//https://www.electronicshub.org/automatic-room-lights-using-arduino-pir-sensor/
int in1 = 7;
int sensor = 8;
int led = 13;
int buzzer = 2;
unsigned long t=0;

void setup() 
{
  Serial.begin(9600);
  pinMode(in1, OUTPUT);
  pinMode(sensor, INPUT);
  pinMode(led, OUTPUT);
  pinMode(buzzer, OUTPUT);
  
  digitalWrite(in1,HIGH);
  digitalWrite(led,LOW);

  while(millis()<13000)
  {
    digitalWrite(led,HIGH);
    delay(50);
    digitalWrite(led,LOW);
    delay(50);
  }
  digitalWrite(led,LOW);
  
}


void loop() 
{
  digitalWrite(in1,LOW); //switch light is off
  digitalWrite(led,HIGH); //LED Lights on means switch light is off
  noTone(buzzer); //turn off buzzer
  if(digitalRead(sensor)==HIGH)
  {
   t=millis();
   while(millis()<(t+5000))
   {
   digitalWrite(in1,HIGH); //switch light is on
   digitalWrite(led,LOW); //LED Lights off means switch light is on
   tone(buzzer,1000); //turns on buzzer
     if((millis()>(t+2300))&&(digitalRead(sensor)==HIGH))
      {
       t=millis();
      }
   }
  }
}