Hello all, I have been working with an interfacing project lately and I think I have "screwed up" my parallel port. When trying to read data from the data register (set from an A/D converter) I wasn't getting correct results. After some "experimenting" I realized one of the pins isn't going "high" when being supplied voltage. Anyway, it seems if I connect this pin directly to the +5 from the 7805 regulator it goes high, but the A/D converter IC doesn't seem to se the pin high. I use a multimeter and figured that this pin needs at leats 18mA to go high while all the others need about 2 (maybe less). SO, my question is, is this normal? Do specific pins on a parallel port act that differently from eachother or have I fried something inside my laptop? Nonetheless, my port still works, I just altered its functionality. So how could I use my A/D converter to throw this malfunctioning parallel port pin high? Could I use a transistor (2N3904?!?) somehow? Any help would be excellent. THanks, Lucas.
- posted
17 years ago