int irSensorPin = A0;  // Set the IR sensor pin to analog pin A0
int buzzerPin = 7;    // Set the buzzer pin to digital pin 7
int greenLEDPin = 8;  // Set the green LED pin to digital pin 8

void setup() {
  pinMode(irSensorPin, INPUT);   // Set the IR sensor pin to input
  pinMode(buzzerPin, OUTPUT);    // Set the buzzer pin to output
  pinMode(greenLEDPin, OUTPUT);  // Set the green LED pin to output
  Serial.begin(9600);            // Initialize the serial communication
}

void loop() {
  int distance = analogRead(irSensorPin);  // Read the distance value from the IR sensor
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  if (distance < 30) {     // If someone comes in range (less than 30cm away)
    digitalWrite(buzzerPin, HIGH);    // Turn on the buzzer
    digitalWrite(greenLEDPin, HIGH);  // Turn on the green LED
    delay(500);            // Wait for 500ms
    digitalWrite(buzzerPin, LOW);     // Turn off the buzzer
    digitalWrite(greenLEDPin, LOW);   // Turn off the green LED
  }
  delay(4000);  // Wait for 100ms before taking another reading
}