<div dir="ltr">I think the best solution would be to use a data acquisition device, either USB or PCI.<div><br></div><div>Measurement computing sell relatively cheap devices, e.g. this USB one for $99:</div><div><a href="http://www.mccdaq.com/usb-data-acquisition/USB-1024-Series.aspx">http://www.mccdaq.com/usb-data-acquisition/USB-1024-Series.aspx</a></div>
<div><br></div><div><a href="http://www.mccdaq.com/usb-data-acquisition/USB-1024-Series.aspx"></a>can measure 24 digital channels (you could get two if you need 30).</div><div><br></div><div>Each "competitor" could have a small switch, which connects their input line to say a 5V power supply.</div>
<div><br></div><div>You can then write a very simple program to detect when each competitor presses their switch</div><div>(with sub-millisecond accuracy!).</div><div><br></div><div>These devices apparently have linux support.</div>
<div><br></div><div>Jason<br><br><div class="gmail_quote">On Wed, Apr 6, 2011 at 2:44 PM, yosi yarchi <span dir="ltr"><<a href="mailto:yosi.yarchi@gmail.com">yosi.yarchi@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Hi all<br>
<br>
<br>
I need application that will be able to collect and process inputs from 30 (!) competitors, and will display the results very fast. The ideal solution could be to collect the inputs via SMS: each competitor send his answer, the application collect the answers (related to phone number) and process them. However, I can't assume that the competitors have mobile phones (they may be little childs...).<br>
<br>
<br>
I thought to use 30 USB numerical keyboards as input devices, connected with cables to 3 hubs, connected to the computer.<br>
<br>
However, I don't have experience with USB drivers at linux...<br>
<br>
<br>
Is it feasible? What should be the main guidelines for the solution?<br>
<br>
<br>
With best regards<br>
<br>
Yosi Yarchi<br>
<br>
<br>
<br>
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</blockquote></div><br><br clear="all"><br>-- <br>Jason Friedman<br>Postdoctoral scholar<br>Macquarie Centre for Cognitive Science<br>Macquarie University, NSW 2109 Australia<br>email: <a href="mailto:write.to.jason@gmail.com" target="_blank">write.to.jason@gmail.com</a><br>
web: <a href="http://curiousjason.com" target="_blank">http://curiousjason.com</a><br>
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