pedals

Tue Oct 29 20:04:06 UTC 2013

Just to clarify that last point, even patching a foot pedal directly 
into the keyboard does not give you the best timing performance, 
because keyboards generally provide only mediocre performance (but 
see http://www.empirisoft.com/directinkb.aspx ).  If you want 
millisecond-quality performance, you need to incorporate something 
like an SRBox, or a high-speed I/O device (e.g., old-fashioned parallel port).

-- David McFarlane

At 10/29/2013 03:57 PM Tuesday, David McFarlane wrote:
>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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