pedals

Tue Oct 29 19:57:30 UTC 2013

John, Very cool!  For US$50 (plus US$5 s/h within USA, US$15 
elsewhere) the MaKey MaKey gizmo acts like a basic external digital 
input board through USB, converting any switch closure into an 
ordinary key press, mouse button press, or mouse movement useable by 
any software that recognizes a USB keyboard or mouse.  I want one of 
these, could come in handy!

Francesco, As it turns out, one of our labs has recently purchased 
USB foot pedals that act like key presses, and they use that with 
E-Prime.  See 
http://www.tomtop.com/usb-foot-control-keyboard-mouse-action-three-switch-pedal-hid-c954.html 
.  Cost is US$34 (plus s/h I suppose).

Both the MaKey MaKey and USB foot pedals should work fine if you do 
not need absolute millisecond timing performance (note in particular 
that the MaKey MaKey page says that they use a moving window averager 
to lowpass switch noise in software, I imagine that might add a bit 
of delay; goodness knows how the USB foot pedals behave).  Otherwise 
users should test input timing characteristics for themselves (use an 
oscilloscope, or a Black Box Toolkit).

I would love to know what you end up with, please write back and let us know.

-----
David McFarlane
E-Prime training 
online:  http://psychology.msu.edu/Workshops_Courses/eprime.aspx
Twitter:  @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 , 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 ).  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 10/27/2013 03:16 AM Sunday, john at johnallen.it wrote:

>Francesco
>
>David's answers are all great, as slways, however if u dont want to 
>spend good money on a response box snd if you'e happy using USB 
>rather than serial port input, then you might like to consider this 
><http://www.makeymakey.com/>http://www.makeymakey.com/
>On first appearance it may appear like a toy but I think you should 
>be able to get it to work for your purpose.
>
>John
>On 25 Oct 2013 18:24, "David McFarlane" 
><<mailto:mcfarla9 at msu.edu>mcfarla9 at msu.edu> wrote:
>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>http://www.howstuffworks.com/keyboard.htm 
>and
><http://pcbheaven.com/wikipages/How_Key_Matrices_Works/>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>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>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>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>http://psychology.msu.edu/Workshops_Courses/eprime.aspx 
>
>Twitter:  @EPrimeMaster 
>(<<https://twitter.com/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>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>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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