LDRs or Light Dependent Resistors are very useful, especially in light/dark sensor circuits. Normally the resistance of an LDR is very high, sometimes as high as 20000 ohms, but when they are illuminated with light resistance drops dramatically.


  • 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
  • Dimension 5mm



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