RGB LED will not work.

Using Arduino LEDs and Multiplexing
1

I am fairly new to Arduino, and I am not quite used to it yet. I have hooked up a RGB LED to my brand new Arduino Uno, and it will only glow red. I have it connected to pins 11, 10, and 9 with 330 Ohm resistors between the LED and the board. This is the code I used. I don't think anything is wrong with it, but I may be wrong.

int RED = 11;
int GREEN = 10;
int BLUE = 9;

void setup() {
  pinMode(RED, OUTPUT);
  pinMode(GREEN, OUTPUT);
  pinMode(BLUE, OUTPUT);
}

void loop() {
  digitalWrite(RED, HIGH);
  delay(1000);
  digitalWrite(RED, LOW);
  
  digitalWrite(GREEN, HIGH);
  delay(1000);
  digitalWrite(GREEN, LOW);
  
  digitalWrite(BLUE, HIGH);
  delay(1000);
  digitalWrite(BLUE, LOW);
}
2

Few questions...
How is your RGB LED wired up. (Relevant to next question)
Is the RGB LED a common anode or common cathode device. (Effects how the device works with arduino)
What are the specifications for the LED (Forward voltage etc) or supply a link to the device you have. (Is the LED suitable for direct control from arduino)

3

The code looks OK, must be a problem with the wiring (but I can't see it from here...)

4

That sounds like you have not got three rsistors going to the anodes with the cathode to ground for a common cathode LED. Or three resistors connected to the cathodes with the anode going to +5V for a common anode display.

That result is what you get when you try and shair one resistor for three LEDs.

5

My LED came in an Arduino starter kit from radio shack. I'm not sure if it is common cathode or common anode. I assumed it was common cathode. I a 330 Ohm resistor connected to pins 11, 10, and 9. The resistors then connect to what I assumed were three separate anodes. I had the remaining lead connected to the ground pin.

6

Well it sounds like you are doing things correctly, time for a photograph of your setup. Please make it under 1000 pixels wide and sharp.