From mboxrd@z Thu Jan 1 00:00:00 1970 From: Maciej Grela Date: Sat, 06 Jan 2007 09:05:06 +0000 Subject: Re: wireless keyboard interaction Message-Id: <200701061005.06902.thermal@o2.pl> List-Id: References: <27d8a6b3aa6e28a87f0a.20070105190625.whnafynlgba@www.dslextreme.com> In-Reply-To: <27d8a6b3aa6e28a87f0a.20070105190625.whnafynlgba@www.dslextreme.com> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable To: linux-hotplug@vger.kernel.org On sobota, 6 stycznia 2007 04:06, juanslayton@dslextreme.com wrote: > This post may be misdirected. If so, I'd appreciate a pointer to an > appropriate forum. > > My application polls 20 keyboards for an elementary school classroom, > printing the output of each keyboard to its own area of a common > projected display. (Thanks to Linas Vepstas for earlier help in > getting past the 32 event limit in the stock kernel.) With > hard-wired USB boards it works beautifully. However, wireless boards > interact in bizarre ways. Sometimes a keypress on one board will > inhibit reading a keypress on a second board; sometimes the > interaction will cause a burst of repeat characters; sometimes > simultaneously pressing keys on two boards will inhibit both. All > interactions seem confined to a short interval after the first > keypress--an interval that is suspiciously close to the autorepeat > delay time. > It seems to me that you`re having interference between radio signals=20 sent by different keyboards. Are they Bluetooth keyboards or simple 27=20 MHz ? Are they all identical ? Have you tried switching channels ? When=20 you put a bunch of wireless keyboards in a room working at the same=20 frequency you can be sure that weirdness will occur. --=20 Maciej Grela counter.li.org: 319794 ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=3Djoin.php&p=3Dsourceforge&CID=DEVD= EV _______________________________________________ Linux-hotplug-devel mailing list http://linux-hotplug.sourceforge.net Linux-hotplug-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel