from machine import Pin 
from time import sleep
#code steup

entry_btn = Pin(34,Pin.IN)
exit_btn = Pin(35,Pin.IN)
leds = [Pin(2,Pin.OUT),Pin(4,Pin.OUT),Pin(21,Pin.OUT),Pin(13,Pin.OUT),Pin(14,Pin.OUT),Pin(16,Pin.OUT),Pin(17,Pin.OUT),Pin(18,Pin.OUT)]

full_led=Pin(19,Pin.OUT)
power_led =Pin(15,Pin.OUT)
error_led = Pin(25,Pin.OUT)

#code

count = 0 
power_led.value(1)
try:
 while True:
   if count >= 8 :
    count = 8       
   entry_btnv = None
   entry_btnv = entry_btn.value() 
   if entry_btnv == 1:
    if count == 8: 
        count -= 1 
    sleep(0.1)  
    leds[count].value(1)
    count += 1
    sleep(0.1)
   sleep(0.1)                 
   if count == 8: 
     full_led.value(1)
   else:
    full_led.value(0)  
   exit_btnv = None
   exit_btnv = exit_btn.value()
   
   if exit_btnv == 1 : 
      sleep(0.1)
      if count > 0:
        count -= 1               
        leds[count].value(0) 

#errors handling       
except Exception as e :
    print(e)
    for i in range(4):
        error_led.value(0)
        sleep(0.5)
        error_led.value(1)
        sleep(0.5)
        error_led.value(0)
        sleep(0.5)
        error_led.value(1)