One of the bonus points of using an arduino is that he can just hook up as many keys as he wants, in whatever kind of layout he wants, and then have the arduino appear to be a keyboard. No need for any of this NKRO stuff, even, since the arduino could interpret the keypresses and send the appropriate character/code to the OS, as if he just pushed that key on a normal keyboard! See http://arduino.cc/en/Reference/MouseKeyboard for some info and to see how simple the "make it look like a keyboard to the OS" part is. Quite often as simple as just hacking away at one of the bundled examples, or in this case, that's at least a simple place to start.
The electronics would be dead simple, since there's not that many keys needed. This is all the wiring he'd need to know: http://arduino.cc/en/tutorial/button. Sure, there's no debouncing, but that can be done in either software or hardware once he's got something working as a proof-of-concept. On Fri, Oct 17, 2014 at 7:26 AM, David Rysdam <da...@rysdam.org> wrote: > Paul Beaudet <inof...@gmail.com> writes: > > You might be able to get 7 if one of the keys is a modifier like ctrl alt > > meta or shift > > > > Still likely the keyboard, one adventurous way to check is to open up the > > keyboard and > > see if there is a diode for every key. If not that, well that explains > your > > 3KRO. > > What is great, is that you can probably find one that does, near someones > > trash can. > > Might have to research to find the right models though. > > > > I read this a while back that cleared some of my questions. > > http://blog.komar.be/how-to-make-a-keyboard-the-matrix/ > > > > Unapologetically written by an EE.. might want to skip to the section > > before diode part. > > I'm not an EE but I have taken small roles in some television > productions, so I skimmed and got the gist. The real key is finding the > googleable term "NKRO". > > Looks like these keyboards are about $100-$150. That seems a little > pricey for a fiddling around experiment unless I can find one lying > around somewhere. Alternatively, I see there are some keypads out there > with the diodes to allow 10KRO or NKRO for using with an arduino. > > In a sense that's exactly what he wants, but I suspect that practically > speaking it's going to kill his project since he doesn't know anything > about electronics and I dunno if I want to spend the time being his > hardware engineer. We'll see. > _______________________________________________ > gnhlug-discuss mailing list > gnhlug-discuss@mail.gnhlug.org > http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/ >
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