Can this be done without a 100 resistors?
Imagine 100 phototransistors all lined up side by side forming a line, and let's say #73 is hit by laser beam, phototransistor allows current thru, and a microprocessor know's which one was turned on.
Is there a trick to multiplexing this stuff so a 16f877 can do this without 100 resistors???
Ok I guess judging by the response time, that no one is there, or they don't know.
I figured it out myself, 32 x 32 = 1024. I can multiplex 1024 photo diodes together and get 1024 resolution. 32 rows 32 columns. 32 I/O pins on 16f877.
Yes totally possible.