#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2); 
unsigned long total_money = 0;
int sanpham [8] = {5000, 10000, 15000, 5000, 10000, 10000, 10000, 10000};
int btn[8] = {2, 3, 4, 5, 6, 7, 8, 9};
int add_finish[8] = {0, 0, 0, 0, 0, 0, 0, 0};
int IR = 10;
int s = 0;
void setup() {
  Serial.begin(115200);
  // put your setup code here, to run once:
  for(int i = 0; i < 7 ; ++i){
    pinMode(btn[i], INPUT_PULLUP);
  }
  pinMode(IR, INPUT_PULLUP);
  lcd.init();                    
  lcd.backlight();
  // lcd.setCursor(2,0);
  // lcd.print("Arduinokit.vn");
  // lcd.setCursor(0,1);
  // lcd.print("Xin chao cac ban");
}

void loop() {
  // put your main code here, to run repeatedly:
read_btn();
}
int dectect_money(){
  int money;
  return money;
}
void read_btn(){
  lcd.setCursor(2,0);
  lcd.print("TIEN DA NHAN");
  lcd.setCursor(0,1);
   Serial.println(digitalRead(btn[0]));
  lcd.print(String(total_money)+ " VND");
  if(digitalRead(btn[0])==0){
    if(add_finish[0]==0){
      total_money += 5000;
      add_finish[0] = 1;
      Serial.println("+5000");
    }
  }
  else{
    add_finish[0] = 0;
  }
  if(digitalRead(btn[1])==0){
    if(add_finish[1]==0){
      total_money += 10000;
      Serial.println("+10000");
      add_finish[1] = 1;
    }
  }
  else{
    add_finish[1] = 0;
  }
  
}