Leo Howell (Sun, Apr 29, 2001 at 09:17:38AM +0100):
> On Sat, Apr 28, 2001 at 08:22:04PM -0400, Travis Bemann wrote:
> > It would not be very hard to rig laser communications. Just have a
> > laser and hook it up to a computer which turns it on an off very
> > rapidly according to the data that is being sent, and have a
> > photosensor sensitive to the particular frequency that the laser is
> > using, which sends the data it gets to an A/D converter, which in turn
> > sends it to another computer. The computer then interprets anything
> > in a particular minute unit of time over a particular threshold as
> > being a 1 and everything else is a 0. Mirrors are used to direct the
> > laser beam, in case there is no direct line of sight between the laser
> > and the photosensor.
>
> Unfortunately it's not quite that easy (please correct me if I'm
> wrong). Unless you're prepared to spend a lot of money ($100s)
> on a laser you can digitally modulate you have to find some
> other method of switching the light - I recently tried PWM at 11 kHz on a
> laser diode from a pointer (for transmitting speech but same idea) and
> I totally destroyed it. The best solution for lasers IIRC is some
> type of light switch that works a bit like an LCD (I gave up and
> used an LED for my project :)
placeing a mirror on a speaker would work, too. well, the transmission-speed
woudn't be that high, then....
hmmm, LCDs would be best solution, probably...
how do you carry a sync-signal??? other frequency???
hell, that'd be nice for citys.... 10 reciever/sender pairs establishing connections
to your neghbours, and you have (almost) free high-speed internet...
so, i'll search a laser diode and a photosensor and a speaker and try to transmit
music, now...
damn... i can't find anything :(
--
moritz
PS: whadabout a freenet-weird-links mailinglist
kernel panic: hands went berserk and are typeing a lot of useless stuff.
it's recommendet to send the system to few hours of sleep.
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