const int LDRPIN=A0;
void setup() {
  // put your setup code here, to run once:
   Serial.begin(9600);
   pinMode(7, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
    float value=analogRead(LDRPIN);
    if(value>300)
    {
      digitalWrite(7, HIGH);
    }
    else
    {
      digitalWrite(7,LOW);
    }
}