma, so it's best used with Flora. As for maintenance, keep it in a dry place away from direct sunlight when not in use. If you notice any issues with data accuracy, try re - loading the library code.