from machine import Pin
from time import sleep

teller = 0
led1 = Pin(18, Pin.OUT)
led2 = Pin(17, Pin.OUT)
led3 = Pin(16, Pin.OUT)
led4 = Pin(19, Pin.OUT)
knop1 = Pin(15, Pin.IN)
knop2 = Pin(14, Pin.IN)
oldK1 = 0
oldk2 = 0


while True:
    k1 = knop1.value()
    if k1 == 1 and oldK1 == 0:
        teller += 1
        if teller > 3:
            teller = 3
    oldK1 = k1

    k2 = knop2.value()
    if k2 == 1 and oldK2 == 0:
        teller -= 1
        if teller < 0 :
            teller = 0
    oldK2 = k2
    print(knop1.value(), knop2.value(), teller)

    if teller == 0:
        led1.on()
        led2.off()
        led3.off()
        led4.off()
    if teller == 1:
        led1.off()
        led2.on()
        led3.off()
        led4.off()
    if teller == 2:
        led1.off()
        led2.off()
        led3.on()
        led4.off()
    if teller == 3:
        led1.off()
        led2.off()
        led3.off()
        led4.on()
    sleep(0.2)