from machine import Pin
from utime import sleep

led_1 = Pin(16,Pin.OUT)
led_2 = Pin(17,Pin.OUT)
led_3 = Pin(18,Pin.OUT)
led_4 = Pin(19,Pin.OUT)
butt = Pin(4,Pin.IN)

while True:
    state = butt.value()
    if state == True:
        led_4.off()
        led_3.off()
        led_2.off()
        led_1.on()
        sleep(2)
        led_1.off()
        led_2.on()
        led_3.off()
        led_4.off()
        sleep(2)
        led_4.off()
        led_3.on()
        led_2.off()
        led_1.off()
        sleep(2)
        led_1.off()
        led_2.off()
        led_3.off()
        led_4.on()
        sleep(2)
        
    else:
        led_1.off()
        led_2.off()
        led_3.off()
        led_4.off()