use to Dectect Light
Can control Light sensitivity
Day/Night light sensors
easily conpatible with arduino
 
The LDR Sensor Module is used to detect the presence of light or measuring the intensity of light. The output of the module goes high in the presence of light and it becomes low in the absence of light. The sensitivity of the signal detection can be adjusted using potentiometer.
LDR light sensor is a special type of sensor which can detect the light and give signal to arduino. In this sensor three port VCC, GND , OUT. Out port provides Digital 0 or 1 signal depending upon the available of light. so using this sensor you can detect light and can automated any other electronic system.. You can adjust the light sensitivity using the pot meter by rotating it.