import board
import digitalio

led = digitalio.DigitalInOut(board.GP0)
led.direction = digitalio.Direction.OUTPUT

ledgelb = digitalio.DigitalInOut(board.GP1)
ledgelb.direction = digitalio.Direction.OUTPUT

ledgrün = digitalio.DigitalInOut(board.GP2)
ledgrün.direction = digitalio.Direction.OUTPUT

taster = digitalio.DigitalInOut(board.GP28)
taster.direction = digitalio.Direction.INPUT
taster.pull = digitalio.Pull.DOWN

while True:
    x = 0 
    if taster.value:
        x = x+1
    if led.value:
        x = 1
    if ledgelb.value:
            x = 2
    if ledgrün.value:
            x = 3
    if x > 4:
            x = 0