from machine import Pin, Timer
from time import sleep

led1= Pin(2,Pin.OUT)
led2= Pin(3,Pin.OUT)
led3= Pin(4,Pin.OUT)

Timer1=Timer(period = 1000, mode=Timer.PERIODIC, callback=lambda t1: led1.value(not led1.value()))
Timer2=Timer(period = 500, mode=Timer.PERIODIC, callback=lambda t2: led2.value(not led2.value()))
Timer3=Timer(period = 250, mode=Timer.PERIODIC, callback=lambda t3: led3.value(not led3.value()))

x=0
try:
    while True:
        print(x)
        sleep(1)
        x+=1
except KeyboardInterrupt:
    Timer1.deinit()
    led1.off()