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PICList Thread
'IRDA Format'
1997\03\05@180140 by Miller, Steve

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Hello,

Has anyone attempted to do an IRDA data transfer with a PIC?  I am
working on an application where a PIC will be powered by two coin cells.
An IR LED will provide data transmission to a handheld device.   The
IRDA  receivers look interesting as they do not seem to require a
modulated carrier like TV remotes.  IRDA is limited to 1meter and my spec
is only 6 inches so distance is not a problem.  My main problem on
reception is signal level variations.  I am hoping that the AGC circuit
in the IRDA receiver will take care of this.  I could build a receiver
with AGC out of some opamps, but I don't have the time to fuss with it.

Has anyone seen a detailed example of the IRDA waveform?  I know it is a
NRZ inverted format, but I am fuzzy on the START and STOP bits.  Since
this will be a closed system, I do not have to fully follow the spec.  I
just need to be close enough that the IRDA parts will operate in my
devices.

Thanks for your help.

----- Steve

1997\03\06@034810 by Gvran Mvrk

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Miller, Steve wrote:

 Hello,

 Has anyone attempted to do an IRDA data transfer with a PIC?  I am
 working on an application where a PIC will be powered by two coin
 cells.
  An IR LED will provide data transmission to a handheld device.
 The
 IRDA  receivers look interesting as they do not seem to require a
 modulated carrier like TV remotes.  IRDA is limited to 1meter and my
 spec
 is only 6 inches so distance is not a problem.  My main problem on
 reception is signal level variations.  I am hoping that the AGC
 circuit
 in the IRDA receiver will take care of this.  I could build a
 receiver
 with AGC out of some opamps, but I don't have the time to fuss with
 it.

 Has anyone seen a detailed example of the IRDA waveform?  I know it
 is a
 NRZ inverted format, but I am fuzzy on the START and STOP bits.
 Since
 this will be a closed system, I do not have to fully follow the
 spec.  I
 just need to be close enough that the IRDA parts will operate in my
 devices.

 Thanks for your help.

  ----- Steve

The main difference to RS232 is that the ones (pulses) have a lenght of
3/16 of a bit to conserve power and that it is half duplex. The bit rate
should not be less than 9600 b/s although some mfgrs allow 2400. Take a
look the Temic website, http://www.temic.de.Unless you require 115 kb/s it
should be easy to implement a soft IRDA UART with a PIC, preferably with
interrupt.
Goeran Moerk
spam_OUTgmTakeThisOuTspamsysinno.se

1997\03\06@053553 by Cheng Tan

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On Wed, 5 Mar 1997, Miller, Steve wrote:

{Quote hidden}

Yes, the IrDA is a good design for IR coms, I got the in just a few days
including learning the physical layer. You will not have any problem for
transmission distance of least than one meter. I am using the Crystal
CS8130 chip for the job. I belief the HSDL-1001 by HP will do the job as
well.

If you go to my hompage, you will get more info on it.

CH TAN

1997\03\07@110411 by Jeffrey Wingen

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part 0 6 bytes
Jeff

1997\03\10@052644 by Jeffrey Wingen

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part 0 5 bytes
JTW

1997\03\10@102204 by Mike

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At 02:20 AM 10/03/97 -0800, you wrote:
>IrDA info., specs, and links can also be found at http://www.irda.org.
>
>JTW
>
>Attachment Converted: D:\WAN\MAIL\INCOMING\ReIRDAFo
>

Why do we keep getting the above attachments - please reconfigure you email
program...

Rgds

Mike

Some say there is no magic but, all things begin with thought then it becomes
academic, then some poor slob works out a practical way to implement all that
theory, this is called Engineering - for most people another form of magic.
                                                                      Massen

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