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  • LDR - 5mm

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 5mm.

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


  • Diameter : 5mm
  • Number of Pins : 2
  • Type of Mounting: PCB Through Hole
  • Maximum Operating Temperature: +800°C (Approx.)
  • Dark resistance : 1-20M ohm

Package Includes:-

1 x LDR - 5mm

Brand/Manufacturer Generic
Country Of Origin China
Packer / Importer Address Constflick Technologies Limited, Building No 13 and 14, 3rd Floor, 2nd Main, Siddaiah Road, Bangalore, Karnataka - 560027 India.
MRP Rs. 11.21 (Inclusive of all Taxes)
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* Product Images are shown for illustrative purposes only and may differ from actual product.

LDR - 5mm

  • Product Code: EC-0414
  • Availability: 11247
  • Rs.9.50
  • (Excluding 18% GST)


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