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Salvage the light barriers of an old mouse to use it as a lightbarrier eg on the left mousebutton ?

Is it possible to salvage the light barriers of an old mouse to use it as a lightbarrier eg on the left mousebutton ? It would be interesting for counting small insects! ANTS! In old ball-driven mouses there are two small "light barriers". They are interrupted by punched discs. Is it possible th wire the receiver of the barrier to substitute a regular mouse button? It would be wonderful having two lightbarriers on one USB/PS2 port! Thank you! PeerTeer teerpeer@web.de

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