>         I need to comunicate an 16F627 with another 16F627, using infrared
> technology (maybe or not IRDA compatible)
>         I was planning to use MAX3100 and/or MAX3120, but are to costly
for the
> project.
>         As a cheaper way of doing this, can I directly connect an infrared
led to
> TX and an infrared detector to RX on both devices ??
>         Is it right ? Another way of doing so ?

That can work in a tightly controlled environment, like inside a box.  One
of our current projects uses this method to send from a stationary to a
rotating board.

However, you don't want to do this if unknown ambient light can shine on the
receiver.  The IR communication modules use a carrier usually from 35KHz to
50KHz.  The carrier is modulated to encode bits, which are wrapped in
packets with checksums.  All this keeps unknown external illumination from
appearing like a valid signal.


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Embed Inc, embedded system specialists in Littleton Massachusetts
(978) 742-9014, http://www.embedinc.com

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