How strong a sunscreen do you need? How much UV do your sunglasses filter? Why are tanning booths a dumb idea? UV click can help you answer these questions.
UV click carries an ML8511 UV sensor IC that outputs a voltage that is linearly proportional to the UV intensity it detects (UV intensity is measured in mW/cm2).
An onboard ADC converts the signal, but you can bypass it and use the ADC on your microcontroller instead—just solder the A/D Select jumper (zero-ohm resistor) to the AN position.
The sensor responds to UV-A and UV-B rays. UV-A makes up to 95 percent of Ultraviolet light we're exposed to, but UV-B is the one causing sunburns. Be careful when experimenting with it.