Thread: One button to have two values.

So what value is stored in key when the key is up?

How is construct() called? Is it in a loop in your main(), or is it called directly as a result of a completed ADC conversion event?

Finite-state machine - Wikipedia, the free encyclopedia
Basically, you have two events, key-press and key-release
You also have two states key-up and key-down
So state=key-up and event=key-press takes you to state key-down.

In state key-down, you increment your counter (at some rate).

On the key-release event, you look at the key and the counter, and decide what it all means.

Originally Posted by kim15

How exactly do u do a key state events?

Thanks

The easiest way of doing this is with a switch statement

Code:

switch (state)
{
  case 0:
    if (button_pressed)
    {
      count += (count < 100);
      if (count == 100)
      {
        count = 0;
        state = 1;
      }
      else if (count > 100)
      {
        count = 0;
      }
    }
    else
    {
      count = 0;
    }

    break;

  case 1:
    if (!button_pressed)
    {
      count += (count < 100);
      if (count == 100)
      {
        count = 0;
        state = 0;
      }
    }
    else
    {
      count = 0;
    }

    break;
    
}

Also noticed that I do not take the reading straight away -> I wait for 100 positive readings in a row before I change state.