What exactly you want to do with this,...
Optical pulse generator (optical potentiometer) generates pulses on two pins (A,B) when it is turned; CW pulse on pin A are precedes pulse on B pin and vice versa for CCW. By detecting both pulses we can determine in which direction pot is turning.
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If I understood your problem properly, I think this should solve it.
After giving it some thought I concluded that this can not be done without the use of interrupts, which my previous design lacked. So by using two interrupts I can easily detect pulse on one pin and then check the other to see which direction pot is turning...
I guess I'll for something similar you suggested, but it is not doable with parallel port, but that no problem since my final design is for embedded target with plenty of irq capable GPIOs. I used parallel port was as intermediate step for testing.
Thanx, h
-- hinko <dot> kocevar <at> iskramedical <dot> si Hinko Kocevar, developer Iskra Medical d.o.o., Stegne 23, 1k LJ, SLO-EU
"Aì rén" | [Analects XII:22]
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