LDR using arduino board

SOURCE CODE

const int ldrpin = A0;

const int ledpin = 7;

void setup() {

pinMode(ledpin, OUTPUT);  // put your setup code here, to run once:

}

void loop() 

{

  int sensorValue = analogRead(ldrpin);

   if (sensorValue<150)

    digitalWrite(ledpin, HIGH);

  else 

    digitalWrite(ledpin, LOW);

    

}

Circuit Diagram