from machine import Pin,Timer
from time import sleep

pin_LED1 = Pin(21,Pin.OUT)
pin_LED2 = Pin(12,Pin.OUT)
myTimer1 = Timer(1)
myTimer2 = Timer(2)

def toggle_led1(myTimer1):
    pin_LED1.on()
    sleep(0.5)
    pin_LED1.off()
    sleep(0.5)

def toggle_led2(myTimer2):
    pin_LED2.on()
    sleep(0.5)
    pin_LED2.off()
    sleep(0.5)

myTimer1.init(period=1000, mode=Timer.ONE_SHOT, callback=toggle_led1)
myTimer2.init(period=1500, mode=Timer.ONE_SHOT, callback=toggle_led2)
while True:
    sleep(1)
    print('just sleeping here')