from machine import Pin  
from time import sleep   

red_pin = Pin(4, Pin.OUT)     
green_pin = Pin(0, Pin.OUT)   
blue_pin = Pin(2, Pin.OUT)    

def sub_rgb_led():
    # LED states: 0 = ON, 1 = OFF
    # YELLOW = Red + Green ON
    red_pin.value(0)       # Red ON
    green_pin.value(0)     # Green ON
    blue_pin.value(1)      # Blue OFF
    sleep(0.5)             # Wait 0.5 seconds

    # CYAN = Green + Blue ON
    red_pin.value(1)       # Red OFF
    green_pin.value(0)     # Green ON
    blue_pin.value(0)      # Blue ON
    sleep(0.5)             # Wait 0.5 seconds

    # MAGENTA = Red + Blue ON
    red_pin.value(0)       # Red ON
    green_pin.value(1)     # Green OFF
    blue_pin.value(0)      # Blue ON
    sleep(0.5)             # Wait 0.5 seconds 


while True:             
    sub_rgb_led()