For higher data rates, you need a photodiode. The best phototransistors
have 5 us rise and fall times and that's with a big input signal.It's true,
you can get a big signal if you feed it with a fiber optic cable.

Since you have high power RF nearby, would a free space link be suitable
for your ap?

Since you are writing the code for the PIC yourself, the free space link
might be the way to go...especially if you don't need high data rates.

Ebay has the parts for this if you decide to use a free space link.

I once saw a television transmitter that had control functions (in/out) via
an IR LED/PD 2 way link. It was set up like this for high RF immunity and
the entire transmitter end floated at 25 KV. A device similar to a hand
held tv remote control unit worked great.

Mechanical alignment for homebrew for a fiber optic interface is no picnic
and would not be very rugged or forgiving of bumps:>:

Good luck.

Art


At 01:45 PM 9/2/03 -0500, you wrote:
>Hi all,
>
>What kind of source need to use to communicate two pics using a 20 mts.
>optic fiber cable ?
>
>Options that I have on hand to make the test:
>
>1) A Bright LED with a photo transistor
>2) IR emmisor LED and a IR Receiver
>
>Ideas are welcome,
>
>Regards,
>
>Augusto
>
>PD: Copper wires are not a good way because there are a High Power RF source
>very near ( 1 meter )
>
>--
>http://www.piclist.com#nomail Going offline? Don't AutoReply us!
>email listserv@mitvma.mit.edu with SET PICList DIGEST in the body

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body