/*
  Button

  Turns on and off a light emitting diode(LED) connected to digital pin 13,
  when pressing a pushbutton attached to pin 2.

  The circuit:
  - LED attached from pin 13 to ground through 220 ohm resistor
  - pushbutton attached to pin 2 from +5V
  - 10K resistor attached to pin 2 from ground

  - Note: on most Arduinos there is already an LED on the board
    attached to pin 13.

  created 2005
  by DojoDave <http://www.0j0.org>
  modified 30 Aug 2011
  by Tom Igoe

  This example code is in the public domain.

  https://www.arduino.cc/en/Tutorial/BuiltInExamples/Button
*/

// constants won't change. They're used here to set pin numbers:
const int front_limit = 10;  // the number of the pushbutton pin
const int back_limit = 11;
const int dir_change = 12;
const int ledF = 2;    // the number of the LED pin
const int ledB = 3;    // the number of the LED pin
const int ledD = 4;    // the number of the LED pin

byte last_front_limit_State = LOW;
byte last_back_limit_State = LOW;
byte last_dir_change_State = LOW;
byte ledB_State = LOW;
byte ledF_State = LOW;
byte ledD_State = LOW;

void setup() {
  // initialize the LED pin as an output:
  pinMode(ledF, OUTPUT);
  pinMode(ledB, OUTPUT);
  pinMode(ledD, OUTPUT);
    // initialize the pushbutton pin as an input:
  pinMode(front_limit, INPUT);
  pinMode(back_limit, INPUT);
  pinMode(dir_change, INPUT);
}

void loop() {

  byte front_limit_State = digitalRead(front_limit);
  byte back_limit_State = digitalRead(back_limit);
  byte dir_change_State = digitalRead(dir_change);


  if (front_limit_State != last_front_limit_State) {
    last_front_limit_State = front_limit_State;
    if (front_limit_State == HIGH) {
      ledF_State = (ledF_State == HIGH) ? LOW: HIGH;
      digitalWrite(ledF, ledF_State);
 }
  }

  if (back_limit_State != last_back_limit_State) {
    last_back_limit_State = back_limit_State;
    if (back_limit_State == HIGH) {
      ledB_State = (ledB_State == HIGH) ? LOW: HIGH;
      digitalWrite(ledB, ledB_State);
 }
  }

  if (dir_change_State != last_dir_change_State) {
    last_dir_change_State = dir_change_State;
    if (dir_change_State == HIGH) {
      ledD_State = (ledD_State == HIGH) ? LOW: HIGH;
      digitalWrite(ledD, ledD_State);
 }
  }

}