import machine
import random
import time 
from machine import Pin,Timer
print(machine.freq()/(10**6))

led = Pin(1,Pin.OUT)
led = Pin(5,Pin.OUT)
led = Pin(9,Pin.OUT)



timer =Timer()

def blink_led(timer):
    led.on()
    time.sleep(0.5)
    led.off()
    time.sleep(0.5)

timer.init(freq=2,mode=Timer.PERIODIC, callback=blink_red)
time.sleep(20)
led.off()
timer.definit()