import time
from machine import Pin
from time import sleep
time.sleep(1) # Wait for USB to become ready

#oef1
led_groen=Pin(18,Pin.OUT)
led_geel=Pin(21,Pin.OUT)
led_rood=Pin(16,Pin.OUT)
leds=[led_rood,led_groen,led_geel]
"""
for i in range (len(leds)):
        leds[i].value(1)

#oef2
while True:
    for i in range (len(leds)):
        leds[i].value(1)
    sleep(1)
    for x in range (len(leds)):
        leds[x].value(0)
    sleep(1)
"""
"""
#oef3 
while True:
    for led in leds:
        led.value(1)  
        sleep(0.2)
        led.value(0)
"""
#oef4

from random import randint
"""
while True:
    x=randint (0,len(leds)-1)
    leds[x].value(1)
    sleep(1)
    leds[x].value(0)
    sleep(1)

#uitber
def alles_doven(ledjes):
    for i in range (len(ledjes)):
        leds[i].value(0)
    sleep(1)
while True:
     x=randint (0,len(leds)-1)
     leds[x].value(1)
     sleep(1)
     alles_doven(leds)

"""

#oefeningen Drukknop
knop1=Pin(15,Pin.IN,Pin.PULL_UP)
knop2=Pin(12,Pin.IN,Pin.PULL_UP)

#oef2
"""
while True:
    if knop2.value()==0:
        led_rood.value(1)
    else:
        led_rood.value(0)
    if knop1.value()==0:
        led_groen.value(1)
    else:
        led_groen.value(0)
"""
#oef3
while True:
    if knop2.value()==0:
        led_geel.value(1)
    elif:
        led_geel.value(1)