The simplest optical sensor is a photoresistor, and it can be identified by the meandering channel between two terminals. The low-end versions are made with cadmium sulfide; their more-expensive ...

1. This block diagram represents a typical ALS/Prox sensor. 2. Different light types affect the performance of an ALS. An ambient light sensor provides consistent light reading irrespective of the ...

An overwhelming majority of handheld devices these days have ambient light sensors built into them. A large percentage of TVs and monitors do, too, and that proportion is growing.