"Peter L. Peres" wrote:
>
> > going 200ft
>
> You can go 300+ft with a modulated IR beam and some optics. The mirror
> from a large pocket torch (flashlight or whatever you call it) is required
> on the Tx side and simple telescope optics on the receiver (one lens is
> enough). There is a website with a collection of electro-optical circuits
> that you may want to see. Use Google.

I think i found it here:

<http://www.cix.co.uk/~lasertag/lasertag.htm>



>
> There are pre-made modules but good results can be obtained using IR
> modules for remote control use. These can be made to pass RS232 with a
> simple (even 555) modulator on the Tx side. Jan Axelsson wrote some
> articles on this I think (www.lvr.com)
>
> FYI by simply replacing the LED in a remote control with a laser diode
> from a defunct CD player head (but make sure the laser still works - NOT
> by looking into it - use a video camera or CCTV camera, or digital camera)
> ranges of 40 feet can be attained. Aiming becomes a problem but 40-50 feet
> ? ;-)
>
> hope this helps,
>
> Peter
>
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