from machine import Pin 
from time import sleep 
x=Pin(23,Pin.OUT)
while true
 x.on()
 sleep(0,5)
 x.off()
 sleep(0,5)
from machine import Pin 
from time import sleep
x=Pin(23,Pin.OUT)
y=Pin(22,Pin.OUT)
z=Pin(21,Pin.OUT)
while true
 x.on()
 sleep(1)
 x.off()
 from i in range(2)
  y.on()
  sleep(0,5)
  y.off()
  sleep(0.5)
 z.on()
 sleep(1)
 z.off()