ks0108b/ks0107 controller combo - Page 4 - Electronic Circuits Projects Diagrams Free

desaila · 27th April 2008, 07:15 PM

Ah, the lcd i'm using has VEE as the contrast adjustment. Or wait... does it need VO and VEE tied to the same pot to adjust the contrast?

http://www.newhavendisplay.com/pdf/n...az-nsw-bbw.pdf <-- what i'm using.

mister_e · 27th April 2008, 08:18 PM

Refer to the schematic previously suggested.

desaila · 27th April 2008, 09:01 PM

Quote:

Originally Posted by mister_e

Refer to the schematic previously suggested.

I see what's happening, I just don't understand why. Like I understand the connections in the circuit schematic, but I don't understand the reason why it's wired the way it is. I read that thing about the view angle as well, and it only says "do it this way," rather than "this is why it's done this way."

futz · 27th April 2008, 09:25 PM

Quote:

Originally Posted by desaila

I see what's happening, I just don't understand why. Like I understand the connections in the circuit schematic, but I don't understand the reason why it's wired the way it is. I read that thing about the view angle as well, and it only says "do it this way," rather than "this is why it's done this way."

I didn't totally understand why he did that either, so I just copied him.

desaila · 27th April 2008, 09:29 PM

Quote:

Originally Posted by futz

I didn't totally understand why he did that either, so I just copied him.

aha, alright. I have a contact at the company that I've been dealing with on a regular basis, I'll forward him the schematic and ask him what he thinks of it, and if he gives a better answer I'll post it here for the sake of knowledge

blueroomelectronics · 27th April 2008, 10:02 PM

VEE is a negative voltage generator built into some GLCDs.

desaila · 29th April 2008, 08:49 PM

Alright, I have the new lcd all wired up, and it's functioning just fine. To try and verify it was working I tried running the hacked up version of futz's code I had, with the LAT's in place, and other initializations, and I'm still not getting _anything_ to display.

I realized why I fried teh last one, and that is because I was forcing a positive voltage/current into Vee, and since the guy from blue room electronics pointed out that it's a negative voltage generator, I can see this being a problem--or an escape for the special smoke.

Anyway, like I said in a previous post our group has everything else done for this circuit and programmed a simpler lcd in case we can't get this going. Thanks for the help!

desaila · 2nd May 2008, 07:43 PM

Hey, I finally got the LCD working. I worked with Pommie's code because it was displaying something static. I initially had the lcd wired to PORTA, and I think that might have been part of the problem. Furthermore, I copied the PORTD initializing info off the data sheet, inserting assembling to clear PORTD/LATD. So, all the PORTD pins are assigned to the control pins, and the data is tied to PORTB.

Honestly, I'm not sure why it's working now. Part of me thinks that I wasn't initializing PORTA correctly, and that due to the simplicity of PORTD and it's lack of difficult initialization.

Thanks for all the help and holding my hand along the way.

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27th April 2008, 07:15 PM	(permalink)
desaila	Ah, the lcd i'm using has VEE as the contrast adjustment. Or wait... does it need VO and VEE tied to the same pot to adjust the contrast? http://www.newhavendisplay.com/pdf/n...az-nsw-bbw.pdf <-- what i'm using.

27th April 2008, 08:18 PM	(permalink)
mister_e	Refer to the schematic previously suggested. __________________ Steve ______________________ info@mister-e.org www.mister-e.org

27th April 2008, 10:02 PM	(permalink)
blueroomelectronics	VEE is a negative voltage generator built into some GLCDs. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

2nd May 2008, 07:43 PM	(permalink)
desaila	Hey, I finally got the LCD working. I worked with Pommie's code because it was displaying something static. I initially had the lcd wired to PORTA, and I think that might have been part of the problem. Furthermore, I copied the PORTD initializing info off the data sheet, inserting assembling to clear PORTD/LATD. So, all the PORTD pins are assigned to the control pins, and the data is tied to PORTB. Honestly, I'm not sure why it's working now. Part of me thinks that I wasn't initializing PORTA correctly, and that due to the simplicity of PORTD and it's lack of difficult initialization. Thanks for all the help and holding my hand along the way.