#include <ESP32Servo.h>
#define PIR_PIN 13
#define ULTRASONIC_TRIG_PIN 12
#define ULTRASONIC_ECHO_PIN 14
#define SERVO_PIN 2
#define LED_PIN 4

Servo myservo;
int distance = 0;

void setup() {
  Serial.begin(9600);
  pinMode(PIR_PIN, INPUT);
  pinMode(ULTRASONIC_TRIG_PIN, OUTPUT);
  pinMode(ULTRASONIC_ECHO_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);

  myservo.attach(SERVO_PIN);
  myservo.write(0); // Initialize servo position
  digitalWrite(LED_PIN, LOW); // Ensure LED is initially off
  }

  void loop() {
    // Check PIR sensor
    int pirState = digitalRead(PIR_PIN);
    if (pirState == HIGH) {
    // Motion detected
    int fillLevel = checkFillLevel();
    Serial.print("Dustbin fill level: ");
    Serial.print(fillLevel);
    Serial.println(" %");

    // Open lid
    openLid();
      delay(5000); // Keep the lid open for 5 seconds
      closeLid(); // Close the lid
    } else {
      checkFillLevel();
      int fillLevel = checkFillLevel();
      Serial.print("Dustbin fill level: ");
      Serial.print(fillLevel);
      Serial.println(" %");
    }
  delay(1000);
    }

  int checkFillLevel() {
  digitalWrite(ULTRASONIC_TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(ULTRASONIC_TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(ULTRASONIC_TRIG_PIN, LOW);

  int duration = pulseIn(ULTRASONIC_ECHO_PIN, HIGH);
  int distance_cm = duration * 0.034 / 2; // Convert duration to distance in cm
  return distance_cm;
  }
  void openLid() {
  for (int pos = 0; pos <= 90; pos += 1) {
    myservo.write(pos);
      delay(10);
  }
  // Missing code here...
  for (int pos = 90; pos >= 0; pos -= 1) {
    myservo.write(pos);
    delay(10);
      }
    }
  }