from machine import Pin
import time,random
ledRed=Pin(27,Pin.OUT)
ledGreen=Pin(28,Pin.OUT)
ledYellow=Pin(26,Pin.OUT)
ledBlue=Pin(22,Pin.OUT)
button2=Pin(2,Pin.IN,Pin.PULL_UP)
button3=Pin(3,Pin.IN,Pin.PULL_UP)

def turn_leds(randomvalue):
    #turn off all leds
    ledRed.off()
    ledGreen.off()
    ledYellow.off()
    ledBlue.off()
    print (randomvalue)
    #turn on the proper led
    if randomvalue==1:
        ledRed.on()
    if randomvalue==2:
        ledGreen.on ()
    if randomvalue==3:
        ledYellow.on()
    if randomvalue==4:
        ledBlue.on()
#main loop
while True:
    i=0
    while(button2.value()):
        if button3.value():
            i=i+1
        else:
            i=i-1
        if i>4:
            i=0
        if i<0:
            i=4
        turn_leds(i)
        time.sleep(0.25)