IrDA
http://www.irda.org/ The home of the IRDA standards organization, somewhat
messy, but they do provide the standards free for downloading. The narrow
IrDa pulses use a pulse for every bit "1" on the RS232 interface and keep
low for "0" bits, that's simple and easy, it requires a good sync, a pulse
shaper and the decoding at the receiver. There are some standards, as the
pulse width to be a percentage of the RS232 pulse.
There's an application note entitled "IrDA-Compliant Transmitter/ Receiver,"
with lots of detail about the standard, at the SHARP web site,
http://www.sharpmeg.com/datasheets/rf-ir/#0 and data sheets at
http://www.sharpmeg.com/datasheets/rf-ir/#4

IR Remotes
http://www.hut.fi/~then/electronics.html#irremote
http://www.ziplabel.com/cir/ computer controlled IR remote control
http://www.geocities.com/SiliconValley/Sector/3863/uir/index.html and
interface_description.html
http://www.rentron.com/project03.htm - excellent
http://www.xs4all.nl/~jwasys/diy4.html - IR Remote extension by phone line
IR Proximity Detection
http://www.seattlerobotics.org/guide/infrared.html

RS232 <> IR
MAXIM MAX3130.. DOES RS232 AND IR.
http://www.elmelectronics.com/Products/Connect/Connect.htm RS232

IR standards?
http://149.170.200.3/Physics/Acorn/About.html For a linux driver, see
http://www.thp.uni-koeln.de/~rjkm/lirc/lirc.tar.gz
ftp://ftp.armory.com./pub/user/rstevew/IR/
http://www.misty.com/~don/irfilter.html - filters

James Newton, webmaster http://get.to/techref
(hint: you can add your own private info to the techref)
mailto:jamesnewton@geocities.com
1-619-652-0593 phone



-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@mitvma.mit.edu]On Behalf Of Nick Taylor
Sent: Friday, September 17, 1999 9:24 AM
To: PICLIST@mitvma.mit.edu
Subject: Re: Decoding LEGO remote control


In light of the underwhelming lack of response to my LEGO IR post,
maybe I need to clarify a little:

The RCX tower and the LEGO remote control (#9738) both transmit a
38kHz carrier which is modulated at a 2400bps rate.  The encoding
is 8 data bits, odd parity, 1 stop bit, noninverted.  I've also
found Kekoa's RCX opcodes page.

What I would like is help in using a PIC (or a Stamp) to decode the
output of an IR receiver that is receiving opcodes from the LEGO
controller.  Lacking that, pointers to using a PIC for decoding TV
IR remotes would help.

Thanks,
 - Nick -

Nick Taylor wrote:
>
> Hello All - -
>
> I'm interested in using a LEGO IR remote control to control other
> things besides the RCX.  Has anyone here done any PIC development
> along these lines?
>
> I would like to use a PIC to decode the output of a Sharp GP1U581Y
> and convert the 16 LEGO control sequences to a single hex nibble.
>
> Any help or pointers will be greatly appreciated.
>
> Thanks,
>  - Nick -