#define PIR_ip_PIN 7
#define Buzzer_PIN 9
boolean PIR_State = LOW;

void setup() {
  pinMode(PIR_ip_PIN, INPUT);
  pinMode(Buzzer_PIN, OUTPUT);
  Serial.begin(9600);

}

void loop() {
  if (digitalRead(PIR_ip_PIN)){
    if(PIR_State == LOW){
      Serial.println("Motion Detected");
      PIR_State = HIGH;
      tone(Buzzer_PIN, 1000, 3000); // Send 1kHz signal for 3 secconds on buzzer.
    }
  }
  else{
    if(PIR_State){
      Serial.println("No Motion");
      PIR_State = LOW;
      tone(Buzzer_PIN, 1000, 1000);
    }
  }
}