Infrared (IR) Communications Basic Tutorial

**westaust55** · 09-01-2011, 07:52

Attached is a basic tutorial covering the concepts and with some working PICAXE program examples and schematic for Infra Red communications between two PICAXE chips.

The 40X1 program code is representative of that required for X1, X2 and M2 parts (watch your pin IO allocations) for a "Master device.
The 08M program code is representative of a "Slave" device and representative of that for any of the M series parts.

Obviously a lot more can be added including data verification and other encoding schemes but this tutorial was primarily aimed at getting the basics down.

EDIT: See post 3 below for latest version

**Texasclodhopper** · 09-01-2011, 13:20

Dang! The instant I'm thinking about this here you are with a tutorial. I'm digging in right now.

I have a little project for an enclosed area where I need some remote sensors to report activity to a central receiver that will accumulate that data and store it.

PS. westaust55, you have ESP and don't anyone tell him different!

**westaust55** · 10-01-2011, 11:17

With some input from TC, I have also now read through a paper copy which found a number of spelling and grammatical errors. The attached version does not change the programs but corrects errors in the descriptive sections.

EDIT:
New version at Rev C added with corrected heading for section 6.1 as identified by IWP

EDIT2:
New version D added with a few spied typos corrected.

**MFB** · 15-01-2011, 14:58

Thanks for producing such a useful tutorial. Anyone interested in optical communications may also find the following (free) ebook worth downloading. Contains information about operating over extended ranges etc.

http://www.imagineeringezine.com/files/air-bk2.html

**inglewoodpete** · 08-02-2011, 06:07

Just noticed that the heading of section 6.1 is the reverse of what you want. Should be IR Sender or similar.

(I tried to send this as a PM but your 'box is overflowing!)

**westaust55** · 08-02-2011, 10:17

Originally Posted by inglewoodpete

Just noticed that the heading of section 6.1 is the reverse of what you want. Should be IR Sender or similar.

(I tried to send this as a PM but your 'box is overflowing!)

Thanks for picking that up IWP.
New Rev C added at post 3 since I have referred some on the forum to that specific post in recent days

With respect to the PM inbox,
I seem to get so many messages from members (not only newbies) who would better post here where all can see the answers, for the education of all rather than the education of one.
I do occasionally clear out some of the PM's and quickly get more to refill the box.
I do respond to some PM's but many cannot then even bother to reply with a quick "thanks" and a few even then go so far as to post the information given here on the forum as part of their program with no acknowledgment.
I did at one time try posting the questions and answers on the forum and then PM back with a link to the forum post but that did not receive any response either way.

**Phil bee** · 12-06-2011, 11:28

This is just briliant, gives all the information needed by a newbe like myself.
Thank you and more like this would be great I.E. how to use Hpwm to drive an H-Bridge please.