IR Photocells

A photocell, or light-dependent resistor, LDR, or photo-conductive cell is a passive component that decreases resistance with respect to receiving luminosity (light) on the component’s sensitive surface.

Uses :

Photocells are used in automatic lights to activate whenever it gets dark, and the activation/deactivation of streetlights mainly depends on the day whether it is day or night.

• used to count the vehicles on the road.
• used to photovoltaic cells & variable resistors.
• used as switches as well as sensors
• used to burglar alarms to protect from a thief.
• used in robotics, wherever they direct robots to hide from view in the dark.
• used in exposure meters which can be used with a camera for knowing the correct time of exposure to get a good photo.