int counter; //cria uma variável do counter do estado do programa

#define B1 3 //define os botões
#define B2 4

#define ENTER 5 //define o botão de enter

#define L1 8 //define os leds
#define L2 9
#define L3 10

#define LE1 11 //define os leds de acesso
#define LE2 12
#define LE3 13

void setup() {
  // put your setup code here, to run once:

pinMode(B1, INPUT); //setup dos botões
pinMode(B2, INPUT);

pinMode(ENTER, INPUT); //setup do botão de enter

pinMode(L1, OUTPUT); //setup dos leds 
pinMode(L2, OUTPUT);
pinMode(L3, OUTPUT);

pinMode(LE1, OUTPUT); //setup dos leds de acesso
pinMode(LE2, OUTPUT);
pinMode(LE3, OUTPUT);

Serial.begin(9600); //inicia o monitor serial
}

void loop() {
  // put your main code here, to run repeatedly:

// setando o counter
int EB1 = digitalRead(B1); //cria a variável estado dos botões
int EB2 = digitalRead(B2);

if (EB1==1){ //se o B1 for apertado

  if (counter < 3){
  counter = counter+1;
  Serial.println(counter);
  delay(150);
  }
  else{
  counter = counter;
 }
}
if (EB2==1){ //se o B2  for apertado

  if (counter > 1){
  counter = counter-1;
  Serial.println(counter);
  delay(150);
  }
  else{
  counter = counter;
  }
}
//-------------------------------------------------//
// usando o counter
int EstENTER = digitalRead(ENTER);

if (counter == 1){
  if (EstENTER == 1){
     digitalWrite(L1, LOW);
     digitalWrite(L2, LOW);
     digitalWrite(L3, LOW);
     digitalWrite(LE1, HIGH);
     digitalWrite(LE2, LOW);
     digitalWrite(LE3, LOW);
  }
  else{
    digitalWrite(L1, HIGH);
    digitalWrite(L2, LOW);
    digitalWrite(L3, LOW);
    digitalWrite(LE1, LOW);
    digitalWrite(LE2, LOW);
    digitalWrite(LE3, LOW);

  }
}
if (counter == 2){
  if (EstENTER == 1){
     digitalWrite(L1, LOW);
     digitalWrite(L2, LOW);
     digitalWrite(L3, LOW);
     digitalWrite(LE1, LOW);
     digitalWrite(LE2, HIGH);
     digitalWrite(LE3, LOW);
  }
  else{
    digitalWrite(L1, LOW);
    digitalWrite(L2, HIGH);
    digitalWrite(L3, LOW);
    digitalWrite(LE1, LOW);
    digitalWrite(LE2, LOW);
    digitalWrite(LE3, LOW);

  }
}
if (counter == 3){
  if (EstENTER == 1){
     digitalWrite(L1, LOW);
     digitalWrite(L2, LOW);
     digitalWrite(L3, LOW);
     digitalWrite(LE1, LOW);
     digitalWrite(LE2, LOW);
     digitalWrite(LE3, HIGH);
  }
  else{
    digitalWrite(L1, LOW);
    digitalWrite(L2, LOW);
    digitalWrite(L3, HIGH);
    digitalWrite(LE1, LOW);
    digitalWrite(LE2, LOW);
    digitalWrite(LE3, LOW);

  }
}

}