Re: TI-H: Simple IR link

To: ti-hardware@lists.ticalc.org
Subject: Re: TI-H: Simple IR link
From: Grant Stockly <gussie@alaska.net>
Date: Sun, 16 Aug 1998 20:17:00 -0800 (AKDT)
Delivered-To: ti-hardware-outgoing@towerguard.unix.edu.sollentuna.se
In-Reply-To: <199808090246.WAA02899@mail.iserv.net>
Reply-To: ti-hardware@lists.ticalc.org


>Andy Johnson (prjohnson@utahlinx.com) wrote:
>
>>
>>I was thinking of a way to make a simple IR link, using RadioShack parts.
>>Here's what I came up with.  Unfortunately, it requires the use of custom
>>software, but that isn't much of a problem.
>>
>>I used a 555 to generate a 40 kHz carrier, controlled by pin 4 on the chip,
>>then ran the output through a transistor into an IR Led.  The receiver is
>>just a GP1U52X (RS 276-137).  I'm not sure about the electronic
>>characteristics of the linkport, but that shouldn't be a big problem to
>>fix.  I've only used one of the calc's wires on each end, allowing one to
>>be used as transmit and the other as receive.  If timing is a problem, the
>>driver software can use transitions instead of pulses (1-0 = 0, 0-1 = 1,
>>you get the idea).  I expect the speed to be around 1200 bps, and range to
>>be about 10 ft, but lenses and high powered LEDs could fix that.
>
>Have you checked out Sami Khawam's website?
>
>http://unet.univie.ac.at/~a9501901/irlink/e_hard.htm

He must not like free stuff...  :\

References:

Re: TI-H: Simple IR link

From: Brian Watson <pilotcar@iserv.net>

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