/* Hello Wokwi! */
#define PIN_TRIG 3
#define PIN_ECHO 2
#define SPEAKER_PIN 11
#include "pitches.h"

#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 20, 4);

int LED_red = 7;
int LED_green = 6;

int i = 0;

void setup() {
  Serial.begin(115200);
  pinMode(PIN_TRIG, OUTPUT);
  pinMode(PIN_ECHO, INPUT);
  pinMode(LED_red, OUTPUT);
  pinMode(LED_green, OUTPUT);
  pinMode(SPEAKER_PIN, OUTPUT);

  lcd.init();
  lcd.backlight();

  
}

void playSound() {
  tone(SPEAKER_PIN, NOTE_E4);
  delay(150);
  tone(SPEAKER_PIN, NOTE_G4);
  delay(150);
  tone(SPEAKER_PIN, NOTE_E5);
  delay(150);
  tone(SPEAKER_PIN, NOTE_C5);
  delay(150);
  tone(SPEAKER_PIN, NOTE_D5);
  delay(150);
  tone(SPEAKER_PIN, NOTE_G5);
  delay(150);
  noTone(SPEAKER_PIN);
}

void reset(){
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("HAPPY HALLOWEEN!");
  delay(3000);
}

void loop() {
  // Start a new measurement:
  digitalWrite(PIN_TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(PIN_TRIG, LOW);

  // Read the result:
  int duration = pulseIn(PIN_ECHO, HIGH);
  int distanceCM = duration / 58;
  
  lcd.setCursor(1, 0);
  lcd.print("Item in the box");

  if (distanceCM <= 100){
    digitalWrite(LED_red, LOW);
    digitalWrite(LED_green, HIGH);
    Serial.println();
    Serial.println("distanceCM <= 100");
    Serial.print("Item in box: ");
    Serial.println(i);
    i += 1;
    delay(1000);
  }
  if (i == 6){
    digitalWrite(LED_red, HIGH);
    digitalWrite(LED_green, LOW);
    lcd.setCursor(6, 1);
    lcd.print("Full");
    playSound();
    
    reset();
    i = 0;
    lcd.clear();
  }
  if (distanceCM >= 100){
    Serial.println();
    Serial.println("distanceCM >= 100");
    digitalWrite(LED_red, LOW);
    digitalWrite(LED_green, HIGH);
  }  
  Serial.print("Item in box: ");
  Serial.println(i);
  lcd.setCursor(7, 1);
  lcd.print(i);
}