/*PROJECT - automatic trash bin (for 1st round of technoMind)
  TEAM    - Robo Wizards
  AUTHER  - H.A.Idusha sachintha (the leader of team Robo Wizards)
  CONTACT - whatsapp = 071 5356389  Email = [email protected]
  DATE    - 24/04/2023
  DESCRIPTION,
            This is a automatic trash bin.
            When a person goes in front of the bin lid will be open.
            if the trash bin is full, it will indicate through a Buzzer,LED & LCD display.
            used board is ESP32
            used laguage for coding is C++
  *NOTE
      1. Lid open position angle = 180 degrees
      2. Lid closed position angle = 20 degrees
      3. ultrasonic sensor reading for bin full is distance <= 5cm
*/
#include<ESP32Servo.h> // import servo library for servo
#include <LiquidCrystal_I2C.h> // import the LiquidCrystal_I2C.h library for LCD display

LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27, 16, 2);//setup the LCD display
Servo servo; //make the servo object

#define PIRPin 4 // define a pin to PIR sensor

#define trig 13//define pins for ultrasonic sensor
#define echo 12

#define buzzerPin 27 //define a pin for buzzer
#define LEDPin 14 //define a pin to LED

void setup() {

  // setup PIR sensor pin 
  pinMode(PIRPin, INPUT); 

// setup ultrasonic pins
  pinMode(trig, OUTPUT); 
  pinMode(echo, INPUT); 

// setup buzzer pin
  pinMode(buzzerPin, OUTPUT); 

   // setup LED pin
  pinMode(LEDPin, OUTPUT);

// set a pin to Servo motor
  servo.attach(2); 
  servo.write(0); 

//setup the starting text on LCD display
  LCD.init();
  LCD.backlight();
  LCD.setCursor(2, 0);
  LCD.println("Robo Wizards");
  delay(2000);
  LCD.setCursor(0, 0);
  LCD.println("Automatic trash");
  LCD.setCursor(7, 1);
  LCD.println("bin");
  delay(2000);
  LCD.clear();
  LCD.setCursor(2, 0);
  LCD.println("turning on...");
  delay(2000);
}

void loop() {

  lid_open();
  trash_full_indicte();
  LCD.clear();

}
void lid_open() {
  if (digitalRead(PIRPin) == 1) { //read PIR senser & see whether the PIR sensor is on
    //open the lid
    LCD.clear();
    LCD.setCursor(0, 0);
    LCD.println("LID OPENING...");
    for (int X = 20; X <= 180; X++) {
      servo.write(X);
      delay(10);
    }

    //wait 2 seconds
    LCD.clear();
    LCD.setCursor(0, 0);
    LCD.println("PUT YOUR TRASH");
    delay(3000);

    //close the lid
    LCD.clear();
    LCD.setCursor(0, 0);
    LCD.println("LID closing...");
    for (int X = 180; X > 20; X--) {
      servo.write(X);
      delay(10);

    }
  }
}
void trash_full_indicte() {

  int DISTANCE = 0;
  DISTANCE = ultrasonic();

// indicate bin status
  if (DISTANCE <= 5) {
    LCD.clear();
    LCD.setCursor(0, 0);
    LCD.println("Trash bin full !");
    LCD.setCursor(0, 1);
    LCD.println("CLEAN THE BIN");
  }
  while (DISTANCE <= 5) {

    digitalWrite(LEDPin, HIGH);
    tone(buzzerPin, 1000);
    delay(1000);

    digitalWrite(LEDPin, LOW);
    tone(buzzerPin, 500);
    delay(1000);

    DISTANCE = ultrasonic();
  }
  noTone(buzzerPin);
  //if the trash bin is not full turn off the buzzer
}
//Read the ultrasonic sensor & convert the reading to cm
int ultrasonic() {
  digitalWrite(trig, LOW);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);
  int disvalue = pulseIn(echo, HIGH);
  int distance = disvalue / 2 / 29;
  return distance;
}