Debbie Hynes wrote:

>Just an update on that IR decoding question from yesterday. With sincere thanks
>to all who helped out!
>
>I'm now getting pretty good waveforms captured direct from the IR controller's
>beam into my PC's line i/p & displayed on screen with Cool Edit 2000. See
>attachement irc001.gif which shows the initial few bits.
>
>I've logged the zero crossings, the pulses measure 600 usec wide. They're
>bunched in groups : there's one lot of 8 with 600usec spacing, another lot of 6
>with 600 usec spacing, 2 lots of pairs with 600 usec spacing & the rest come
>singly with approx 2.2msec spacing. I count 33 pulses in all.
>
>I guess next stage is to figure out a subroutine to dupe the sequence. This one
>sez "POWER ON" to a VCR. If the programme works, I'll feel confident to lash
>out on an IR controlled digital cam.
>
Usually, the highs are fixed in length and the lows are one of two lengths.
They are the one's and zero's. Sometimes lows are fixed & highs change.
Create a bit banging serial routine that does them 8 bits at a time but
instead of just highs & lows, you're encoding the short & long marks.
Also, remember that you'll have to do the space between pulse trains &
send the whole sequence at least twice for the equipment to recognise it
as valid data. Do you get what I mean? Hope this helps. :-)
David...

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu