[lcdproc] Wiring questions

[Richard Rognlie]

> Hi,
> 
> I am trying to wire my own LCD module (which has a Hitachi HD44780 controller)
> to the parallel port, eventually to drive it with LCDproc. This particular
> LCD module that I have (manufactured by Data Vision, whose mark is on the PCB)
> came with a spec sheet that says the maximum voltage for the backlight (pin 3)
> is 13V, which seems to imply that I should feed it 12V. 

I have the same module.  But mine uses a 5V backlight.  I don't know where
the 12/13V comse from...

> The following is a wiring diagram that I downloaded from the Net:
> 
>   VCC (+5V) O------o-------o--------O Module pin 2
>                    |       | +
>                    /      ---
>                    \      --- 1uF
>                    /       | -
>                    \ <-----o--------O Module pin 3
>                    /
>                    \
>                    |
>   GND       O------o----------------O Module pin 1
> 
> This diagram tells me that I do not need to feed 12V to the module. 

Correct

> My questions are (for those who have a similar LCD module):
> 
> 1. Is the above wiring diagram correct?

Yes

> 2. Do you feed 12V to your module for the backlight?

Nope.  Use the 5V feed

> 3. What is the resistance in the potentiometer?

I used a 10k pot.

visit http://www.gamerz.net/rrognlie/lcdstat/lcdstat4/ for some docs on 
a HD44780 specific system.  I ported that code into lcdproc a while ago, but
I'm not sure if it's in the current baseline yet or not.  If not, 
contact me for the patches.

Richard

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