from machine import Pin
from utime import sleep

yellow_pin = Pin(0, Pin.OUT)
cyan_pin = Pin(2, Pin.OUT)
magenta_pin = Pin(15, Pin.OUT)

def sub_rgb_led():
  yellow_pin.value(1) 
  cyan_pin.value(0) 
  magenta_pin.value(0) 
  sleep(0.5) 
   
  yellow_pin.value(0) 
  cyan_pin.value(1) 
  magenta_pin.value(0) 
  sleep(0.5) 
   
  yellow_pin.value(0) 
  cyan_pin.value(0) 
  magenta_pin.value(1) 
  sleep(0.5)


while True:
    sub_rgb_led()

# the led show the change of colour from yellow,cyan to magenta and be delay for 0.5 second.