On Tue, 10 Jun 2003 09:22:40 -0400, you wrote:

>> 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. :-)
>
>Also IR codes have a preamble of "sync" bits that let the receiver auto
>gain circuitry stabalize.  All the codes I've seen also contain some =
sort
>of checksum because the bit error rate is assumed to be significant.  =
The
>real payload data is somewhere in the middle of a burst and might be
>tricky to spot.  You need to look at several different burst.

Most consumer codes do not have checksums, but it is not uncommon for =
receivers to only respond
after seeing 2 correct codes.=20

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