//serial blink onboard LED at pin 13
char val;
int ledPinR = 3;
int ledPinG = 4;
int ledPinB = 5;

void setup(){
  Serial.begin(9600); //initiate serial communication at 9600 baud/sec
  pinMode(3, OUTPUT); //sets pin 3 as output
  pinMode(4, OUTPUT); //sets pin 4 as output
  pinMode(5, OUTPUT); //sets pin 5 as output
}

void loop(){
  if (Serial.available()) {

    val = Serial.read(); //create 'character' datatype variable 'val' 

    if (val == 'r'){ //if 'g' received over serial
      digitalWrite(ledPinR,HIGH); //turn LED ON
    } 
    else if (val == 'g'){ //if 'g' received over serial
      digitalWrite(ledPinG,HIGH); //turn LED ON
    }
    else if (val == 'b'){ //if 'g' received over serial
      digitalWrite(ledPinB,HIGH); //turn LED ON
    }
    else {
      digitalWrite(ledPinR,LOW); //turn LED OFF
      digitalWrite(ledPinG,LOW); //turn LED OFF
      digitalWrite(ledPinB,LOW); //turn LED OFF
  }
  delay(10);
}
}