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|   November 15, 2006 at 3:48 PM

The current version of this graphic display (GDM12864H) has a unique feature that I have not seen in any other 128x64 graphic LCD. Its pixels (and pitch) are square (0.39x0.39mm) so your circles appear as circles -- no more ellipses!!!

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|   November 10, 2008 at 11:36 AM

How bright is this LCD? Can it be used outside?

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|   December 14, 2008 at 11:08 AM

I intended to drive this LCD with an ATmega168, which now appears to be an astonishingly bad idea if the uC has only 1K RAM and you need that to drive the LCD. True? Or am I missing something completely obvious to the non-novice? It looks like I need a separate uC (like the DiosPro) to drive the LCD, with the 168 uC controlling the DiosPro via the UART? Happy to take advice....

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|   December 14, 2008 at 6:39 PM

You don't have to devote any ATmega168 RAM to the LCD. This component has its own video RAM, one bit per pixel, 512 bytes total. I think you have to write whole bytes at a time (8 pixels), and it doesn't know how to draw a letter "A" by itself, but the App Note from Kronos Robotics says they have a higher-level Dios library to deal with such operations.

I have a tiny oscilloscope I bought from another vendor, it looks like this part is identical to the screen they use.

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|   February 16, 2009 at 7:18 PM

Since there doesn't seem to be any AVR code for this linked, here are my notes and code for using this module:

http://jormungand.net/dev/avrlcd/

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|   November  4, 2009 at 7:32 PM

In order for this code to work right, you need to fix the command that turns the LCD on. In lcd.c, on line 35, "0xE3" should be "0x3E".

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|   March  3, 2009 at 6:39 PM

does anyone have the code for this to use with arduino???????

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|   March 24, 2009 at 10:14 PM

for those interested, there is a link in the Arduino playground for controlling KS0108 graphic displays!

http://www.arduino.cc/playground/Code/GLCDks0108

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|   March 24, 2009 at 8:45 AM

Does anyone have any code/examples on how to make this work with a msp430??

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|   March 28, 2009 at 6:47 PM

I would also like to see some!

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|   April  7, 2009 at 11:27 AM

I haven't found anything for the msp430 yet... a simple example of how to put a mere pixel on a specific point in the screen would be awesome!!

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|   May 24, 2009 at 0:01 AM

Additionally, a tremendous amount of useful information pertaining to that library can be found in the Arduino forum discussion:
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1210427907

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|   May 30, 2009 at 1:37 PM

Any idea when this will not be on backorder?

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|   June 13, 2009 at 7:36 AM

I purchased one of these and hooked it up to my Arduino Mega according to this page:
http://www.arduino.cc/playground/Code/GLCDks0108
I grabbed the software and loaded it. The backlight works and at first I saw a few lines on the display itself (these faded). When I ran the software from that web page, nothing came out on the display. I played with the contrast potentiometer a little, but I still see nothing. The program is running (I added some Serial output for debugging).

Is it possible that I burned out the controller? Or... is it possible I just got a bad one? Does anyone have experience with these that might be helpful?

Thanks!

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|   June 16, 2009 at 4:54 PM

There is a very good chance you just haven't done something right. I had some trouble getting it to work as well, but it was because the code wasn't doing the right thing. I design and develop my own boards so I have no experience with the Arduino, but if you have a more specific question I can attempt to help you.

Vo can be connected anywhere from -5V to +5V. As long as you didn't connect it to a voltage outside of that range, it should still work.

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|   June 16, 2009 at 4:58 PM

I forgot to mention that the LCD voltage, in my experience, should be around -4V for the display to be readable. Close to -5V will turn all of the pixels fully on and above -3V they will be totally transparent. Other units may behave differently but this is how mine works.

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|   June 18, 2009 at 5:31 AM

Thanks for the info. I was quite careful about the voltages being supplied to the LCD, but I'll check again (and verify the contrast voltage).

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|   July  8, 2009 at 7:40 PM

I have tried Csloser's AVR code, but all I get is one horizontal line, the top most specifically to write. I have hooked the output of my DB0 - DB7 to an oscilloscope to confirm I am writing. I have also confirmed this corresponds to my CS1/CS2 signal. has anyone else had this issue?

On the page Csloser links to, he recommends a pull down resistor. Could anyone comment on the importance of this? Could this be the cause of my one line LCD?

Thanks in advance for ANY help.

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|   August 28, 2009 at 0:36 AM

I'm going to have to throw my hat into this with GeodeLX and InkAnkUnk. I can't get so much as a pixel out of this thing, using Csloser's AVR code and having checked and rechecked wiring N times. Writing my own library from scratch from the datasheet also results in absolutely nothing. At least the backlight and contrast adjustment via pot works.

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|   August 28, 2009 at 9:14 AM

I've done exactly as csloser did in his tutorial, but i am also having difficulties getting it to work properly. I'm running it on a ATmega168.

While the microcontroller was running, i had to take the display off my test board, because (stupid as i was) i mounted the V0 pot-meter under it. When i connected it back it was working!
So now i can get it to work, but only if i pick it out and put it back in a couple of times, or cycle the power... I have no clue why it is like this, but maybe you other guys can do the same, and see if it helps.

PS: If i press the reset button which i have connected to the LCD while it's working, it stops working again, and i have to cycle the power... :(

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|   August 29, 2009 at 6:00 PM

I tried this method, without success. Obvious resets and power cycles do nothing, as well.

I just ordered the damn usb logic analyzer from SFE, so I should be able to debug what the hell is going on. I will post back here if I come up with anything. Hopefully we are all having the same problem. :)

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|   September  2, 2009 at 5:02 PM

Ok, so I've had my analyzer for a day now, and it helped me figure out that PORTA on my MCU is a pile of crap. The LCD seems fine after all.

I can't recommend this analyzer highly enough, after this experience:

http://www.sparkfun.com/commerce/product_info.php?products_id=8938

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|   December 18, 2009 at 12:24 AM

This product has very good app note thanks Sparkfun

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|   December 31, 2009 at 7:43 PM

So, stupid question, the LCD screen says it needs 9V to work. Is that supplied by the circuits on the board, or do you need to create a step-up dc converter to change 5V into 9V?