| LCDInfo.com http://forum.lcdinfo.com/ |
|
| 128 x 64 (HD61202) dont understand the voltages, need help http://forum.lcdinfo.com/viewtopic.php?f=6&t=858 |
Page 1 of 1 |
| Author: | Anthrax [ Tue Oct 05, 2004 3:01 ] |
| Post subject: | 128 x 64 (HD61202) dont understand the voltages, need help |
Hey this is my first post, and i'm about to get an LCD i found this one http://www.futurlec.com/LED/LCD128X64.shtml and i dont understand how to power it, do i only use +5volts? or is there some negative voltage that everyone is talking about that i'm missing ? |
|
| Author: | Ecl1PS [ Tue Oct 05, 2004 22:18 ] |
| Post subject: | |
dit you use a corect pinout to your LPT port? like: http://www.fractronics.com/koppling_ks0108.gif I used tis one for the smae controler / screensize. only my screen has EL backlight. and this picture uses a LED. but that should not be a problem. What doe jou see on your screen. things like all random pixels going on and of. or all pixels on. last case: your wirrering is allwrite and the LCD is ready to recive signals from the LPT poort. 1 case ( the random pixels) jour wirering is wrong. I had it a lot but after a lot of trail and error it worked. good luck |
|
| Author: | Henri [ Wed Oct 06, 2004 17:16 ] |
| Post subject: | |
Yes looks like you need a negative voltage to the Vo pin. I think -5v could be close to the correct value. Without further specs you can only try what the correct negative voltage needed is. |
|
| Author: | Anthrax [ Thu Oct 07, 2004 18:14 ] |
| Post subject: | |
alright, so i guess i just have to guess and check ? i'm new to this whole negative voltage thing, will this do ? http://www.aaroncake.net/circuits/vinvertr.htm |
|
| Author: | Henri [ Sat Oct 09, 2004 11:37 ] |
| Post subject: | |
I suppose it would work. Not familiar with that circuit but any circuit that gives the negative voltage should work. I have used the 7660 / 7662 IC's before and the circuit using them is very simple. |
|
| Author: | Anthrax [ Sat Oct 09, 2004 12:54 ] |
| Post subject: | |
Henri wrote: I have used the 7660 / 7662 IC's before and the circuit using them is very simple.
can u give me directions on how to biuld one using this IC ? |
|
| Author: | Henri [ Sat Oct 16, 2004 12:51 ] |
| Post subject: | |
Datasheet can be found from here: http://www.intersil.com/data/fn/fn3072.pdf On page 6 there is a basic circuit in figure 13A. So you need the 7660 IC and two 10uF capacitors, pretty simple. |
|
| Page 1 of 1 | All times are UTC + 2 hours |
| Powered by phpBB® Forum Software © phpBB Group http://www.phpbb.com/ |
|
