4teclas 6leds

// Teste leds + Teclado
// Configurando os pinos:

    //LEDS
const int leD6    =  8;      // the number of the LED pin
const int leD5    =  9;      // the number of the LED pin
const int leD4    =  10;      // the number of the LED pin
const int leD3    =  11;      // the number of the LED pin
const int leD2    =  12;      // the number of the LED pin
const int leD1    =  13;
   //Botoes
const int K4      =  A0;     // the number of the pushbutton pin
const int K3      =  A1;     // the number of the pushbutton pin
const int K2      =  A2;     // the number of the pushbutton pin
const int K1      =  A3;     // the number of the pushbutton pin

   //Energia Botoes
const int tecl    =  A4;     // the number of the pushbutton pin

// variables will change:
int ledstate = LOW;         // variable for reading the pushbutton status
unsigned long previousMillis = 0;

void setup() {
    pinMode(leD1, OUTPUT);
    pinMode(leD2, OUTPUT);
    pinMode(leD3, OUTPUT);
    pinMode(leD4, OUTPUT);
    pinMode(leD5, OUTPUT);
    pinMode(leD6, OUTPUT);

    pinMode(K1, INPUT);
    digitalWrite(K1, HIGH);
    pinMode(K2, INPUT);
    digitalWrite(K2, HIGH);
    pinMode(K3, INPUT);
    digitalWrite(K3, HIGH);
    pinMode(K4, INPUT);
    digitalWrite(K4, HIGH);

    pinMode(tecl, OUTPUT);

    digitalWrite(tecl, LOW);

}

void loop() {

    if (digitalRead(K1) == LOW) {
    digitalWrite(leD1, HIGH);
    }
      else {
         // turn LED off:
         digitalWrite(leD1, LOW);
    }

      if (digitalRead(K2) == LOW) {
    digitalWrite(leD2, HIGH);
    }
      else {
         // turn LED off:
         digitalWrite(leD2, LOW);
    }

      if (digitalRead(K3) == LOW) {
    digitalWrite(leD3, HIGH);
    }
      else {
         // turn LED off:
         digitalWrite(leD3, LOW);
    }


      if (digitalRead(K4) == LOW) {
    digitalWrite(leD4, HIGH);
    }
      else {
         // turn LED off:
         digitalWrite(leD4, LOW);
    }


   unsigned long currentMillis = millis();

  if(currentMillis - previousMillis >= 500) {
    previousMillis = currentMillis;

    if (ledstate == LOW)
      ledstate = HIGH;
    else
      ledstate = LOW;

   digitalWrite(leD5, ledstate);
   digitalWrite(leD6, !ledstate);

  }

}