define relaypin 18
#define ldrpin 5
void setup() {
  pinMode(relaypin,OUTPUT);
   pinMode(ldrpin,INPUT);
  Serial.begin(115200);
  Serial.println("Smart Street Light");
  delay(1000);

}

void loop() {
  int val=digitalRead(ldrpin);
  if(val==0)
  {
    Serial.println("Its Day,turn off light");
    digitalWrite(relaypin,LOW);
  }else
    {
     Serial.println("Its Night,turn on light"); 
     digitalWrite(relaypin,HIGH);
         
  }
  delay(10); // this speeds up the simulat#ion
}