Universal Infra Red control

N

N_Cook

Guest
I'm aware of
LIRC - linux infrared remote control project
http://www.lirc.org/
but
a/ over the decades I've learnt and forgotten Fortran, CP/M, various
flavours of DOS, win 3.1 etc and don't really wish to have to learn another.
b/ Still needs a hardware implementation for a r/c for a piece of kit rather
than tying up a learning mode "universal" r/c. So I intend playing with some
4000 CMOS series, monostables with 10 turn pots, counters and thumbwheel
switches for a proper universal IR transmitter.

Looking at the LIRC archive there seems to be specious accuracy in the
figures, AFAIK 10 percent timing error-band is about the norm for domestic
r/c (not complex ones) so they can use ceramic resonators rather than
quartz.
eg LIRC gap 46,229 uSec for their particular one tested, scope trace of
order 45uS +/- 1 uSec below , I'm assuming is the complete block repeat
timing.

Starting from a known quantity for a JVC r/c, I have sitting around, can
anyone cross-correlate the LIRC data to oscillscope trace view.
From LIRC archive for r/c
name JVC_PQ21953F

LIRC
bits 16
flags SPACE_ENC|NO_HEAD_REP|CONST_LENGTH
eps 30
aeps 100

header 8488 4126
one 590 1508
zero 590 462
ptrail 590
gap 46229
min_repeat 2
toggle_bit 0


begin codes
# setting A-VCR
operate 0x000000000000C2D0

for the "operate" button only , for simplicity here

SCOPE

From scope simple timings/accuracy without using a frequency counter , but
could do so if more accuracy is required
carrier frequency 40KHz , 25uS period
full code repeats after 45uS
code pulses of order 0.5mS to 0.6mS duration
ident code at 0,2,4,5,6,7,8 mS ie 101011111 (same for all button pushes)
"operate" code starts at 10mS and code reads
1101011011111 as on the screen ie first on the left
(varies on button pushed )
I could not find the meaning of eps , aeps, ptrail etc
Whatever way of, reading/inverting/adding unseen zeros, the scope-read
"operate" pattern, I cannot get hex code C2D0
 
meaning of aeps etc on
http://winlirc.sourceforge.net/technicaldetails.html
just leaves unravelling the hex
 
N_Cook wrote:
I'm aware of
LIRC - linux infrared remote control project
http://www.lirc.org/
but
a/ over the decades I've learnt and forgotten Fortran, CP/M, various
flavours of DOS, win 3.1 etc and don't really wish to have to learn another.
b/ Still needs a hardware implementation for a r/c for a piece of kit rather
than tying up a learning mode "universal" r/c.
Click to expand...
<snip>

FWIW, I have used old Palm IIIX PDAs as custom remote controls; there is
a large and growing database of device codes and the available software
includes learning and manual programming and button placement features.

Michael
 
N_Cook wrote:
b/ Still needs a hardware implementation for a r/c for a piece of kit rather
than tying up a learning mode "universal" r/c. So I intend playing with some
4000 CMOS series, monostables with 10 turn pots, counters and thumbwheel
switches for a proper universal IR transmitter.
Click to expand...
I was interested in IR remotes at one point and built a
4000 series device to synchronously capture a digital input
at 46 KHz and convert it to asych RS-232 data. The design
and schematic are here:
http://www.linuxtoys.org/1bitla/1bitla.html

Hope it helps.... might at least give you some ideas for a
new design.


Bob Smith
 
Bob Smith <usenet@linuxtoys.org> wrote in message
news:4A5A0C20.7020505@linuxtoys.org...
N_Cook wrote:
b/ Still needs a hardware implementation for a r/c for a piece of kit
rather
than tying up a learning mode "universal" r/c. So I intend playing with
some
4000 CMOS series, monostables with 10 turn pots, counters and thumbwheel
switches for a proper universal IR transmitter.

I was interested in IR remotes at one point and built a
4000 series device to synchronously capture a digital input
at 46 KHz and convert it to asych RS-232 data. The design
and schematic are here:
http://www.linuxtoys.org/1bitla/1bitla.html

Hope it helps.... might at least give you some ideas for a
new design.


Bob Smith
Click to expand...

I would have thought that somewhere out there would be a schematic for a
universal r/c transmitter for exercising / hacking r/c-absent equipment.
There are 2 "operate" codes for that JVC r/c one, I relayed before was for
the TV setting and
1101011011111
for VCR setting but I cannot turn that into hex C2D0 either, with lost
zeros/rotation/inversion
the ident code is the same
 
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