LDR 5mm Light Dependent Resistor Photoresistor CdS Light Sensor Through Hole (5mm LDR Sensor)
The 5mm LDR is a light dependent resistor designed to detect ambient light intensity by varying its resistance. It is a passive photoresistive device widely used in light sensing and automatic control applications.
Key Features -
- 5mm disc type light dependent resistor
- Resistance decreases with increasing light intensity
- Passive component no external power required
- High sensitivity to visible light
- Simple 2 pin through hole mounting
- Low cost and reliable operation
Specifications -
- Sensor type - light dependent resistor LDR
- Disc diameter - approx 5mm
- Light resistance - approx 5k ohm to 10k ohm typical
- Dark resistance - up to approx 500k ohm or higher
- Operating voltage - up to approx 150V typical
- Power rating - approx 100mW typical
- Mounting type - through hole
Applications -
- Automatic street light control systems
- Light and dark activated switches
- Camera light meters
- Smoke and fire detection systems
- Ambient light sensing circuits
- IoT and embedded electronics projects
Pinout Configuration -
- Pin 1 - resistive terminal
- Pin 2 - resistive terminal
Working Principle -
The LDR operates on photoconductivity where resistance changes based on light intensity. When light falls on the surface electrons gain energy and increase conductivity causing resistance to decrease. In darkness the resistance becomes very high while in bright light it drops significantly enabling light sensing functionality.
