from machine import Pin
from time import sleep

led1 = Pin(2, Pin.OUT)
led2 = Pin(4, Pin.OUT)
led3 = Pin(15, Pin.OUT)
led4 = Pin(12, Pin.OUT)

ledds = [led1, led2, led3, led4]

bt1 = Pin(23, Pin.IN, Pin.PULL_UP)
bt2 = Pin(21, Pin.IN, Pin.PULL_UP)
bt3 = Pin(19, Pin.IN, Pin.PULL_UP)


while True:
    if bt1.value() == 0:
        for i in ledds:
            i.on()
            sleep(0.5)
        for i in ledds:
            i.off()
    if bt2.value() == 0:
        for i in ledds:
            i.on()
        for i in ledds:
            sleep(0.5)
            i.off()
    if bt3.value() == 0:
        for i in ledds:
            i.on()
        sleep(0.5)
        for i in ledds:
            i.off()