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'[PIC:] Suggestions for fiber optic cable communica'
2003\09\02@212853 by CVT-SSS

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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 )

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2003\09\02@215453 by Ken Pergola

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Hi Augusto,

If you want something easy to work with and COTS then Agilent has some
low-cost modules:

http://www.agilent.com


HFBR-1412
HFBR-2412

Check out all the variants -- I'll let you sort through them all.

Best regards,

Ken Pergola


{Original Message removed}

2003\09\02@220313 by Larry Taylor

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Fiber Optic glass are rated at wave lengths. You need to match the optics to
the LED. If you are less than 3 miles you won't need a Laser LED Diode.
Every connection you make on the glass you will lose apx  .5db of signal. If
you are just playing around with than use what you have, who knows it just
might work. Good Luck!!!
Larry Taylor  KF6JBG
Telecommunications
{Original Message removed}

2003\09\02@220722 by Art

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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:
{Quote hidden}

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2003\09\02@224704 by Dwayne Reid
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At 12:45 PM 9/2/2003, CVT-SSS wrote:
>Hi all,
>
>What kind of source need to use to communicate two pics using a 20 mts.
>optic fiber cable ?

TOSLINK transmitters and receivers should work just fine for this - and
they are cheap.  These are the optical inputs and outputs often seen on
audio equipment.

8 MB/s TX  Digi-Key 425-1100-5-ND  $1.87 @ 10
8 MB/s TX  Digi-Key 425-1108-5-ND  $2.52 @ 10

I also use parts from Industrial Fiber Optic - these have the advantage
that you can just use cut fiber instead of needing that fancy square piece
of plastic (TOSLINK) at the end of the fiber.

But the above transmitters and receiver part numbers are dead simple to use.

dwayne


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2003\09\03@032731 by Luis Moreira

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Hi Augusto
Go with Ken's suggestion of the Agilent modules ( HFBR14X2 and HFBR24X2), I
use them at work all the time as I design fibre optic links and They are the
easiest thing in the world just follow the design advice on the datasheet.
the 24X2 is an open collector receiver so you can just interface it with the
voltage that you require, just watch the  max current.
Any problems just let me know.
regards
               Luis

P.S.- are you Portuguese?

{Original Message removed}

2003\09\03@055528 by Russell McMahon

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For VERY short lengths "plastic" fishing line has been used.
MAY just work at 20m depending on coms speed required.
Probably not, but easily tried.

       RM


> What kind of source need to use to communicate two pics using a 20 mts.
> optic fiber cable ?

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2003\09\08@104523 by Eoin Ross

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Try searching http://www.jameco.com for "Optic" and you will get some
suitable tx/rx parts - and fibre

We use these in a machine we manufacture and they work well. Although
we did spend the money and get the higher output Tx units

>>> @spam@artky1kKILLspamspamUNINETS.NET 02 Sep 03 22:06:06 >>>
<snip>
Mechanical alignment for homebrew for a fiber optic interface is no
picnic
and would not be very rugged or forgiving of bumps:>:
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.
{Quote hidden}

source
>very near ( 1 meter )

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