debounceRead.ino

/*TO IMPLEMENT: you mast have the following variable names for your button pins:

  hourPin
  minutePin
  setPin
  
  TO USE: 
  if (debounceRead(hourPin))
  {
    hourButtonPressed();
  }

*/
int buttonStates[4] = {LOW, LOW, LOW, LOW};
int lastButtonStates[4];

int buttonState = LOW;      // the current reading from the input pin
int lastButtonState = LOW;  // the previous reading from the input pin
long lastDebounceTime = 0;  // the last time the output pin was toggled
long debounceDelay = 50;    // the debounce time; increase if the output flickers
long lastChange = 0;


bool debounceRead(int pin)
{

  if ((millis() - lastChange) < 200)
  {
    return false;
  }


  switch (pin)
  {
    case hourPin:
    {
      buttonState = buttonStates[0];
      lastButtonState = lastButtonStates[0];
    }
    break;
    case minutePin:
    {
      buttonState = buttonStates[1];
      lastButtonState = lastButtonStates[1];
    }
    break;
    case setPin:
    {
      buttonState = buttonStates[2];
      lastButtonState = lastButtonStates[2];
    }
    break;
    case snoozePin:
    {
      buttonState = buttonStates[3];
      lastButtonState = lastButtonStates[3];
    }
    break;
  }

  int reading = digitalRead(pin);


  if (reading != lastButtonState)
  {
//    Serial.println("reading is different than last button state");
    lastDebounceTime = millis();
  }



  if ((millis() - lastDebounceTime) > debounceDelay)
  {
    // whatever the reading is at, it's been there for longer
    // than the debounce delay, so take it as the actual current state:
    // if the button state has changed:
    if (reading != buttonState)
    {

      Serial.println("Button press successful");
      buttonState = reading;
      lastChange = millis();
      return buttonState;
    }
  }

    lastButtonState = reading;

      switch (pin)
  {
    case hourPin:
    {
      buttonStates[0] = buttonState;
      lastButtonStates[0] = lastButtonState;
    }
    break;
    case minutePin:
    {
      buttonStates[1] = buttonState;
      lastButtonStates[1] = lastButtonState;
    }
    break;
    case setPin:
    {
      buttonStates[2] = buttonState;
      lastButtonStates[2] = lastButtonState;
    }
    break;
    case snoozePin:
    {
      buttonStates[3] = buttonState;
      lastButtonStates[3] = lastButtonState;
    }
    break;
  }
}