The photosensor is a simple cadmium sulfide cell, which measures the intensity of light bouncing back from an object as an Arduino drives the LED through all possible colors with PWM signals.

Those Cadmium Sulfide lights sensors usually have a very wide swing of resistance when exposed to varying levels of light sensitivity. That makes for great resolution when reading them using the ...

Semiconductor nanoparticles typically consist of a crystalline core made from a semiconductor material, such as cadmium selenide (CdSe), cadmium sulfide (CdS), or indium phosphide (InP). The core is ...