I've did it at 15m with blue plastic lenses, 930nm LED and any
standardised 36-38KHz receiver.
Looks much more than 24 x 2.54cm = 60cm

greetings,
Vasile



On 10/5/06, alan smith <micro_eng2@yahoo.com> wrote:
> Long range....well....in the world of micro electronics, 24" is a long distance.  So looking for a IR emitter/dectector pair that can work at those distances. Basically its a beam detect type thing....to detect when the beam is broken or disturbed.
>
>  Anyone have a favorite device?
>
>
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