Photoconductive cells are sensors that allow you to detect light. They are small, inexpensive, low−power, easy to use, and don’t wear out. NTEs light−dependent resistors (LDR) are photoresistors whose resistance decreases with increasing incident light intensity. In other words, when it is dark, they have a high electrical resistance and when it is light, their electrical resistance is low.

Typical Applications Digital Applications

• Automatic Headlight Dimmer
• Night/Streetlight Control
• Photoelectric Control
• Industrial Control
• Security System

Analog Applications

• Camera Exposure Control
• Automatic Gain Control