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Re: Wireless keyboard, 4800bps possible?

 wrote:

>Marcus,
>
>>Does anyone know if PS/2 or a Twiddler I needs 9600 ?
>>
>
>Try listening to the serial port and click some keys... If it's sending
>plain ascii down the line then I'd say there'd be no noticable difference.
>It should be pretty obvious what the bandwidth used is like. I suspect there
>will be only 1 character (8 bits) per keyclick, giving you (at 4800 baud),
>600 characters per second (evenly spaced, say 600 potential character
>"slots" per second).
>
That's ot the problem. If  I sample a 9600bps signal (even though it's 
nearly always zero) with 4800bps
I will get about a quarter of all 2 bit combinations wrong (01 and 10 
will become either 00 or 11).

>Nick
>
>----- Original Message -----
>From: "Marcus" <>
>To: <>
>Sent: Friday, January 04, 2002 5:42 AM
>Subject: Re: Wireless keyboard, 4800bps possible?
>
>
>>
>>I have some 4800bps transmiter-receiver -pairs lying around.
>>Does anyone know if PS/2 or a Twiddler I needs 9600 ?
>>I can hook up the receiver directly to a serial/ps/2 port and would
>>not like to have microcontrollers on both ends, just to do
>>a bit-rate conversion.
>>
>>
>>Russell Kohn wrote:
>>
>>>Are you using a full-sized keyboard right now?
>>>
>>>Some people have made DIY chording keyboards, out of normal keyboards.
>>>Could a wireless (RF) keyboard be made into a chording keyboard, without
>>>losing the wireless capability??
>>>Mouse may be harder, but for me, mouse is non-critical.
>>>
>>>On Wed, 2 Jan 2002  wrote:
>>>
>>>:This is exactly the type of situation I am trying to work on/with. I am
>>>:forced to carry a bag around with me almost all of the time. In this
>>>
>bag, I
>
>>>:can carry whatever I need to, be it the board, it's enclosure,
>>>
>batteries, and
>
>>>:transmitters. At the moment I have it set up so that the 5822 is
>>>
>running in
>
>>>:the bag in a large, roughly made aluminum enclosure, and hooked up with
>>>:banana plugs to an old Dell laptop battery. Then, the keyboard and
>>>
>mouse are
>
>>>:hooked up to a wireless keyboard transmitter (RF), and the tv-out is
>>>
>hooked
>
>>>:up to a wireless transmitter, which is hooked up to the tv. What I
>>>
>really
>
>>>:would like to do is get the transmitter to transmit to to my
>>>
>semi-hacked
>
>>>:glasstrons, with a small receiver format. However, I have found that in
>>>
>most
>
>>>:wireless ntsc transmitters, the receiver is the bulkier of the two
>>>:components. Any ideas?
>>>:
>>>:Also, I'd love a wireless twiddler II, but don't have the ability to
>>>
>come up
>
>>>:with anything myself. Any progress? Ideas?
>>>:
>>>:These only obstacles remaining are finishing the glasstron, small
>>>
>wireless
>
>>>:NTSC receiver (low power), and wireless input device that is workable.
>>>
>Both
>
>>>:wireless components would be short range (I am always within ten feet
>>>
>of my
>
>>>:bag).
>>>:
>>>:~patrick
>>>:
>>>:In a message dated 1/2/2002 7:04:16 PM Eastern Standard Time,
>>>: writes:
>>>:
>>>:
>>>:> I carry a bag with me, basically 24/7, so leaving a computer and
>>>
>batteries
>
>>>:> in the bag would make a lot of sense. But I wouldn't want to have
>>>
>cables
>
>>>:> between me and the bag. That would look odd: Sitting at a desk with a
>>>:> cable to my head, and hand from a bag sitting on the floor. So much
>>>
>for
>
>>>:> covert! but if, instead, I had wires from my head and hand to my
>>>
>pocket,
>
>>>:> through my shirt, well, thats much better!
>>>:>
>>>:
>>>:
>>>
>>>--
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>>>
>>
>>
>>--
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>>
>
>--
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>

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