const int pirPin = 4;        // PIR sensor output connected to ESP32 GPIO15 (D15 on NodeMCU board)
const int buzzerPin = 5;     // Buzzer connected to ESP32 GPIO3 (D3 on NodeMCU board)
const int ledPinred = 18;    // Red LED connected to ESP32 GPIO18 (D18 on NodeMCU board)
const int ledPingreen = 15;  // Green LED connected to ESP32 GPIO15 (D15 on NodeMCU board)
const int buttonPin = 13;    // Pushbutton connected to ESP32 GPIO13 (D13 on NodeMCU board)

void setup() {
  pinMode(pirPin, INPUT);          // Set PIR sensor pin as input
  pinMode(buzzerPin, OUTPUT);      // Set buzzer pin as output
  pinMode(ledPinred, OUTPUT);      // Set red LED pin as output
  pinMode(ledPingreen, OUTPUT);    // Set green LED pin as output
  pinMode(buttonPin, INPUT);// Set pushbutton pin as input with internal pull-up resistor
  Serial.begin(115200);            // Initialize serial communication for debugging (optional)
}

void loop() {
  int pirState = digitalRead(pirPin); // Read the state of the PIR sensor

  if (pirState == HIGH) { // If motion is detected
    Serial.println("Motion detected!");
    for (int i = 0; i < 100; i++) { // Blink the red LED and the buzzer 10 times
      digitalWrite(ledPingreen, LOW);
      digitalWrite(ledPinred, HIGH);   // Turn on the red LED
      analogWrite(buzzerPin, 128);     // Turn on the Buzzer with 50% duty cycle (adjust the value as needed for the desired sound)
      delay(200);                      // Keep the red LED and buzzer on for 200 milliseconds
      digitalWrite(ledPinred, LOW);    // Turn off the red LED
      analogWrite(buzzerPin, 0);       // Turn off the Buzzer (0 duty cycle means off)
      delay(200);                      // Keep the red LED and buzzer off for 200 milliseconds
        // Check if the pushbutton is pressed
      if (digitalRead(buttonPin) == HIGH) {
        Serial.println("Button pressed!");
          analogWrite(buzzerPin, 0);       // Turn off the Buzzer (0 duty cycle means off)
          delay(200);                      // Keep the green LED and buzzer off for 200 milliseconds
          break;
    }
    }
  } else {
    digitalWrite(ledPingreen, HIGH);
    Serial.println("No motion detected.");
    delay(200); // Small delay to reduce false detections (optional)
  }


  }