So I cant get my simple LCD to work... :(

**sirhotalot** · 08-15-2002, 10:31 AM

Yes this has been asked before, I just couldnt find a suitable responce that fit my condition. I have a 24x2 lcd that I cant get to print. It is hooked up to my pararlel port using the pop. pinout diagram. This should be correctly references as I double checked it to my port pinout that came with the display. Anyway when I power it up I get the standard go signal, black boxes accross the top- but I cant get my computer to do anything on it. Not even produce garbage. Ive been trying to use lcdprint. I boot to 98 type command: lcdprint 378 it then says that my port is there. THen I type lcdprint 378 24 2 mytext.txt (i mae a textfile and placed it in my home directory, it just returns me to the dos prompt with no responce from the screen, am I missing something here? the other person who got this display (http://www.allelectronics.com/cgi-bi...-74&type=store) seemed to be doing the same thing I am and got it working! So am I missing anything? Is this a software problem or should I try and rewire? Thanks for helping me out,
Eben

**bombboyer** · 08-15-2002, 02:03 PM

I'm having the same EXACT problem, but mines 40x4. Heres a bump for ya.

**mikeinsanmarcos** · 08-15-2002, 02:41 PM

most common problem is wiring mistakes! Double check with continuity checker...

**sirhotalot** · 08-15-2002, 05:43 PM

Still no luck... I checke dall the connections, three times over at three different sititngs (just in case of brain fog) I cant find any soulution! The only thing I dont have insatlled are the two resistors (ones a variable 10k and the other is a fixed 100k but its for pin 16 that i don thave anyways so I dont know on that one. ) So am I stuck? Where else should I look? I know someone from that website apparently got this up and runnignwithno trouble.

Ive got all night so im up for any suggestions (no matter how timely)
Thanks!!
E

**mikeinsanmarcos** · 08-15-2002, 05:45 PM

do you have a link to the wiring diagram you are using?

**sirhotalot** · 08-15-2002, 06:05 PM

I first tried this one : http://lorty.mp3car.com/lcdcorrect_eio.jpg but that didnt seem to work since my display has fewer connectors so I switched to a similier one that wires port 1 to port 6(e) and the other sequentially from that. Reflecting on that it doesnt really mkae sence since theseprogarms must be based on the same general wireing- im going to go and try to wire it up using the one i just posted!Thanks ill be back ina sec!
E

**sirhotalot** · 08-15-2002, 06:11 PM

well it turns out they hook up the same. Pin 1 for me is just Vss. and my data channel starts at pin 6 (e) so it lines up straight accross....and yet my display will not respond. Sigh. Any other thoughts?

**Raas** · 08-16-2002, 04:22 AM

Hi,

i once was having these probs on my 4x40 too.
Seems you have to turn the contrast all the way up in order to see anything on the display..
I had the same symptoms.. triple checked everthing, and again and again, but everything seemed right.. untill I started to play with the resistor for the contrast.
suddenly, the characters became visible on the lcd.. and is working great since then.

hope this helps you out.

Greetz,

Raas