#include <LiquidCrystal_I2C.h> 
#include <Servo.h>

#define servoPin 3 
#define pirPin 2 
#define redLedPin 10
#define greenLedPin 13
#define triggerPin 12
#define echoPin 11
#define buzPin 7

LiquidCrystal_I2C lcd(0x27, 20, 4);  
Servo myservo;
int servoPos = 0;    // variable to store the servo position
void setup() 
{ 
  Serial.begin(9600); 
  pinMode(triggerPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(pirPin, INPUT);
  pinMode(greenLedPin, OUTPUT); //initialize the Street Lamp pin as an output
  pinMode(redLedPin, OUTPUT); 
  pinMode(buzPin, OUTPUT); 
 
  myservo.attach(3);  // attaches the servo on pin 3 to the servo object
  lcd.init();
  lcd.backlight();
}
void loop()
{ 
  lcd.clear(); 
  digitalWrite(triggerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(triggerPin, LOW);

  float dustBinSpace = (pulseIn(echoPin, HIGH))/58.0; // Calculates the Dust Bin left space in cm

  if(dustBinSpace > 10.0) // Taking 10cm as cutoff Mark to determine DustBin full or empty
  {
    Serial.println("Dust Bin Not Full"); 
    lcd.setCursor(0, 0);
    lcd.print("DustBin Not Full");
    digitalWrite(greenLedPin, HIGH);
    digitalWrite(redLedPin, LOW);
    noTone(buzPin);
  }
  else
  {
    Serial.println("Dust Bin Full"); 
    lcd.setCursor(0, 0);
    lcd.print("DustBin Full");
    digitalWrite(greenLedPin, LOW);
    digitalWrite(redLedPin, HIGH);
    //digitalWrite(buzPin, HIGH);
    tone(buzPin, 10000,500);
  }
  delay(300);

  int pirStatus = digitalRead(pirPin);
  if((pirStatus == HIGH) && (dustBinSpace > 10.0))
  {
    Serial.println("Motion Detected, Opening DustBin Cover"); 
    noTone(buzPin);
    lcd.clear(); 
    lcd.setCursor(0, 0);
    lcd.print("Motion Detect");
    lcd.setCursor(0, 1);
    lcd.print("DustBin Cover");
    lcd.setCursor(0, 2);
    lcd.print("Opening");
    myservo.write(90);    
    delay(5000);   // Opening DustBin Cover only for 5 Seconds
    myservo.write(0);   
    lcd.clear(); 
  }
  else if(pirStatus == HIGH)
  {
    Serial.println("Motion Detected, But DustBin Full"); 
    Serial.println("Please Empty the Dust Bin"); 
    lcd.clear(); 
    lcd.setCursor(0, 0);
    lcd.print("Motion Detect");
    lcd.setCursor(0, 1);
    lcd.print("But DustBin Full");
    lcd.setCursor(0, 2);
    lcd.print("Please Empty DustBin");
    tone(buzPin, 10000,500);
    delay(5000);
  }
  else
  {
    Serial.println("No Motion Detected"); 
  }
}