#define red 12
  #define green 11
  #define blue 10
  char ch;
   void setup()
  {
    Serial.begin(9600);
    pinMode(red, OUTPUT);
    pinMode(green, OUTPUT);
    pinMode(blue, OUTPUT);
    Serial.println("press r /t g /t b /t y /t p /t t /t w /t c /t:");
  }
  void loop()
  {
    if (Serial.available())
    {
      ch=Serial.read();
  if(ch=='r')
  {
      digitalWrite(red, 1);
  digitalWrite(blue, 0);
  digitalWrite(green, 0);
  }
 if(ch=='g')
  {
      digitalWrite(red,0);
  digitalWrite(blue, 0);
  digitalWrite(green, 1);
  }
 if(ch=='b')
  {
      digitalWrite(red,0);
  digitalWrite(blue, 1);
  digitalWrite(green,0 );
  }
   if(ch=='y')
  {
      digitalWrite(red,1);
  digitalWrite(blue, 0);
  digitalWrite(green,1 );
  }
  if(ch=='p')
  {
      digitalWrite(red,1);
  digitalWrite(blue, 1);
  digitalWrite(green,0 );
  }
   if(ch=='t')
  {
      digitalWrite(red,0);
  digitalWrite(blue, 1);
  digitalWrite(green, 1);
  }
 if(ch=='w')
  {
      digitalWrite(red,1);
  digitalWrite(blue, 1);
  digitalWrite(green,1 );
  }
 if(ch=='c')
  {
      digitalWrite(red,0);
  digitalWrite(blue,0);
  digitalWrite(green,0 );
  }
    }
  }