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Discussion about LCD's and other related hardware

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davian
Posts: 2
Joined: May 16th, 2007, 9:30 pm

Getting started

Post by davian »

Hello!

I just bought a new 2x20 LCD it's a GDM2002D ver2.1 Xiamen display.
Image
I have the data-sheet here http://bsdguru.net/lcd/GDM2002D.pdf

I wired it up accordingly to Image. Replacing the pins to match my specific display.

I installed DLPortIO. It fires up ok, and displays the 'start screen'. Then nothing happens :/. ImageImage.

I've tried all kinds of addresses/options, but nothing happens. The 'start screen' is all I get.

The display is connected to my LPT1 port and takes the current from a USB connector.

This is what my LPT1 port says: Image.

I've triple checked the wiring with my multimeter and it all checks out.

Could it be that LCD Smartie doesn?t support this KS0066U chipset display? Any tips on how to get it working or debug is very appreciated. Maybe it has something to do with the variable 4 or 8-bit datamode?
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ujjvalshah
Posts: 6
Joined: May 15th, 2007, 5:05 am

Post by ujjvalshah »

i had used an lcd(16x2) in some other project and i had the same problem.. i mean i was getting the same kind of display....

try connecting the R/W pin to the ground.. this had solved my problem .. i hope it solves yurs too...
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davian
Posts: 2
Joined: May 16th, 2007, 9:30 pm

tried

Post by davian »

Thank you, for the tip. I've tried connecting the R/W pin 5 on the display to ground. But it's still the same. I then tried connecting it to Vdd (+5V). But there where no diffrence. :(
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ujjvalshah
Posts: 6
Joined: May 15th, 2007, 5:05 am

try this

Post by ujjvalshah »

hi there once again.....

try the connections given here....

http://electrosofts.com/parallel/lcd.html

it should work most probably
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caesar
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Posts: 734
Joined: October 15th, 2005, 10:39 am
Location: Romania
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Post by caesar »

A question first:

Are you using this display on a laptop?

If your answer is positive, you should know that there are laptops that don't really stick to parallel specs and have lower voltages on data lines and it can't drive your display.
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ujjvalshah
Posts: 6
Joined: May 15th, 2007, 5:05 am

Post by ujjvalshah »

caesar wrote:A question first:

Are you using this display on a laptop?

If your answer is positive, you should know that there are laptops that don't really stick to parallel specs and have lower voltages on data lines and it can't drive your display.






ya.. this might be true.. coz even my parallel port programmer for avr did not work with the laptops but worked [erfectly with te comps
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