// Pin definitions
int pirPin = 2;      // PIR sensor output pin connected to D2
int ledPin = 3;      // LED connected to D3
int buzzerPin = 4;   // Buzzer connected to D4

int pirState = LOW;  // Start assuming no motion
int val = 0;         // Variable to store PIR state

void setup() {
  pinMode(pirPin, INPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);

  Serial.begin(9600);
}

void loop() {
  val = digitalRead(pirPin);  // Read PIR sensor

  if (val == HIGH) {  
    digitalWrite(ledPin, HIGH);     // Turn LED on
    digitalWrite(buzzerPin, HIGH);  // Turn buzzer on

    if (pirState == LOW) {
      Serial.println("Motion detected!");
      pirState = HIGH;
    }
  } else {
    digitalWrite(ledPin, LOW);      // Turn LED off
    digitalWrite(buzzerPin, LOW);   // Turn buzzer off

    if (pirState == HIGH) {
      Serial.println("Motion ended!");
      pirState = LOW;
    }
  }
}