From: Maciej Grela <thermal@o2.pl>
To: linux-hotplug@vger.kernel.org
Subject: Re: wireless keyboard interaction
Date: Sat, 06 Jan 2007 09:05:06 +0000 [thread overview]
Message-ID: <200701061005.06902.thermal@o2.pl> (raw)
In-Reply-To: <27d8a6b3aa6e28a87f0a.20070105190625.whnafynlgba@www.dslextreme.com>
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
sent by different keyboards. Are they Bluetooth keyboards or simple 27
MHz ? Are they all identical ? Have you tried switching channels ? When
you put a bunch of wireless keyboards in a room working at the same
frequency you can be sure that weirdness will occur.
--
Maciej Grela <jid:thermal@jabber.wroc.pl>
counter.li.org: 319794
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next prev parent reply other threads:[~2007-01-06 9:05 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-06 3:06 wireless keyboard interaction juanslayton
2007-01-06 9:05 ` Maciej Grela [this message]
2007-01-06 15:34 ` juanslayton
2007-01-06 16:02 ` Vojtech Pavlik
2007-01-06 18:55 ` juanslayton
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