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Where does the ground go ?
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Author:  xenophon [ Sun Sep 17, 2006 23:24 ]
Post subject:  Where does the ground go ?
Hi all,

I'm going to wire a lcd with a KS0108 controller using the diagram from this site. Here it is:

Image

But I have questions about the power supply.

1) Why dont we use the power from the parallel port ?
2) Why are pin 18 to 25 from the parallel port connected to the ground ?
3) Are pin 18 to 25 connected to the ground of the parallel port or to the ground of the power supply ? Or does it not mather ?

Thanks for answering my questions.
Author:  coorz [ Mon Sep 18, 2006 22:25 ]
Post subject: 
1) LPT probably doesn't supply enough power (current) to drive an LCD
2) Uhm because they are GROUND pins :D
3) connect them to the same GROUND of the powersupply that powers your LCD.
Please make sure of wiring the GROUNDS properly, KS0108 is very picky...
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