Rob Robson:
>For the interest of those who were following this thread in mid-November, I
>wanted to report that I had great success using the
>record-IR-stream-as-audio method posted by David Duffy.  He had proposed
>connecting an IR sensor to the input of a garden-variety sound card and
>using audio editing software to record and view the various codes from
>remote controls.  I actually dismantled the remote control I wanted to
>decode, removed the IR LED,  and connected an audio cable to that point.
>This setup inverted the data twice, so that what resulted on screen was a
>true representation of what my bit-banging routine needed to recreate.  I
>used Cool Edit, which has a convenient time scale below the waveform.
>Zoomed in, this time scale displayed seconds to 4 or 5 decimal places, which
>was more than accurate enough for me to simply calculate the bit durations
>subtractively.  Sure; the SoundBlaster's AC-coupled input made hash out of
>the bit transitions, but for a zero-cost DSS, I'll take it.  Once I had
>finished coding, I was able to view the results by connecting the PIC output
>pin to the SoundBlaster the same way.  This made it a breeze to tweak the
>timing loops.  Maybe I've just been inside too long, but this is a neat
>idea, and my hat's off to whoever first came up with it.

The Delphi program I wrote made this easy as it showed the waveform with one
byte per pixel resolution and has controls to invert it, measure X/Y from
point to
point and even decode the bit stream into bytes based on a number of different
protocols. I can load the waveform, tell it what brand it is, press
'process' and it
gives me a list of byte values. (eg. 13 45 250 6 38) It can also print
waveforms
out one below the other to compare the differences. (eg. original to PIC copy)
It evolved over a year or so as a useful tool and a good programming challenge.
I may get around to doing a new version one day as my programming skills are
a lot better now than when I started that project. I'll probably offer it
as freeware
in due course. http://www.audiovisualdevices.com.au/downloads.html
David...

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