code

#define DELAY            5  // Delay per loop in ms
 enum PinAssignments
 {
  encoderPinA = 0,
  encoderPinB = 1,
  encoderPinC = 3,
  encoderPinD = 2,

 };
//This is up to your pin wiring

 int encoderPos[] = {0,0};
 static boolean rotating[] = {false,false};

 boolean A_set = false;
 boolean B_set = false;
 boolean C_set = false;
 boolean D_set = false;

void setup()
{
  pinMode(4, INPUT_PULLUP);
  pinMode(A0, INPUT_PULLUP);
  pinMode(A1, INPUT_PULLUP);
  pinMode(A2, INPUT_PULLUP);
  pinMode(A3, INPUT_PULLUP);
  pinMode(A4, INPUT_PULLUP);
  pinMode(A5, INPUT_PULLUP);
  Keyboard.begin();

  pinMode(encoderPinA, INPUT_PULLUP);
  pinMode(encoderPinB, INPUT_PULLUP);
  pinMode(encoderPinC, INPUT_PULLUP);
  pinMode(encoderPinD, INPUT_PULLUP);

  attachInterrupt(0, doEncoderC, CHANGE);
  attachInterrupt(1, doEncoderD, CHANGE);

  attachInterrupt(2, doEncoderA, CHANGE);
  attachInterrupt(3, doEncoderB, CHANGE);

  Serial.begin(9600);
}

void loop() {

  if(digitalRead(4)==LOW){
    Keyboard.press('a');
  }
  if(digitalRead(4)==HIGH){
    Keyboard.release('a');
  }
  if(digitalRead(A0)==LOW){
    Keyboard.press('b');
  }
  if(digitalRead(A0)==HIGH){
    Keyboard.release('b');
  }
  if(digitalRead(A1)==LOW){
    Keyboard.press('c');
  }
  if(digitalRead(A1)==HIGH){
    Keyboard.release('c');
  }
  if(digitalRead(A2)==LOW){
    Keyboard.press('d');
  }
  if(digitalRead(A2)==HIGH){
    Keyboard.release('d');
  }
  if(digitalRead(A3)==LOW){
    Keyboard.press('i');
  }
  if(digitalRead(A3)==HIGH){
    Keyboard.release('i');
  }
  if(digitalRead(A4)==LOW){
    Keyboard.press('f');
  }
  if(digitalRead(A4)==HIGH){
    Keyboard.release('f');
  }
  if(digitalRead(A5)==LOW){
    Keyboard.press('g');
  }
  if(digitalRead(A5)==HIGH){
    Keyboard.release('g');
  }
  //Encoder Reset
  for(int i=0;i<=1;i++)
  {
    rotating[i] = true;
    if (encoderPos[i] != 0)
    {
      if(i==0)  Mouse.move(encoderPos[i],0,0);
      if(i==1)  Mouse.move(0,encoderPos[i],0);

      encoderPos[i] = 0;
    }
  }

  delay(DELAY);
}

void doEncoderA()
{

  if( digitalRead(encoderPinA) != A_set )
  {
    A_set = !A_set;

    if ( A_set && !B_set )
      encoderPos[0] += 1;

    rotating[0] = false;
  }
}

void doEncoderB()
{

  if( digitalRead(encoderPinB) != B_set ) {
    B_set = !B_set;

    if( B_set && !A_set )
      encoderPos[0] -= 1;

    rotating[0] = false;
  }
}

void doEncoderC()
{
  if( digitalRead(encoderPinC) != C_set )
  {
    C_set = !C_set;

    if ( C_set && !D_set )
      encoderPos[1] += 1;

    rotating[1] = false;
  }
}

void doEncoderD()
{
  if( digitalRead(encoderPinD) != D_set ) {
    D_set = !D_set;

    if( D_set && !C_set )
      encoderPos[1] -= 1;

    rotating[1] = false;
  }
}