from machine import Pin

from utime import sleep

print("hello, MCA!")

led1=Pin(15,Pin.OUT)
led2=Pin(2,Pin.OUT)
led2=Pin(0,Pin.OUT)

while True:
    led1.on()
    sleep(0.5)
    led1.off()
    sleep(0.5)
    led2.on()
    sleep(0.5)
    led2.off()
    sleep(0.5)
    led3.on()
    sleep(0.5)
    led3.off()
    sleep(0.5)