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Networking using laser Answered

Hi, I wanna connect two PCs using laser ,can u suggest me anyting?

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sysadmn

11 years ago

Simple :-)They're commercially available (http://www.totalcommsystems.co.uk/shop/customer/home.php?cat=137), so it's possible. If you're not looking for ultra-high speeds or long distances, it should be pretty simple. At low speeds, you could probably turn off and on the beam rather than modulate it's intensity. That would make the electronics at each end easier. Off the top of my head,
Computer->serial port-->microcontroller-->laser diode/laser pointer--->photodiode-->microcontroller--serial port.

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VIRONsysadmn

Reply 11 years ago

But what if you are looking for really high speeds? :)

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sysadmnVIRON

Reply 11 years ago

You use sharks! Sharks with Friggin' lasers on their heads :-)

38400 baud should be straightforward with RS-232. The commercial stuff goes to 100Mb/s (or even 145 Mb/s if you run ATM ... Does anyone still run ATM?).

This ( http://members.misty.com/don/laserdio.htm#dioclpm ) claims laser pointers can be modulated at hundreds of MHz, and phototransistors (receivers) go to that range. Might be the difficulty is getting data into the microcontroller fast enough.

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sush_dsysadmn

Reply 11 years ago

hello every1 ....& thanks for taking interest & giving valuable suggestions.
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chr

11 years ago

You should check out Ronja (Reasonable Optical Near Joint Access).
They use LEDs and lenses to transmit long distances. Ronja communicates with ethernet cards via the obsolete AUI port.
http://ronja.twibright.com/

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sysadmnchr

Reply 11 years ago

Clever! You could also map the hardware to a serial port and run PPP over the link.

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tomc3uk

11 years ago

Ahhh... EoL. ethernet over laser. Perhaps with a light dependent resistor?