#include <Servo.h>
Servo servo;
int buzzer = 7;
void setup() {
  pinMode(12, INPUT); //PIR sensor
  pinMode(2, OUTPUT); // trig
  pinMode(3, INPUT); //echo
  pinMode(5, OUTPUT); //led
  pinMode(buzzer, OUTPUT); //buzzer
  servo.attach(9);
  Serial.begin(9600);
}

void loop() {
  long duration, distance;
  digitalWrite(2, LOW);
  delayMicroseconds(2);
  digitalWrite(2, HIGH);
  delayMicroseconds(10);
  digitalWrite(2, LOW);


  duration = pulseIn(3, HIGH);


  distance = (duration / 2) / 29.1;

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


  if (distance > 10) {
    Serial.println("Close Dustbin.");
    servo.write(90);
  } else {
    servo.write(0);
    Serial.println("Dustbin Opened.");
  }
  if (digitalRead(12) == HIGH) {
    digitalWrite(5, HIGH);
    Serial.println("Dustbin is Full.");
    tone(buzzer, 200);
  }
  else {
    digitalWrite(5, LOW);
    Serial.println("Dustbin is not Full.");
    noTone(buzzer);
  }

  delay(500);
}