Wireless RS232 IR... - Electronic Circuits Projects Diagrams Free

Morkai · 18th March 2006, 02:14 AM

Hello there everyone, I'm new to this forum, found it while googling stuff for a school project.

I'm doing a project in my telecommunications course, and wanted to ask for some help and what not. :P
Razz

I am trying to build an Infrared Transmitter and receiver that will take an RS-232 signal, convert it into TTL, then Pulse Width Modulation would be applied, and then finally transmitted. On the reciever side, basically extracting the orignal TTL signal from the Pulse Width Modulated signal and converting it back to RS-232.

I already know how to convert from RS-232 to TTL, and i've been trying to find information on PWM and IR, and found some articles and schematics.

I wanted to know if anyone could recommend how I should approach this, or tell me of any links or sites with some good information.

I'm mainly concerned about the Pulse Width Modulation, modulating the TTL signal and demodulating it.

Any help would be great! Thanks!

akg · 18th March 2006, 05:16 AM

this is same as transmission from TV remote. u'll need a start and stop signal
and RZ format with pulse width modulation,
may these sites help u
http://www.epanorama.net/links/irremote.html
http://www.linuxtoys.org/xirrc/xirrc.html
http://www.armory.com/~spcecdt/remote/

**Nigel Goodwin** · 18th March 2006, 09:26 AM

Check my PIC tutorials for IR transmission and reception, it could easily be modified for RS232 - bear in mind the many extra bits will slow it considerably!.

19th March 2006, 06:23 AM

Hi,
Heres a good link with everything you need (including good explanations), and its SUPER simple. I used a PIC instead of a BASIC stamp - its pretty much the same, and WAY cheaper and faster.

19th March 2006, 11:35 PM

Whoops. I forgot to put the link in. Here it is! http://www.rentron.com/Infrared_Communication.htm

Morkai · 20th March 2006, 06:17 AM

Thank you guys!

Lots of good information, this should make things a hell of a lot easier. :P

Altough, I'm not sure if I'll use a PIC, but I shall see.

Oznog · 20th March 2006, 09:13 AM

Radio Shack sells IR transceivers as a module. Actually I'm thinking it's a receiver that I remember seeing, a transmitter might just be an IR LED.

It's cheap and would be effective, though it may bypass the steps you wanted to learn about.

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18th March 2006, 02:14 AM	(permalink)
Morkai	Wireless RS232 IR... Hello there everyone, I'm new to this forum, found it while googling stuff for a school project. I'm doing a project in my telecommunications course, and wanted to ask for some help and what not. :P Razz I am trying to build an Infrared Transmitter and receiver that will take an RS-232 signal, convert it into TTL, then Pulse Width Modulation would be applied, and then finally transmitted. On the reciever side, basically extracting the orignal TTL signal from the Pulse Width Modulated signal and converting it back to RS-232. I already know how to convert from RS-232 to TTL, and i've been trying to find information on PWM and IR, and found some articles and schematics. I wanted to know if anyone could recommend how I should approach this, or tell me of any links or sites with some good information. I'm mainly concerned about the Pulse Width Modulation, modulating the TTL signal and demodulating it. Any help would be great! Thanks!

18th March 2006, 05:16 AM	(permalink)
akg	this is same as transmission from TV remote. u'll need a start and stop signal and RZ format with pulse width modulation, may these sites help u http://www.epanorama.net/links/irremote.html http://www.linuxtoys.org/xirrc/xirrc.html http://www.armory.com/~spcecdt/remote/ __________________ Gods own Country Incredible !ndia www.flickr.com/photos/_akg/ "Give a man a fish, and he will eat for a day. Teach that man to fish, and he will eat for a lifetime."

18th March 2006, 09:26 AM	(permalink)
Nigel Goodwin	Check my PIC tutorials for IR transmission and reception, it could easily be modified for RS232 - bear in mind the many extra bits will slow it considerably!. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

19th March 2006, 06:23 AM	(permalink)
hyedenny	Hi, Heres a good link with everything you need (including good explanations), and its SUPER simple. I used a PIC instead of a BASIC stamp - its pretty much the same, and WAY cheaper and faster.

19th March 2006, 11:35 PM	(permalink)
hyedenny	Whoops. I forgot to put the link in. Here it is! http://www.rentron.com/Infrared_Communication.htm

20th March 2006, 06:17 AM	(permalink)
Morkai	Wow... Thank you guys! Lots of good information, this should make things a hell of a lot easier. :P Altough, I'm not sure if I'll use a PIC, but I shall see.

20th March 2006, 09:13 AM	(permalink)
Oznog	Radio Shack sells IR transceivers as a module. Actually I'm thinking it's a receiver that I remember seeing, a transmitter might just be an IR LED. It's cheap and would be effective, though it may bypass the steps you wanted to learn about. __________________ I thought what I'd do was I'd pretend I was one of those deaf-mutes.