Post by thread:[PIC:] Suggestions for fiber optic cable communica

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 spam_OUTlistservTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body

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}

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

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 -- Dwayne Reid <.....dwaynerKILLspam.....planet.eon.net> Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax Celebrating 19 years of Engineering Innovation (1984 - 2003) .-. .-. .-. .-. .-. .-. .-. .-. .-. .- `-' `-' `-' `-' `-' `-' `-' `-' `-' Do NOT send unsolicited commercial email to this email address. This message neither grants consent to receive unsolicited commercial email nor is intended to solicit commercial email. -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email EraseMElistservspam_OUTTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body

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}

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 ? -- http://www.piclist.com hint: To leave the PICList piclist-unsubscribe-requestspam_OUTmitvma.mit.edu

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@artky1kKILLspamUNINETS.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}>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 hint: To leave the PICList KILLspampiclist-unsubscribe-requestKILLspammitvma.mit.edu