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// Alat Penghitung Barang Otomatis menggunakan Sensor Inframerah berbasis Arduino UNO
// Mayomi Shafa Feliza 220536610096 
// Najwa Afif Nugraha 220536609096
// Senja Kurniawan 220536601054     

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

int IRPin = 2;
int buzzerPin = 3;
int buttonPin = 4;
int n = 0;
int oldValue = 1;

void setup() {
  // put your setup code here, to run once:
  lcd.init();
  lcd.backlight();

  pinMode(IRPin, INPUT);
  pinMode(buttonPin, INPUT_PULLUP);
  pinMode(buzzerPin, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  lcd.setCursor(0, 0);
  lcd.print("Jumlah Barang: ");

  if (digitalRead(IRPin) == 0 && oldValue == 1) {
    oldValue = 0;
    Count();
  } else if (digitalRead(IRPin) == 1 && oldValue == 0) {
    oldValue = 1;
  }

  if (digitalRead(buttonPin) == 0) {
    Reset();
  }

  delay(10);
}

void Count() {
  n = n + 1;

  lcd.clear();
  lcd.setCursor(0, 1);
  lcd.print(n);

  digitalWrite(buzzerPin, HIGH);
  delay(100);
  digitalWrite(buzzerPin, LOW);
}

void Reset() {
  n = 0;
  lcd.clear();
  lcd.setCursor(0, 1);
  lcd.print(n);

  lcd.setCursor(0, 0);
  lcd.print("RESET");
  
  digitalWrite(buzzerPin, HIGH);
  delay(500);
  digitalWrite(buzzerPin, LOW);
}