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Help with an Optrex LCD

T

Tanis143

Gawd
Joined
Aug 18, 2001
Messages
606
Ok, I got an Optrex LCD, and getting ready to wire everything up. I understand the schematics, the one thing Im lost on is which post is the + and - for the lcd backlight. Here is what it looks like:

optrex.jpg


The connections for the led backlight are on the side and labled "A" and "K". What I think is correct is the "A" is the anode and "K" is the cathode. Is this correct? THat would make "K" the negitive and "A" the positive right?
 
that is an el backlight correct? if so then you will need a el converter. If it is just leds then just test it, take the wires and touch the connectors one way then the other. when the led turns on it, thats the right way. you will not blow out the leds, i have done this several thousand times with random leds. If it is an el backlight you can test it the same way, but you will have to use an el converter. I hope this helps

JEEVES

edit* i just reread your post and saw that it said led :rolleyes:
 
Nah, not an EL backlight, I had the option to get a 4x40 with EL backlight for the same price but did not want to deal with an EL invertor.
 
+ -> A (anode)
- -> K (cathode)
Make sure to check if you need to put a current limiting resitor in series with the power. Otherwise you will likely fry the backlight.

-special [k]
 
Originally posted by specialk
+ -> A (anode)
- -> K (cathode)
Make sure to check if you need to put a current limiting resitor in series with the power. Otherwise you will likely fry the backlight.

-special [k]
Click to expand...

youd think there was one built into the board, but yeah I would check too.

JEEVES
 
Originally posted by JEEVES/whohasmyname?
youd think there was one built into the board, but yeah I would check too.
Click to expand...
I would HOPE there was one built into the board; however, I have worked with too many character LCDs to say that it would have one. Almost every bare-bones HD44780 backlit LCD has either an EL backlight (like you mentioned) or LEDs (either in an array or side-lighting the display). I would suggest hooking up a 200-500 ohm potentiometer between the anode and +5V and try to find a brightness that you are comfortable with (I personally don't like very bright displays sometimes). Good luck!

-special [k]
 
Well, based on others I've seen wire up LCD's that are very much like this one, I have inline with the +5v powerline a 10 OHM resistor. Unfortunately the spec sheet from Optrex does not give the limits of the LED backlight. Should I hook up a pot with as high as OHM rating as specialK said or should 10 OHM's be enough? Here is a copy of the spec sheet, maybe I missed something.

DMC16230NY-LY-B

btw I thank you all for the help. Im no EE, though I do have some skills with a soldering iron and can read basic schematics.
 
how do you like the lcd i am thinking on getting one
 
I'll let you know once I complete it :D

If it works, I'll love it. If it doesnt work, I'll curse the thing :)
 
Woot Woot! With the exception of LCD Center not wanting to display my temps from MBM, it works perfectly :D The color with a 10ohm resistor is perfect. Not too bright, but not dim. The LCD I got is awesome, nice big characters. I can read the thing from across the room! Anyway, anyone know how to get LCD center to display the temps correctly, or another program that works better? Thanks.
 
:2nd edit:

I would like to again thanks all for your help. Here are the fruits of my labors. This is without the LCD mounted yet.

lcd01.jpg

lcd02.jpg

lcd03.jpg

lcd04.jpg
 
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