advice needed on variable resistors for LCD
With that diagram everyone has for coupling LCD screens to printer ports;
I notice there are two variable resistors needed for the brightness and contrast of the screen.
1/ I dont know too much about electronics but I've built by own cables before, could anyone tell me what exact parts I need, ie: any particular wattage or type these variable resistors need to be. So I dont feel stoopid walking into Maplins explaining what I need for my project.
I am going to order some $15 non backlit 4x40s from EIO
John H
http://mp3appliance.ohgo.com
Use POT ... and connect it to pin 1, 2, 3. in between cable and 4x40 LCD..
then you can adjust Resistor value using Pot.
I used 100k (104, I think) and works fine..
but not that broad range.. I had this so I just used for change brightness...
You might try less pot resistor..
[ 10-04-2001: Message edited by: helloman ]
Started
<A HREF="http://www.mp3car.com/usersites/zp3/" TARGET=_blank>
http://www.mp3car.com/usersites/zp3/</A>
I wondered this myself at one time. I have Timeline's 40x4 Densitron backlit LCD display, and I found on the Densitron website that they recommend a 2.3 ohm resistor for the backlight. So, instead of trying to find a 100 ohm potentiometer, I simply wired 2 1-ohm resistors in series and as far as the contrast potentiometer, well, I find there is no need for it, as full contrast is the best for my particular display. So I have that connected directly to ground. LCD is beautiful and the brightness is as bright as it could possibly be without getting hot.
Posting Permissions
LinkBack URL
About LinkBacks
Reply With Quote
Bookmarks