debounce time

[Paul Groot]

Hi Tobias,

You're right. Mechanical switches suffer from this debounce effect.
Especially if the switch becomes older! In most cases this is not an
issue if you are only interested in the response time of a single
button press. When repeating presses are allowed, an 'ignore interval'
of about 50 ms should be enough for even the worst switches. Things
become more complicated when several buttons are allowed to be
pressed. An electrical solution using a Schmitt trigger is preferred
in that case (for example:
http://www.labbookpages.co.uk/electronics/debounce.html)

Unfortunately Eprime has no dead-time setting as Presentation does...;-((

best
Paul

2011/7/14 Tobias <tobias.fw at gmail.com>:
> Dear E-Prime community,
>
> I have just received a nice self-made buttonbox with three buttons
> that can be attached to a parallel port. THus I have very good timing
> of RTs for my experiments now :)
>
> However, there seems to be a problem with the bouncing of the keys.
> Single key presses cause several signals in a row. That is, if I have
> two consecutive slides with a duration of "-1", one key press is
> enough to terminate both slides.
>
> A collegue of mine said that in the experimental software
> 'Presentation', a debounce time can be specified so that such double
> responses are not possible.
>
> Is there any way of doing so in E-Prime?
>
> Best,
> Tobias
>
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