The 10K pot for the contrast? Yes that's enough. The 100ohm pot on pin 19+20 control the brightness settings. It is NOT necessary BUT the 22ohm resistor MUST be there otherwise you'll destroy your backlight. Another tip: if the back of your display, the 3 plastic drops, get REAL hot, STOP using it immediately, and recheck and check and check your wiring. Same applies if the display area and the metal frame get too hot to touch.
It means connect all of those pins (pins 18-24) from the parallel port to all the ground points on the schematic.
R3 is the contrast POT right, So what is R7 for?? I've only got one POT. Looks like going to mappers to get a 100ohm one. I think we might get there in the end...
That scheme from SteveyG should be OK. Basically same as the one i used. On the printer-connector side: just solder-short pin 18 to 25 and run one cable from it to ground.
Coorz...So whats R7 for? So what drivers do i need for this to run in XP?? **EDIT** if you look at the two drawings pins 19 and 20 are different from one to the other. One uses POT R7 and one don't. so what do we use????
R7 is a POT, it controls the brightness. NOT necessary to have it, but that 22ohm resistor is required. Various LCD apps can be used with this LCD. They have been mentioned before earlier in this thread. (i have to support LCDinfo, howdy Henri!)
Thanks Coorz i think that has answered all my questions....Until i wire the thing up... Well fingers crossed...
From what I can work out, there's no real way you can damage these LCD's unless you reverse the supply rails or short the negative voltage output. Any of the inputs can accept logic 0 or logic 1, so unless the inputs are left floating there doesn't seem to be any reason for anything to get hot. May be worth testing the voltage output of your parallel port to make sure the outputs aren't any higher than 5V Don't use anything lower than a 1k pot for the contrast, as the negative voltage regulator may not be able to supply sufficient current - (e.g. 100 ohm pot = 0.1A = hot chips)
can you guys just confirm thi.s The people who havent received a screen yet that should have post your name and how many screens you ordered. Plus the payment method. I kinda lost track of things.
in reference to my earlier post, i award myself the princely sum of 1 virtual cookie::: thanks visualaid even tho one of my screens blew up i still have you to thank and tbh it does look its really sharp!!!
by the way, you should use LCDstudio to power it,, that is what i am using ATM with my WORKING lcd i will post more pics later including the custom stats winamp etc screens i designed
This has me beat I cant get any programs to work, the test program from the lcdinfo page just says "can't open the driverLINX driver" when I click on start driver, LCD studiostudio just locks up if I try to add the crystalfontz display Any ideas
Malcs, what wiring diagram did you use ?? This may help the rest of us immensely. Darkside. /Looks really smart, can't wait to get mine going when I have the time to solder it.
