LDR 12mm Light Dependent Resistor Photoresistor CdS Light Sensor High Sensitivity Through Hole (12mm LDR Sensor)

The 12mm LDR is a large size light dependent resistor designed for accurate ambient light sensing applications. It provides higher sensitivity and faster response compared to smaller LDR sizes due to its larger sensing area.

Key Features -

• 12mm large disc type photoresistor
• High sensitivity to visible light spectrum
• Resistance decreases with increasing light intensity
• Passive component no external power required
• Two pin through hole mounting
• Better light absorption compared to smaller LDR

Specifications -

• Sensor type - light dependent resistor LDR
• Disc diameter - approx 12mm
• Light resistance - approx 10k ohm to 20k ohm at 10 lux
• Dark resistance - approx 1 mega ohm to 2 mega ohm
• Maximum voltage - approx 250V DC
• Power rating - approx 200mW
• Spectral peak - approx 560nm

Applications -

• Automatic street light and night lamp control
• Solar lighting and garden automation
• Light intensity measurement systems
• Camera exposure and light meters
• Arduino and IoT light sensing circuits

Pinout Configuration -

• Pin 1 - resistive terminal
• Pin 2 - resistive terminal

Working Principle -

The LDR operates on photoconductivity where resistance decreases as light intensity increases. When photons strike the semiconductor surface they generate free charge carriers which increase conductivity and reduce resistance.