Light Dependent Resistor

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  • A photoresistor or light-dependent resistor (LDR) or photocell is a light-controlled variable resistor.
  • The resistance of a photoresistor decreases with increasing incident light intensity.
  • It exhibits photoconductivity.
  • Can be applied in light-sensitive detector circuits, and light- and dark-activated switching circuits.
  • Can be used to sense Light
  • Easy to use on Breadboard or Perf Board
  • Easy to use with Microcontrollers or even with normal Digital/Analog IC
  • Small, cheap and easily available


  • The Light Dependent Resistor (LDR) or also popularly known as Photoresistor is just another special type of Resistor and hence has no polarity so they can be connected in any direction.
  • They are breadboard friendly and can be easily used on a perf board also.
  • The symbol for LDR is similar to Resistor but includes inward arrows as shown above in the LDR pinout diagram.
  • The arrows indicate the light signals.
  • photoresistor or LDR (Light Dependent Resistor), as the name suggests will change it resistance based on the light around it. That is when the resistor is placed in a dark room it will have a resistance of few Mega ohms and as we gradually impose light over the sensor its resistance will start to decrease from Mega Ohms to few Ohms.
  • This property helps the LDR to be used as a Light Sensor. It can detect the amount of light falling on it and thus can predict days and nights. So if you are looking for a sensor to sense light or to distinguish between days and nights then this sensor is the cheap and modest solution for you.


  • Automatic Street Light
  • Detect Day or Night
  • Automatic Head Light Dimmer
  • Position sensor
  • Used along with LED as obstacle detector
  • Automatic bedroom Lights
  • Automatic Rear view mirror