from time import sleep
from machine import Pin 

led_pin = range(11,1,-1)
btn = Pin(16,Pin.IN)
btn2 = Pin(17,Pin.IN)
count=1
while True:
    if btn.value()== 1:
        if count <= 11:
            pin_num = 12 - count
            led = Pin(pin_num, Pin.OUT)
            led.value(1)
            count+=1
            sleep(0.3)
    if btn2.value() == 1:
        if count <= 11:
            pin_num = 12 - count
            led = Pin(pin_num, Pin.OUT)
            led.value(0)
            count-=1
            sleep(0.3)