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Topic: [solved] Salvaged LCD (Read 1 time) previous topic - next topic

Aqlor

Feb 07, 2011, 11:34 pm Last Edit: Feb 08, 2011, 03:20 pm by Aqlor Reason: 1
Hello,

I've never used an LCD before, however I found one today on a pile of electronics I was cleaning up.

It's a 14 pin LCD with no markings so I can't find much help online...

Is there anyway you know of testing this?

Thanks

floresta

How about a photograph of the back?

Don

Aqlor

There you have it



I didn't thought it would be helpful though

bill2009

#3
Feb 08, 2011, 02:47 am Last Edit: Feb 08, 2011, 02:49 am by bill2009 Reason: 1
Raw LCDs are tricky to drive.  Have a look at this http://arduino.cc/forum/index.php/topic,51464.0.html

as a quick experiment try running a 50hz square wave at 3v across the two end pins and see what you get.

floresta

#4
Feb 08, 2011, 03:11 am Last Edit: Feb 08, 2011, 03:16 am by floresta Reason: 1
Quote
I didn't thought it would be helpful though

At first I thought you were correct, but in that view it looks like the four pins on the right could go to a controller, and the next four may not be connected to anything.  This is consistent with the data pin connections using a 4-bit data interface to an HD44780 controller.  Try following the left pin and see if it goes to ground and see if the third pin from the left goes to the potentiometer.

Don

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