RGB LED only showing red colour

Other Hardware LEDs and Multiplexing
1

I wanted to use a RGB led with arduino. I programmed it that it should change colour in one second 1st red, 2nd green, 3rd blue. But it is showing only red.

Circuit connection:
RGB gnd (long leg) to arduino GND
RGB 1st pin (Red) to arduino 9 using 220ohm resistor
RGB 3rd pin(Green) to 10 using 220ohm
RGB 4rd pin (blue) to 11 using 220ohm

Code

int red = 9
int green = 10
int blue = 11

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

The problem may be in your code that we cannot see

3

Sorry I forgot to mention code, You can see now, the question is edited

4

Is it showing red all the time or is red on for 1 second and off for 2 seconds ?

What changes if you swap the connections to pins 9 and 10 or pins 9 and 11 ?

5

Can you get all colours if you manually connect respectful LED pin to vdd via resistor?

7

The other two pins don't work only the red is working. I want to know that is the led is working or what could have cause it to malfunction

8

You haven’t mentioned any potentiometer, where did this come from? Show circuit diagram

9

The code has nothing in it related to a potentiometer and this is the first time that you have mentioned it

Please post a schematic of your project. A picture of a hand drawn circuit is good enough