#include <ESP32Servo.h>   // ✅ ESP32 ke liye sahi library

#define TRIG_PIN 5     // Ultrasonic Trigger
#define ECHO_PIN 18    // Ultrasonic Echo
#define SERVO_PIN 21   // Servo motor pin
#define PIR_PIN 19     // PIR sensor pin

Servo myServo;

void setup() {
  Serial.begin(115200);

  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(PIR_PIN, INPUT);

  myServo.attach(SERVO_PIN);
  myServo.write(0);  // Lid closed initially
}

void loop() {
  // 🔹 Step 1: PIR Sensor check
  int pirValue = digitalRead(PIR_PIN);

  if (pirValue == HIGH) {
    Serial.println("Motion detected → Lid Open");
    myServo.write(90);   // Lid open
    delay(5000);         // 5 sec open
    myServo.write(0);    // Lid close
  }

  // 🔹 Step 2: Ultrasonic distance check
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  int duration = pulseIn(ECHO_PIN, HIGH);
  int distance = duration * 0.034 / 2;

  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  delay(500);
}