const int pinAd=2; 
const int pinBd=3;
const int pinCd=4;
const int pinDd=5;
const int pinAu=7; 
const int pinBu=8;
const int pinCu=9;
const int pinDu=10;
String inByte = "00";
int numero=0;
const int restar=A0;
const int sumar=A1;
String numerostr="00";


void setup()
{
    pinMode(pinAd,OUTPUT); 
    pinMode(pinBd,OUTPUT);
    pinMode(pinCd,OUTPUT);
    pinMode(pinDd,OUTPUT);
    pinMode(pinAu,OUTPUT); 
    pinMode(pinBu,OUTPUT);
    pinMode(pinCu,OUTPUT);
    pinMode(pinDu,OUTPUT);
    pinMode(restar,INPUT);
    pinMode(sumar,INPUT);
    Serial.begin(9600); //Open the serial port
}

void loop()
{
  if((digitalRead(sumar)==LOW)&&(numero<99))
  {
    numero=numero+1;
    numerostr=String(numero);
    enciende(numerostr);
    Serial.println(numero);
    delay(200);//para detener el loop y que no sume más de 1 al presionar el botón
  }
  if((digitalRead(restar)==LOW)&&(numero>0))
  {
    numero=numero-1;
    numerostr=String(numero);
    enciende(numerostr);
    Serial.println(numero);
    delay(200);
  }
  if(Serial.available() > 0)
  {
        inByte = Serial.readString();; //read the incoming byte
        numero=inByte.toInt();
        Serial.println(numero);
        numerostr=String(numero);
        enciende(numerostr);
  }
}
       
void enciende(String numberstr)
{
        char decenas = numberstr.charAt(0);
        char unidades = numberstr.charAt(1);
        if(numberstr.length()<2)
        {
          unidades=decenas;
          decenas='0';
        }
   
        if(decenas == '0')
        {
            encenderd0();
        }
        else if(decenas == '1')
        {
          encenderd1();
        }
        else if(decenas == '2')
        {
          encenderd2();
        }
        else if(decenas == '3')
        {
          encenderd3();
        }
        else if(decenas == '4')
        {
          encenderd4();
        }
        else if(decenas == '5')
        {
          encenderd5();
        }
        else if(decenas == '6')
        {
          encenderd6();
        }
        else if(decenas == '7')
        {
          encenderd7();
        }
        else if(decenas == '8')
        {
          encenderd8();
        }
        else if(decenas == '9')
        {
          encenderd9();
        }
        if(unidades == '0')
        {
            encenderu0();
        }
        else if(unidades == '1')
        {
          encenderu1();
        }
        else if(unidades == '2')
        {
          encenderu2();
        }
        else if(unidades == '3')
        {
          encenderu3();
        }
        else if(unidades == '4')
        {
          encenderu4();
        }
        else if(unidades == '5')
        {
          encenderu5();
        }
        else if(unidades == '6')
        {
          encenderu6();
        }
        else if(unidades == '7')
        {
          encenderu7();
        }
        else if(unidades == '8')
        {
          encenderu8();
        }
        else if(unidades == '9')
        {
          encenderu9();
        }
}
  

void encenderu0()
{
    digitalWrite(pinAu, LOW);
    digitalWrite(pinBu, LOW);
    digitalWrite(pinCu, LOW);
    digitalWrite(pinDu, LOW);
}

void encenderu1()
{
    digitalWrite(pinAu, HIGH);
    digitalWrite(pinBu, LOW);
    digitalWrite(pinCu, LOW);
    digitalWrite(pinDu, LOW);
}

void encenderu2()
{
    digitalWrite(pinAu, LOW);
    digitalWrite(pinBu, HIGH);
    digitalWrite(pinCu, LOW);
    digitalWrite(pinDu, LOW);
}

void encenderu3()
{
    digitalWrite(pinAu, HIGH);
    digitalWrite(pinBu, HIGH);
    digitalWrite(pinCu, LOW);
    digitalWrite(pinDu, LOW);
}

void encenderu4()
{
    digitalWrite(pinAu, LOW);
    digitalWrite(pinBu, LOW);
    digitalWrite(pinCu, HIGH);
    digitalWrite(pinDu, LOW);
}

void encenderu5()
{
    digitalWrite(pinAu, HIGH);
    digitalWrite(pinBu, LOW);
    digitalWrite(pinCu, HIGH);
    digitalWrite(pinDu, LOW);
}

void encenderu6()
{
    digitalWrite(pinAu, LOW);
    digitalWrite(pinBu, HIGH);
    digitalWrite(pinCu, HIGH);
    digitalWrite(pinDu, LOW);
}

void encenderu7()
{
    digitalWrite(pinAu, HIGH);
    digitalWrite(pinBu, HIGH);
    digitalWrite(pinCu, HIGH);
    digitalWrite(pinDu, LOW);
}

void encenderu8()
{
    digitalWrite(pinAu, LOW);
    digitalWrite(pinBu, LOW);
    digitalWrite(pinCu, LOW);
    digitalWrite(pinDu, HIGH);
}

void encenderu9()
{
    digitalWrite(pinAu, HIGH);
    digitalWrite(pinBu, LOW);
    digitalWrite(pinCu, LOW);
    digitalWrite(pinDu, HIGH);
}

void encenderd0()
{
    digitalWrite(pinAd, LOW);
    digitalWrite(pinBd, LOW);
    digitalWrite(pinCd, LOW);
    digitalWrite(pinDd, LOW);
}

void encenderd1()
{
    digitalWrite(pinAd, HIGH);
    digitalWrite(pinBd, LOW);
    digitalWrite(pinCd, LOW);
    digitalWrite(pinDd, LOW);
}

void encenderd2()
{
    digitalWrite(pinAd, LOW);
    digitalWrite(pinBd, HIGH);
    digitalWrite(pinCd, LOW);
    digitalWrite(pinDd, LOW);
}

void encenderd3()
{
    digitalWrite(pinAd, HIGH);
    digitalWrite(pinBd, HIGH);
    digitalWrite(pinCd, LOW);
    digitalWrite(pinDd, LOW);
}

void encenderd4()
{
    digitalWrite(pinAd, LOW);
    digitalWrite(pinBd, LOW);
    digitalWrite(pinCd, HIGH);
    digitalWrite(pinDd, LOW);
}

void encenderd5()
{
    digitalWrite(pinAd, HIGH);
    digitalWrite(pinBd, LOW);
    digitalWrite(pinCd, HIGH);
    digitalWrite(pinDd, LOW);
}

void encenderd6()
{
    digitalWrite(pinAd, LOW);
    digitalWrite(pinBd, HIGH);
    digitalWrite(pinCd, HIGH);
    digitalWrite(pinDd, LOW);
}

void encenderd7()
{
    digitalWrite(pinAd, HIGH);
    digitalWrite(pinBd, HIGH);
    digitalWrite(pinCd, HIGH);
    digitalWrite(pinDd, LOW);
}

void encenderd8()
{
    digitalWrite(pinAd, LOW);
    digitalWrite(pinBd, LOW);
    digitalWrite(pinCd, LOW);
    digitalWrite(pinDd, HIGH);
}

void encenderd9()
{
    digitalWrite(pinAd, HIGH);
    digitalWrite(pinBd, LOW);
    digitalWrite(pinCd, LOW);
    digitalWrite(pinDd, HIGH);
}