#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

#define Start 7
#define Stop 8
#define Reset 9

int cont = 0;
LiquidCrystal_I2C lcd(0x27,16,2);

void Interface(){
  lcd.setCursor(0,0);
  lcd.print("___Cronometro___");
}

void setup()
{
  lcd.init();
  lcd.backlight();

  pinMode(Start, INPUT_PULLUP);
  pinMode(Stop, INPUT_PULLUP);
  pinMode(Reset, INPUT_PULLUP);

  Interface();
} 


void loop()
{
  lcd.setCursor(0,1);
  lcd.print(cont);

  if(digitalRead(Start) == 0){

    while(digitalRead(Stop) == 1){
      cont++;
      lcd.setCursor(0,1);
      lcd.print(cont);
      delay(100);

      if(digitalRead(Reset) == 0){
        cont = 0;
        lcd.clear();
          Interface();
        break;
      }
    }
  }

  if(digitalRead(Reset) == 0){
    cont = 0;
    lcd.clear();
    Interface();
  }
}