import machine
import utime

led_1 = machine.Pin(18, machine.Pin.OUT)
led_2 = machine.Pin(19, machine.Pin.OUT)
led_3 = machine.Pin(20, machine.Pin.OUT)
led_4 = machine.Pin(21, machine.Pin.OUT)

bp_1 = machine.Pin(12, machine.Pin.IN,machine.Pin.PULL_DOWN)
bp_2 = machine.Pin(13, machine.Pin.IN,machine.Pin.PULL_DOWN)
bp_3 = machine.Pin(14, machine.Pin.IN,machine.Pin.PULL_DOWN)
bp_4 = machine.Pin(15, machine.Pin.IN,machine.Pin.PULL_DOWN)

while True:

    if bp_1.value() == 1:
        led_1.value(1)
        led_2.value(1)
        led_3.value(1)
        led_4.value(1)

    if bp_2.value() == 1:
        led_1.value(1)
        led_2.value(0)
        led_3.value(1)
        led_4.value(0)
        utime.sleep(0.3)
        led_1.value(0)
        led_2.value(1)
        led_3.value(0)
        led_4.value(1)
        utime.sleep(0.3)

    if bp_3.value() == 1 :
        led_1.value(1)
        utime.sleep(0.3)
        led_1.value(0)
        led_2.value(1)
        utime.sleep(0.3)
        led_2.value(0)
        led_3.value(1)
        utime.sleep(0.3)
        led_3.value(0)
        led_4.value(1)
        utime.sleep(0.3)
        led_4.value(0) 

    if bp_4.value() == 1 :
        led_4.value(1)
        utime.sleep(0.3)
        led_4.value(0)
        led_3.value(1)
        utime.sleep(0.3)
        led_3.value(0)
        led_2.value(1)
        utime.sleep(0.3)
        led_2.value(0)
        led_1.value(1)
        utime.sleep(0.3)
        led_1.value(0)

    else :
        led_1.value(0)
        led_2.value(0)
        led_3.value(0)
        led_4.value(0)