from machine import Pin, PWM
import time,random 
ledRed=Pin(27,Pin.OUT)
ledGreen=Pin(28,Pin.OUT) 
ledYellow=Pin(26,Pin.OUT)
ledBlue=Pin(22,Pin.OUT)
def turn_leds(randomvalue):
    ledRed.off()
    ledGreen.off()
    ledYellow.off()
    ledBlue.off()
    print(randomvalue)
    if randomvalue==1:
        ledRed.on()
    if randomvalue==2:
        ledGreen.on()
    if randomvalue==3:
        ledYellow.on()
    if randomvalue==4:
        ledBlue.on()
while True:
    for d in range (0,20,2):
        color = random.randint(1,4)
        turn_leds(color)
        time.sleep(1)