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About the module

LDRĀ  are light-sensitive devices most often used to indicate the presence or absence of light or to measure the light intensity. An LDR can be applied in light-sensitive detector circuits and light-activated and dark-activated switching circuits.

The resistance of a photoresistor decreases with increasing incident light intensity. In other words, it exhibitsĀ photoconductivity. A photoresistor is made of a high resistanceĀ semiconductor. In the dark, a photoresistor can have a resistance as high as several megohms (MĪ©), while in the light, a photoresistor can have a resistance as low as a few hundred ohms.

Setting up the LDR:

  • One end of LDR is connected through jumper wire(red wire ) to the 5V power supply in the Arduino board.

  • Another end of LDR is soldered with 10K resistor. Through the common junction of LDR and 10K resistor, a jumper wire is taken and hooked into the analog input(here we have used A1 pin number in the Arduino board) of the Arduino board.

  • The free end of the resistor is grounded with the help of a jumper wire.