const int led=11;
void setup() {
    // put your setup code here, to run once:
   pinMode(led, OUTPUT);
   Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
 int sensor=analogRead(A0);
 int a=sensor*5/1024;
 Serial.print("Sensor value is :");
 Serial.println(a);
 if(a>=3){
   Serial.println("led is turn On");
   digitalWrite(led, HIGH);
 }
 else{
   Serial.println("led is turn Off");
   digitalWrite(led, LOW);
 }
}