On Wed, 5 Mar 1997, 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
>
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