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.
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.
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