Arduino-Volume-Controller/src/main.cpp

#include <Arduino.h>
#include <constants.h>
#include <potControlls.h>
#include <ledControlls.h>
#include <userFunctions.h>

int maxVolume = 64;
int userVolume = 64;
int oldUserVolume = userVolume;

int buttonState;
int lastButtonState = LOW;
unsigned long lastDebounceTime = 0;
unsigned long debounceDelay = 50;

bool debounceRead(int buttonPin);

void setup()
{
  pinMode(LED_HIGH, OUTPUT); // Green
  pinMode(LED_MED, OUTPUT);  // Red LED (D4)
  pinMode(LED_LOW, OUTPUT);  // Green LED

  pinMode(BTN_STAFF_UP, INPUT);  // SW1
  pinMode(BTN_STAFF_DWN, INPUT); // SW2

  // RF Receiver
  pinMode(REMOTE_A, INPUT); // Remote Button A
  pinMode(REMOTE_B, INPUT); // Remote Button B
  pinMode(REMOTE_C, INPUT); // Remote Button C
  pinMode(REMOTE_D, INPUT); // Remote Button D

  pinMode(POT_CS, OUTPUT); // D10 - CS
  pinMode(POT_UD, OUTPUT); // D9 - U/D
  digitalWrite(POT_CS, HIGH);
  digitalWrite(POT_UD, LOW);

  for (int i = 0; i < 64; i++)
  {
    potIncrement();
  }
}

void loop()
{
  updateLeds(maxVolume);

  // SW1 - Staff Volume Up
  if (!debounceRead(BTN_STAFF_UP))
  {
    if (maxVolume < 100)
    {
      maxVolume += STAFF_STEPS;
    }
  }

  // SW2 - Staff Volume Down
  if (!debounceRead(BTN_STAFF_DWN))
  {
    if (maxVolume > STAFF_STEPS)
    {
      maxVolume -= STAFF_STEPS;

      if (userVolume > maxVolume)
      {
        for (int i = 0; i < (userVolume - maxVolume); i++)
        {
          potDecrement();
        }

        userVolume = maxVolume;
        oldUserVolume = userVolume;
      }

      if (oldUserVolume > maxVolume)
      {
        oldUserVolume = maxVolume;
      }
    }
  }

  // Remote D - Mute
  if (debounceRead(REMOTE_D))
  {

    // Check if we are in a muted state
    if (oldUserVolume > userVolume)
    {
      // This is if the user is muted and is asking to be unmuted
      // Check if max volume has been lowered since mute
      if (oldUserVolume > maxVolume)
      {
        // If the max volume has been lowered since mute, then set the user volume to the new max volume
        userVolume = maxVolume;

        for (int i = 0; i < maxVolume; i++)
        {
          potIncrement();
        }
      }
      else
      {
        // If the max volume hasn't changed then, or the old user volume is lower than the new max - restore it to where it was
        userVolume = oldUserVolume;

        for (int i = 0; i < oldUserVolume; i++)
        {
          potIncrement();
        }
      }
    }
    else
    {
      // This is if the user is unmuted and is aksing to be muted
      for (int i = 0; i < 64; i++)
      {
        potDecrement();
      }

      oldUserVolume = userVolume;
      userVolume = 0;
    }
  }

  // Remote A - Significantly Lower Volume
  if (debounceRead(REMOTE_A))
  {
    lowerVolume(&userVolume, &oldUserVolume, maxVolume);
  }

  // Remote B - Volume Up
  // Make sure we are not is a state of mute or lowered
  if (debounceRead(REMOTE_B) && !(oldUserVolume > userVolume))
  {
    volumeUp(&userVolume, &oldUserVolume, maxVolume);
  }

  // Remote C - Volume Down
  if (debounceRead(REMOTE_C) && !(oldUserVolume > userVolume))
  {
    volumeDown(&userVolume, &oldUserVolume);
  }
}

bool debounceRead(int buttonPin)
{
  int reading = digitalRead(buttonPin);

  // If the switch changed, due to noise or pressing:
  if (reading != lastButtonState)
  {
    // reset the debouncing timer
    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)
    {
      buttonState = reading;

      if (buttonState == HIGH)
        return true;
      else
        return false;
    }
  }

  // save the reading. Next time through the loop, it'll be the lastButtonState:
  lastButtonState = reading;

  return false;
}