const int BLED=9 ;
const int GLED=10 ;
const int RLED=11 ;
const int BUTTON=2 ;
boolean lastButton = LOW;
boolean currentButton = LOW;
int ledMode = 0 ;
void setup()
{
  pinMode (BLED, OUTPUT) ;
  pinMode (GLED, OUTPUT) ;
  pinMode (RLED, OUTPUT) ;
  pinMode (BUTTON, INPUT) ;
}
/*
* Debouncing Function
* Pass it the previous button state.
*/
boolean debounce (boolean last)
{
  boolean current = digitalRead (BUTTON) ;
  if (last != current)
  {
    delay (5) ;
    current = digitalRead (BUTTON) ;
  }
  return current;
}
/*
* LED Mode Selection
* Pass a number for the LED state and set it accordingly.
*/
void setMode (int mode)
{
  //RED
  if (mode == 1)
  {
    digitalWrite (RLED, HIGH) ;
    digitalWrite (GLED, LOW) ;
    digitalWrite (BLED, LOW) ;
  }
  //GREEN
  else if (mode == 2)
  {
   digitalWrite (RLED, LOW) ;
   digitalWrite (GLED, HIGH) ;
   digitalWrite (BLED, LOW) ;
  }
  //BLUE
  else if (mode == 3)
  {
    digitalWrite (RLED, LOW) ;
    digitalWrite (GLED, LOW) ;
    digitalWrite (BLED, HIGH) ;
  }
  //PURPLE (RED+BLUE
  else if (mode == 4)
  {
    analogWrite (RLED, 127) ;
    analogWrite (GLED, 0) ;
    analogWrite (BLED, 127) ;
  }
  //TEAL (BLUE+GREEN)
  else if (mode == 5)
  {
    analogWrite (RLED, 0) ;
    analogWrite (GLED, 127) ;
    analogWrite (BLED, 127) ;
  }
  //ORANGE (GREEN+RED)
  else if (mode == 6)
  {
    analogWrite (RLED, 127) ;
    analogWrite (GLED, 127) ;
    analogWrite (BLED, 0) ;
  }
  //WHITE (GREEN+RED+BLUE)
  else if (mode == 7)
  {
    analogWrite (RLED, 85) ;
    analogWrite (GLED, 85) ;
    analogWrite (BLED, 85) ;
  }
  //OFF (mode = 0)
  else
  {
    digitalWrite (RLED, LOW) ;
    digitalWrite (GLED, LOW) ;
    digitalWrite (BLED, LOW) ;
  }
}
void loop ()
{
  currentButton = debounce(lastButton) ;
  if (lastButton == LOW && currentButton == HIGH)
  {
    ledMode++;
  }
  lastButton = currentButton;
  //if you've cycled through the different options,
  //reset the counter to 0
  if (ledMode == 8)
  {
  ledMode = 0 ;
  }
  setMode (ledMode) ;
}