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2pc 12mm LDR Light Dependent Resistor Photoresistor


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Product Specifications

  • Size: 12mm
  • Material: Semiconductor Materials having high resistivities like Silicon or Germanium and copper
  • Package content: Light Dependent Resistor or LDR of 2 pieces
  • Shape: Round
  • Also called photoresistor, photocells, photoconductor, and photo conducting cell


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LDR stands for the light-dependent resistor or a photoresistor is basically a resistor whose resistance decreases with an increase in incident light intensity(photoconductivity).

A photoresistor is made up of high resistance semiconductor material. If the light falling on the LDR is of high enough frequency and energy density, photons get absorbed by the semiconductor give’s band electrons enough energy to jump to the conduction resulting in free-electron conduct electricity lowering resistance.

LDR is made of Semiconductor materials with high Resistance like Silicon or Germanium. It is a light-sensitive device, so this resistor has a different resistance value in day and night as given below

  • It requires less power to operate
  • Quick Response
  • Easy to use
  • Generate high current
  • Miniature open frame package.
  • Epoxy coated.
  • Moisture resistant.
  • Spectral response is similar to the human eye
  • Operating temperature: -30˚C ~ +70˚C
  • Response time: 20ms (Rise), 30ms (Down)
  • Camera Exposure Control
  • Colorimetric Test Equipment
  • Densitometer
  • Automatic Gain Control
  • Automated Rear View Mirror
  • Automatic Headlight Dimmer
  • Night Light Control
  • Oil Burner Flame Out
  • Street Light Control
  • Position Sensor
  • Auto Slide Focus – dual cell
  • Photocopy Machines – density of toner
  • Magnetometer
  • Electronic Scales – dual cell
Max power dissipation 200mW
Max voltage at 0 lux 250V
Peak wavelength 560nm
Min. resistance at 10lux ~10kΩ
Max. resistance at 10lux ~20kΩ
Typ. resistance at 100lux ~1kΩ – 5kΩ
(Dark) resistance after 1 sec ~1.7MΩ
(Dark) resistance after 5 sec ~2MΩ

Interface with Arduino

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