Re: Confused LCD screen owner
I happened upon that site a few months ago and realized that the
hardware could be made even easier - you can use the parallel port
itself as the power source.
Also, although it was suggested in a reply, you don't have to set the
contrast to get it to work and be viewable; just tie the contrast pin
(pin 3) to ground.
Here's the pinout I used to test the LCDs I had ordered:
Parallel Port LCD pin (standard layout)
Of course, if you use this you'd have to use the code I wrote, or
write your own. I can email or post the VB code if you want it. It
requires the DLPORTIO dll installed on your machine if you're running
I like my interface better, as it doesn't require you to open up your
PC case for the [potentially dangerous] power supply.
--- In Electronics_101@yahoogroups.com, "Mr. Snuh"
> As an extremely amateur beginner, I attempted to build an LCDdisplay for my
> computer as shown on the websitelooks
> http://www.overclockers.com.au/techstuff/a_diy_lcd/index.shtml, it
> simple enough, but low and behold, I have managed to hit a brickwall. Now
> the website says I need a HD44780 compatible, I figured the DickSmith
> variety (cat. Z 4172) was the next best thing. This LCD has abacklight,
> which is not the problem, the problem is, after soldering, andplugging into
> the computer, the unit gives no signs of life, almost as if itsgetting no
> power. A related question: Molex power connectors in a computerhave 4
> wires, 2 black I think for earth, a yellow and a red. either theyellow is 5
> volts and the red is 12 volts, or vice versa, im not sure which? impretty
> sure the LCD requires 5 volts after looking at the sheet provided.Anyway,
> the question I need answered is, is the Z 4172 (with builtin 'KS0066 LSI
> Controller') the same as a 'HD44780'? or do I have the wrong part
> Thankyou for your patience