LDR – 20mm


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LDR(Light Dependent Resistor) also known as photoresistor is a resistor whose resistance varies with the amount of light falling on it. This is a large size LDR with a size of 20mm.

To use, connect one side of the photo cell (either one, its symmetric) to power (for example 5V) and the other side to your microcontroller’s analog input pin. Then connect a 10K pull-down resistor from that analog pin to ground. The voltage on the pin will be 2.5V or higher when its light out and near ground when its dark.

This sensor can be used for making a light sensor, color sensor, object sensor, line sensor, etc.

Analog Applications:-


  • Camera exposure control
  • Auto slide focus – dual cell
  • Photocopy machines – the density of the toner
  • Colorimetric test Equipment
  • Densitometer
  • Electronics scales – dual cell
  • Automatic gain control – modulated light source
  • Automated rearview mirror


Digital Applications:-


  • Automatic headlight dimmer
  • Nightlight control
  • Oil burner flame out
  • Streetlight control
  • Absence/presence (beam breaker)
  • Position sensor


Other applications:-


  • Annunciator
  • Camera automatic photometry
  • Electronic toy
  • Industrial control
  • Light control
  • Light control lamp
  • Photoelectric control
  • Switch




  • Coated with epoxy
  • Good reliability
  • High sensitivity
  • Small volume
  • Fast response
  • Good spectrum characteristic




  • Diameter : 20mm
  • Number of Pins : 2
  • Dark resistance : max. 2kΩ
  • Spectral Peak : 560nm
  • Light Resistance (10 lux) : 10 – 20 kΩ
  • Maximum Voltage : 500VDC
  • Maximum Power : 0.5W
  • Response Time(μS) : 30


Package Includes:-

1 x LDR – 20mm

* Product Images are shown for illustrative purposes only and may differ from actual product.


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