/////////////////////////////////////////////////////////////////////////////////////////////////////
/////////////////////// Empregamos milis para facer un blink nun led, e por outro lado //////////////
///////////////////////   activamos de maneira intantanea outro led cun interruptor   ///////////////
/////////////// Se o fixésemos co delay o segundo led non seguiría exactamente ó interruptor  ///////
////////////////////////  xa que pararía o programa durante o delay   ///////////////////////////////

/*Blink without Delay

  Turns on and off a light emitting diode (LED) connected to a digital pin,
  without using the delay() function. This means that other code can run at the
  same time without being interrupted by the LED code.

  The circuit:
  - Use the onboard LED.
  - Note: Most Arduinos have an on-board LED you can control. On the UNO, MEGA
    and ZERO it is attached to digital pin 13, on MKR1000 on pin 6. LED_BUILTIN
    is set to the correct LED pin independent of which board is used.
    If you want to know what pin the on-board LED is connected to on your
    Arduino model, check the Technical Specs of your board at:
    https://www.arduino.cc/en/Main/Products

  created 2005
  by David A. Mellis
  modified 8 Feb 2010
  by Paul Stoffregen
  modified 11 Nov 2013
  by Scott Fitzgerald
  modified 9 Jan 2017
  by Arturo Guadalupi

  This example code is in the public domain.

  http://www.arduino.cc/en/Tutorial/BlinkWithoutDelay
*/

// Declaramos as variables
const int led1 = 13;// the number of the LED pin
const int led2 = 12;
const int interruptor = 7;

// Inicializamos as variables en nivel baixo
int led1State = LOW;
int led2State = LOW;
int val = 0; //val empregaremolo para almacenar o estado do interruptor

// Generally, you should use "unsigned long" for variables that hold time
// The value will quickly become too large for an int to store
unsigned long previousMillis = 0;        // will store last time LED was updated


// constants won't change:
const long interval = 1000;           // interval at which to blink (milliseconds)


void setup() {
  // set the digital pin as output:
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(interruptor,INPUT_PULLUP); // y BOTON como señal de entrada
}

void loop() {
  
  // Nesta parte controlaremos o led 1 coa función milis

  // Controlaremos a diferenza entre o tempo actual e o inicial. E no momento que a diferenza sexa 
  // maior que o intervalo cambiase o valor actual polo inicial de novo, faise outra contaxe e así sucesivamente
  unsigned long currentMillis = millis();

  if (currentMillis - previousMillis >= interval) {
    // save the last time you blinked the LED
    previousMillis = currentMillis;

    // Cambiaremos o estado do led cada vez que entremos neste if, cada vez que se cumpra o tempo do intervalo
    if (led1State == LOW) {
      led1State = HIGH;
    } else {
      led1State = LOW;
    }

    // Escribimos o estado do led 1
    digitalWrite(led1, led1State);
  }


   // Nesta parte controlamos o led 2 co interruptor

    val= digitalRead(interruptor); // Lemos o estado do interruptor 
    digitalWrite(led2, val);   // Escribimos o estado almacenado do interruptor no led 2
  
}