from machine import Pin
import time

red = Pin(15, Pin.OUT)
green = Pin(14, Pin.OUT)
blue = Pin(4, Pin.OUT)

while True:
    red.value(0)    # Turn Red ON (0 means ON for common anode)
    green.value(1)  # Turn Green OFF
    blue.value(1)   # Turn Blue OFF
    time.sleep(1)

    red.value(1)    # Turn Red OFF
    green.value(0)  # Turn Green ON
    blue.value(1)   # Turn Blue OFF
    time.sleep(1)

    red.value(1)    # Turn Red OFF
    green.value(1)  # Turn Green OFF
    blue.value(0)   # Turn Blue ON
    time.sleep(1)