CarLock.c

// Car Lock for PIC16F84A
// With EXT OSC 4Mhz

static int time = 0;
static int x = 0;

static int locked = 0;
static int unlocked = 0;

const int interval = 20;

const float inTimeSec = 0.65;
const int inTime = inTimeSec * 1000;
const float outTimeSec = 3.7;
const int outTime = outTimeSec * 1000;

const int inTimeCheck = inTime / interval;
const int outTimeCheck = outTime / interval;

int current = 0;

int enabled = 0;

int pressed = 0;

void lock()
{
  x = 0;
  PORTB.B5 = 1;
  locked = 1;

  PORTB.B6 = 0;
  unlocked = 0;

  enabled = 0;
  current = 1;
  // pressed = 1;
}

void unlock()
{
  x = 0;
  PORTB.B6 = 1;
  unlocked = 1;

  PORTB.B5 = 0;
  locked = 0;

  enabled = 0;
  current = 2;
  // pressed = 1;
}

void main()
{
  TRISB = 0b00000110;

  do
  {
    if (PORTB.B1 == 1 && PORTB.B2 == 1 && enabled == 1 && current != 1) // Check Lock
    {
      time++;

      if (time >= inTimeCheck)
      {
        time = 0;
        lock();
      }
    }
    else if (PORTB.B1 == 0 && PORTB.B2 == 0 && enabled == 1 && current != 2) // Check Unlock
    {
      time++;

      if (time >= inTimeCheck)
      {
        time = 0;
        unlock();
      }
    }
    else if (locked == 1 || unlocked == 1)
    {
      x++;

      if (x >= outTimeCheck)
      {
        locked = 0;
        unlocked = 0;
        PORTB = 0x00;
        x = 0;
      }
    }
    else if (PORTB.B1 == 0 && PORTB.B2 == 1)
    {
      pressed = 0;
      current = 0;
      time = 0;
      PORTB = 0x00;
    }
    // else
    // {
    //   PORTB = 0x00;
    //   time = 0;
    // }

    Delay_ms(interval);
    enabled = 1;
  } while (1);
}