from machine import Pin
import time

led_red=Pin(1,Pin.OUT)
led_yellow=Pin(9,Pin.OUT)
led_blue=Pin(2,Pin.OUT)
led_purple=Pin(3,Pin.OUT)

while True:
    led_red.value(1)
    time.sleep(1)
    led_red.value(0)

    led_yellow.value(9)
    time.sleep(1)
    led_yellow.value(0)

    led_blue.value(2)
    time.sleep(1)
    led_blue.value(0)

    led_purple.value(3)
    time.sleep(1)
    led_purple.value(0)