[Fjord Carver] brings together an RGB LED and CdS Photoresistor to make a color sensor. Those Cadmium Sulfide lights sensors usually have a very wide swing of resistance when exposed to varying ...

The audio track is encoded as a translucent strip ... with a light source to decode the optical signal. She tried to use a photoresistor and a discrete photodiode, but neither had the required ...

Make: Hikvision Model code: DS-KB2421-IM Type of Kit/ System: Video, Keypad & Audio Vandal Resistant: Yes No of Call Buttons on Panel: 1 call buttons Hands-free video intercom communication Supports ...