RE: TI-H: Infrared control

To: ti-hardware@lists.ticalc.org
Subject: RE: TI-H: Infrared control
From: Grant Stockly <gussie@alaska.net>
Date: Mon, 3 May 1999 15:05:12 -0800
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In-Reply-To: <001f01be9570$6720c830$41d57aa8@bu.edu>
References: <001e01be9569$f64d0520$62738bce@username.tdstelme.net>
Reply-To: ti-hardware@lists.ticalc.org


>Well, I have my share of universal remotes, but eventually I would
>appreciate testers.
>The range of the port seems to be no more than a foot or so in somewhat
>lighted situations. Apparently infrared works much better in dark
>situations. But that is not really the problem anyway.

It could be a problem with the frequency the receiver or transmitter is
tuned to.

>With regard to regular remote controls being able to communicate with IrDA -
>well, the CE device can read from the remote, and only when a remote button
>is pressed, so there is *something* going on there. The question I have is:
>how do I interpret that something.
>
>Here are some samples:
>Sony stereo:
>-64 -64 -32 -64 -32 0 0 0 -32 0 -64 0 -32
>-64 -64 -32 -64 -32 0 0 0 -32 0 -64 0 -32
>-64 -64 -32 -64 -32 0 0 0 -32 0 -64 0 -32
>-64 -32 -32 -64 -32 0 0 0 -32 0 -64 0 -32
>-64 -32 -32 -64 -32 0 0 0 -32 0 -64 0 -32
>-64 -32 -32 -64 -32 0 0 0 -32 0 -64 0 -32
>-64 -32 -32 -64 -32 0 0 0 -32 0 -64 0 -32
>-64 -32 -64 -64 -32 0 0 0 -32
>(tabulated by me - weird that it is all the same, I pressed random buttons)
>Panasonic TV:
>0 112 -4 112 60 14 -16 56 30 7 112 60 -2 112 60 30 7 112 60 30 7 112 60 30 7
>112 60 30 112 -4 -16 -16 -16 112 60 -2 112 -4 -16 -16 -16 112 -4 -16 0
>112 -4 112 60 14 112 60 30 112 60 30 -1 112 60 14 112 60 30 112 -4 112 60 30
>112 60 30 7 112 -4 -16 -16 -16 112 60 -2 112 -4 -16 -16 -16 112 -4 -16 0
>112 -4 112 60 14 112 60 30 112 60 30
>(These are simply the raw data read in from the IrDA port (treated as a
>serial port, standard Win32 CreateFile(), ReadFile() etc.)
>
>One thing I am considering: Maybe I am not reading from the port fast
>enough? These devices have limited speed, but who knows. Maybe it is too
>slow because I am wasting time refreshing the display each time?


I'd check out the frequency of the transmitter.  Open it up and find the RC
circut.  I doubt there is a crystal.

References:

RE: TI-H: Infrared control

From: "Gearry R. Judkins" <gearry@tdstelme.net>

RE: TI-H: Infrared control

From: "Eilon Lipton" <yoe@mediaone.net>