from machine import Pin 
from time import sleep

push1 = Pin(35 , Pin.IN)
push2 = Pin(25 , Pin.IN)
red = Pin(23, Pin.OUT)
green = Pin(22, Pin.OUT)
yellow = Pin(21, Pin.OUT)
blue = Pin(2, Pin.OUT)
car = 0
while True:

    if car == 15 :
        green.off()
        red.on()
    else:
        green.on ()
        red.off()
    if push1.value() == 1:
        if car < 15:
            yellow.on()
            sleep(0.2)
            yellow.off()
            car = car + 1
    
    elif push2.value() == 1 :
        if car > 0: 
            blue.on()
            sleep(0.2)
            blue.off()
            car = car - 1
    print ("count =", car)