pedals

[David McFarlane]

Francesco,

Been working on this repsonse for the past couple days...

You will need to get a soldering iron and a multimeter, and have the 
skills to use them, or find & team up with a local electronics 
technician, as this is a bit of a do-it-yourself project.  The first 
time I did this in the 1990s, we had keyboards that still had 
individual mechanical switches for each key, I just opened the 
keyboard case and soldered a pair of wires (from two-conductor 
speaker cable) directly to the desired key switch.  I left about a 
foot (~0.5 m) hanging outside the keyboard and added an inline 3.5mm 
monophone jack to the end.  The foot pedal either came with a 3.5mm 
monophone plug, or I cut off whatever it came with and replaced it 
with a 3.5mm plug myself.

Of course, you will not likely come across those keyboards 
anymore.  But no problem, it just means that you open up the keyboard 
again and patch directly into the keyboard matrix controller, which 
is what I did for a later project (and that time, I drilled a hole in 
the case and mounted a jack right on the keyboard case, very 
neat).  Back then I got some insructions from a web page, but I 
cannot find that right now so you might have to Google around 
yourself -- I found the following that introduce some of the 
principles, http://www.howstuffworks.com/keyboard.htm and
http://pcbheaven.com/wikipages/How_Key_Matrices_Works/ -- if you 
cannot figure out how to do this based on these principles, then you 
should not try this project.

Anyway, once you you have a switch wired into the keyboard, it 
effectively *is* a keypress, so no need for any drivers or Devices or 
ports or anything else.


But really, you would be better off using a PST SRBox.  The SRBox has 
an expansion connector inside that allows you to easily add external 
devices that will then act just as if you pressed buttons on the 
SRBox.  In that case, you will only need to connect two wires from 
the pedal to a mating connector -- the SRBox should come with a 
manual that explains the priciples involved (I have the manual right 
here), or you can purchase PST's SRBox Custom Expansion Kit...  Well, 
I just looked this up now, and for a total of US$640, you can get the 
SRBox (US$450), the Custom Expansion Kit (US$150), *and* a foot pedal 
(US$40), so there you go!  Yes, that is a bit of money, but you will 
find the SRBox handy for many reasons, including better timing 
performance (see PST's measurements at 
http://www.pstnet.com/eprimedevice.cfm ).  But if you want to save 
$150, you can do without the Custom Expansion Kit and just get the 
interfacing components you need from an electronics supplier.

I think that should cover it.

-- David McFarlane


At 10/22/2013 06:28 PM Tuesday, francesco biondi wrote:
>Thanks David for the quick reply!
>
>It seems to me that the Casio option in quite convenient.
>
>At that time we just patched them directly into the keyboard so that
>foot presses looked like a key press, e.g., {F12}.
>
>
>Can you please give me a more detailed explanation?
>
>Since it has a Jack plug, which port should i use? do i need to get 
>an adapter?
>(apologizes, but I am not familiar with this topic at all)
>
>In eprime, which device should i select from AddDevice window?
>
>Thanks,
>
>and still apologizes whether my questions sound stupid.
>
>On Tuesday, October 22, 2013 4:08:59 PM UTC-6, McFarlane, David wrote:
>Francesco,
>
>Years ago we did an experiment using foot pedals, we just used simple
>on-off foot switch pedals from Radio Shack, they do not seem to carry
>them anymore but you can get a glimpse of what I mean at
><http://www.eham.net/reviews/detail/4801>http://www.eham.net/reviews/detail/4801 
>, or see the Casio model at
><http://www.bestbuy.com/site/casio-sp3-keyboard-sustain-pedal/6733588.p>http://www.bestbuy.com/site/casio-sp3-keyboard-sustain-pedal/6733588.p 
>.
>
>At that time we just patched them directly into the keyboard so that
>foot presses looked like a key press, e.g., {F12}.  Alternatively,
>you could just patch these into a PST SRBox and go from there.
>
>-----
>David McFarlane
>E-Prime training
>online: 
><http://psychology.msu.edu/Workshops_Courses/eprime.aspx>http://psychology.msu.edu/Workshops_Courses/eprime.aspx 
>
>Twitter:  @EPrimeMaster 
>(<https://twitter.com/EPrimeMaster>https://twitter.com/EPrimeMaster )
>
>/----
>Stock reminder:  1) I do not work for PST.  2) PST's trained staff
>take any and all questions at 
><https://support.pstnet.com>https://support.pstnet.com , and they
>strive to respond to all requests in 24-48 hours, so make full use of
>it.  3) In addition, PST offers several instructional videos on their
>YouTube channel 
>(<http://www.youtube.com/user/PSTNET>http://www.youtube.com/user/PSTNET 
>).  4) If you do
>get an answer from PST staff, please extend the courtesy of posting
>their reply back here for the sake of others.
>\----
>
>
>At 10/22/2013 04:38 PM Tuesday, francesco biondi wrote:
> >I am about to run an experiment in which I collect foot responses.
> >I have V3 Interact pedals, Windows 7 and no drivers to install the pedals.
> >I could not find any drivers to get the V3 pedals working on my pc.
> >
> >I think I will be purchasing new pedals then.
> >
> >Do you know about / Have any of you already used pedals to run
> >experiments in eprime?
> >
> >If so, can you suggest me a particular brand?
> >
> >Thanks,
> >
> >Francesco

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