from machine import Pin
from time import sleep_ms

led01 = Pin(18, Pin.OUT)
led02 = Pin(19, Pin.OUT)
led03 = Pin(21, Pin.OUT)
led04 = Pin(22, Pin.OUT)
led01.off()
led02.off()
led03.off()
led04.off()
while True:
  sleep(0.5)
  led01.value(not led01.value())
  led02.value(not led02.value())
  led03.value(not led03.value())
  led04.value(not led04.value())
from machine import Pin
from time import sleep_ms
led01 = Pin(16, Pin.OUT); led02 = Pin(17, Pin.OUT); led03 = Pin(18, Pin.OUT); led04 =
Pin(19, Pin.OUT)
t_ms = [1000,500,250,100,50]
cnt = i = 0
led01.on(); led02.on(); led03.on(); led04.on()

while True:
 sleep_ms(t_ms[i])
 led01.value(not led01.value())
 led02.value(not led02.value())
 led03.value(not led03.value())
 led04.value(not led04.value())
sleep_ms(t_ms[i])
 print(cnt, end=",")
 cnt = cnt + 1
 if cnt == 5:
 cnt = 0
 print(">",i)
 print("------------------")
 i += 1
 if i > 4:
 i = 0