MultipleButtonLEDControl.ino

// Update this to reflect the amount of LEDs and buttons you want to control
const int LEDCount = 3;
// This array is for tracking all of the values for each LED and button pair
// The first value is the LED pin
// The second value is the button pin
// The third value is the "last button state" which is set LOW by default in setup
// but is also set here as to echo that default state
// The fourth value is "current button state" also set low by default in this array's objects
// Finally the last value represent the millis() at the time the button was pressed so that
// the debounce timer can be calculated per button
// You will need to add an object per pair {LED, BUTTON, BUTTON_LAST_STATE, BUTTON_CURRENT_STATE, LED_STATE, MILLIS_WHEN_BUTTON_WAS_PRESSED}
int pinsAndButts[LEDCount][6] = {
  {12, 9, LOW, LOW, LOW, 0},
  {11, 8, LOW, LOW, LOW, 0},
  {10, 7, LOW, LOW, LOW, 0}
};
// Debounce timer value
unsigned long debounceDelay = 50;
void setup() {
  // this setup loop is for setting the initial state of all the buttons and LEDs
  for (int ledPinPair = 0; ledPinPair < LEDCount; ledPinPair++) {
    int LEDPin = pinsAndButts[ledPinPair][0];
    int buttonPin = pinsAndButts[ledPinPair][1];
    pinMode(LEDPin, OUTPUT);
    pinMode(buttonPin, INPUT);
    digitalWrite(LEDPin, LOW);
    digitalWrite(buttonPin, LOW);
  }
}

void loop() {
  for (int readingPin = 0; readingPin < LEDCount; readingPin++){
    int LEDPin = pinsAndButts[readingPin][0];
    int buttonPin = pinsAndButts[readingPin][1];
    int readingPinVal = digitalRead(buttonPin);
    int buttLastState = pinsAndButts[readingPin][2];
    pinsAndButts[readingPin][3] = readingPinVal;
    int buttCurrState = readingPinVal;
    int LEDState = pinsAndButts[readingPin][4];
    unsigned long lastDebounceTime = pinsAndButts[readingPin][5];
    if (readingPinVal != buttLastState) {
      pinsAndButts[readingPin][5] = millis();
    };
    if ((millis() - lastDebounceTime) > debounceDelay) {
      if (readingPinVal != buttLastState) {
        pinsAndButts[readingPin][2] = readingPinVal;
        if (buttLastState == HIGH) {
          pinsAndButts[readingPin][4] = !pinsAndButts[readingPin][4];
        }
      }
    }
    pinsAndButts[readingPin][2] = buttCurrState;
    digitalWrite(LEDPin, LEDState);
  }
  delay(10);
}