import machine
import utime

red_led = machine.Pin(0,machine.Pin.OUT)
yellow_led = machine.Pin(2,machine.Pin.OUT)
green_led = machine.Pin(5,machine.Pin.OUT)

while True:
    red_led.value(1)
    utime.sleep(2)

    yellow_led(1)
    utime.sleep(1)

    red_led.value(0)
    yellow_led.value(0)

    green_led.value(1)
    utime.sleep(2)

    green_led.value(0)

    yellow_led.value(1)
    utime.sleep(1)

    yellow_led.value(0)