from machine import Pin
import time

red = Pin(1, Pin.OUT)
green = Pin(2, Pin.OUT)
blue = Pin(6, Pin.OUT)

while True:
  red.on()
  print('Red ON')
  time.sleep(2)
  red.off()
  green.on()
  print('Green ON')
  time.sleep(2)
  green.off()
  blue.on()
  print('Blue ON')
  time.sleep(2)
  blue.off()