Playing around with an LDR / Photo-resistor

The LDR / Photo-resistor is basically a very simple light sensor that changes its resistance with light, lowering with more light.



To wire your LDR to Arduino, connect the following pins:

  • Ldr Pin 1 –> Arduino 5V
  • Ldr Pin 2 –> Arduino Pin A0
  • Ldr Pin 2 –> Arduino Ground via Resistor 10K


Recommended Software

  • none

Instructions and Code

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