#define RED 12
#define GREEN 11
#define BLUE 10
#define BUTTON 7
int val = 0;
int old_val = 0;
int state = 0;
int led = 12;
int newled = 12;


void setup ()
{
  Serial.begin(9600); 
  pinMode (RED, OUTPUT);
  pinMode (GREEN, OUTPUT);
  pinMode (BLUE, OUTPUT);
  pinMode (BUTTON, INPUT);

}


void loop ()
{ 
  val = digitalRead (BUTTON);
   if((val == HIGH) && (old_val == LOW))
   
   {
    newled = led - 1; 
     if (newled == 8) { newled = 12; } 
    led = newled;
    delay(100);
   }
 
  old_val = val;
  
  if (led == 12)
  {
    digitalWrite(RED, HIGH);
    digitalWrite(GREEN, LOW);
    digitalWrite(BLUE, LOW);
    delay (100);
    digitalWrite(RED, LOW);
    delay (100);    
  }
 if (led == 11)
  {
    digitalWrite(RED, LOW);
    digitalWrite(GREEN, HIGH);
    digitalWrite(BLUE, LOW);
    delay (100);
    digitalWrite(GREEN, LOW);
    delay (100);    
  }
 if (led == 10)
  {
    digitalWrite(RED, LOW);
    digitalWrite(GREEN, LOW);
    digitalWrite(BLUE, HIGH);
    delay (100);
    digitalWrite(BLUE, LOW);
    delay (100);    
  } 
 if (led == 9)
  {
    digitalWrite(RED, LOW);
    digitalWrite(GREEN, LOW);
    digitalWrite(BLUE, LOW);
  } 
  
  Serial.print ("LED: ");
  if (led == 12) { Serial.println ("RED"); }
  if (led == 11) { Serial.println ("GREEN"); }
  if (led == 10) { Serial.println ("BLUE"); }
  if (led == 9) { Serial.println ("OFF"); }
}