int res = 0; /* declaring the variable that will store the value of photoresistor*/
int sensor = A0;/* assigning Arduino pin for photoresistor*/
int led= 5;/* assigning Arduino pin for LED*/
void setup() {
Serial.begin(9600); /*setting the baud rate for serial communication*/
pinMode(5, OUTPUT); /* assigning mode to LED pin */
}

void loop() {
    // put your main code here, to run repeatedly:
res = analogRead(sensor); /* getting the value of photoresistor*/

Serial.println(res); /* displaying the photoresistor value on serial monitor */

    if(res > 100) { /* when the value of sensor is less than 100 */
Serial.println(" Low intensity ");
digitalWrite(5,LOW); /* keep the LED off*/

    }
    else { /* otherwise turn the light on */
Serial.println("High Intensity ");
digitalWrite(5,HIGH); /* turn the LED on*/

    }
delay(1000);
}