[sdiy] super-nice LED interface ..

[Jay Vaughan]

>The array has alternating emitters and detectors, both make from
>LEDs.  The finger causes light from the emitters to hit the
>detectors.

but .. all LED's are on in that demo, so does this mean that the 
array has LED's that are 'off', but still being used as a detector, 
or does it mean that LED's can be used as detectors even when lit?

i'm really curious about the feasibility of this design, however it 
works, for a properly working interface .. so if anyone gets it in 
their head to get working on such a thing, count me in as a software 
hacker/user who would like to take things past the 'last mile' in 
software, should that be needed ..

-- 

;

Jay Vaughan