'''
  Wokwi | questions
  Tracks: Embedded SystemsObjective: 
  Objective:
  In this task, you will simulate a smart entry-exit monitoring 
  system for License renewal unit by designing an Embedded system. 
  You will make a Python and Wokwi simulation. The system tracks 
  how many cars inside the office by simulating push-button presses 
  at the entrance and exit gates. The current number of cars is 
  displayed using 3 LEDs connected to a simulated ESP32 board. 
  You will write a Python script (sensor.py) to manage this logic 
  and submit a Wokwi simulation and a screenshot of the connected
  components.

  Yara May 7, 2025 — 4:54 PM
'''

import time
import machine
from machine import Pin

in_button  = Pin(23, Pin.IN, Pin.PULL_UP)
out_button = Pin(22, Pin.IN, Pin.PULL_UP)

led_pins = [21, 19, 18, 5, 17, 16, 4, 15]
leds = [Pin(pin, Pin.OUT) for pin in led_pins]

car_count = 0

print("\nCar counter\n")

def update_leds(count):
  for i in range(8):
    if i < count:
      leds[i].value(1)
    else:
      leds[i].value(0)

while True:

  if in_button.value() == 0:
    if car_count < 8:
      car_count += 1
      update_leds(car_count)
      print ("Car IN,  count: ", car_count)
    else:
      print("Lot full")
    time.sleep(.5)

  if out_button.value() == 0:
    if car_count > 0:
      car_count -= 1
      update_leds(car_count)
      print ("Car OUT, count: ", car_count)
    else:
      print("Lot empty")
    time.sleep(.5)