hi all ive been having trouble with my LCD screen ive been trying to make... i used this guide to wire it up the way they did it... i brought a LCD module from maplins u can find the list here and its code is N27AZ ive checked the layout of the pin assignment on the relevant pdf file they have there for it... and it still dont work... it gets power but thats it... i tried using LCD smartie to "control" it but no text was being shown.. i have opened my parallel port as it was closed b4 i started and port 378 was opened in the bios settings... are there any other things i can try? coult i try another LCD program and if so what..
Well you messed up when you bought that display as if i'm correct than that has a not hd44780 compatible controller therefore even tho the pinouts are the same it won't work because of the differences in the instructions needed to run the controller. you need to find a prog that can handle that controller or you need to make one with the instructions located on the datasheet of the controller... if i'm deducting right from the forum threads i found on this topic (from other forums) it is sed 1520 compatible so you may try lcdproc to control it but i'm not sure... anyway check out the datasheet of the module and make double sure that eveything is connected properly before you try it again...
thats just a bummber.... when looking on the website i couldnt find anything to tell which controller it had... and when i was in the shop they had no idea what i was talking about anyways...
ill post some pics of it later.... camera needs to recharge for a bit... but can any 1 reccomend another LCD program? ill give them a try and see if they work... the website says its either 1 of the controllers...
Indeed it does: Where did you get your information from EdHunTer saying it was not compatable? Ensure you have installed DLPortIO on your computer: http://www.driverlinx.com/DownLoad/DlPortIO.htm
ks0070b that's what the pdf says for controller and as i looked it up on google i found that it isn't compatible at least most sites stated that http://www.maplin.co.uk/Media/PDFs/N27AZ.pdf if i' wrong than sorry my mistake
then my bad sorry anyway then i can get lcds like that even cheaper (that's 8 eur/piece and even less if i buy more of 'em)
well how far are u getting, with the power on, but not plugged into the computer, can u tweak the contrast pot, until it has all black rectangles?
You see this is the problem with the internet you shouldn't belive everything you read. No i guess you don't "need" one, but its helpful as it allows you to tweak the viewing angle. Get a 10k pot, put one leg of the resistor to gnd, the other to 5v, and the sweeper to Vo (operating voltage, the contrast pin).
when you power up the display does it show any pattern? (if i remember ok that guide says to ground the contrast wire therefore making it constantly on max) if nothing shows up at all check the power connections since you should see a test pattern.
Errr no. You don't nescicerrally get a test pattern, and surely if u take contrast to max, all pixels would be solid.
Well as far as i know almost all LCDs give a test signal anyway even if all blocks are solid you should be able to see if the panel works or not since the blocks will change place when changing what is displayed
somes small trimmer pot should be enough 10kohms as it has been said before. A small trimmer has the advantage that you can solder it directly onto the pcb and making it almost invisible (i suppose once set you won't want to adjust the contrast daily but you place it where you want to)
