I wanna connect two PCs using laser ,can u suggest me anyting?
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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But what if you are looking for really high speeds? :)
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.
hello every1 ....& thanks for taking interest & giving valuable suggestions.
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/
You could also map the hardware to a serial port and run PPP over the link.
Ahhh... EoL. ethernet over laser. Perhaps with a light dependent resistor?