Notice. New forum software under development. It's going to miss a few functions and look a bit ugly for a while, but I'm working on it full time now as the old forum was too unstable. Couple days, all good. If you notice any issues, please contact me.
mariae71 Regular Member Joined: 22/08/2012 Location: SwedenPosts: 43
Posted: 06:44am 14 Sep 2012
Copy link to clipboard
Print this post
I euthanized a misperforming printer/scanner at my work in search of useful parts, and one of the things I found was a LCD-screen, possibly 16x2 chars, with 10 pins. Problem is, that I never thought about checking how many chars it displayed or even the brand of the printer (might be Lexmark or Epson, it was very cheaply made anyway). So I'll now try to see if anyone here can guess the pins or even recognise the LCD...
I desoldered the screen from a board that only had some resistors and momentary buttons, there was no driver chip on the board so my guess is that it's integrated under the screen.
Would be cool to be able to use that screen for text output.2 x DuinoMite Mega
1 x DuinoMite eMega
Frank N. Furter Guru Joined: 28/05/2012 Location: GermanyPosts: 828
Posted: 05:23am 17 Sep 2012
Copy link to clipboard
Print this post
Hello Maria,
your LCD looks very similar to a ROHM RCD2090
( Take a look at: http://www.mikrocontroller.net/topic/252260 )
Your LCD has maybe the same connection?
Frank
mariae71 Regular Member Joined: 22/08/2012 Location: SwedenPosts: 43
Posted: 09:10pm 17 Sep 2012
Copy link to clipboard
Print this post
Thank you Frank,
that looks very similar, yes... I will try it when I come home from work.
2 x DuinoMite Mega
1 x DuinoMite eMega
mariae71 Regular Member Joined: 22/08/2012 Location: SwedenPosts: 43
Posted: 01:26am 21 Sep 2012
Copy link to clipboard
Print this post
Well, it does not work, think I might have damaged the screen somehow, but found another screen in a dead low cost Canon Pixma MP220, the screen is 16x1, but it actually behaves like a 8x2 screen, but that does not matter. 2 x DuinoMite Mega
1 x DuinoMite eMega
djuqa Guru Joined: 23/11/2011 Location: AustraliaPosts: 447
Posted: 01:28am 21 Sep 2012
Copy link to clipboard
Print this post
PM me a mailing address and I will send you a New 16x2 Module for free if you want one.
Edited by djuqa 2012-09-22VK4MU MicroController Units
mariae71 Regular Member Joined: 22/08/2012 Location: SwedenPosts: 43
Posted: 04:33am 21 Sep 2012
Copy link to clipboard
Print this post
Oh! That's very generous of you. :)2 x DuinoMite Mega
1 x DuinoMite eMega
Bryan1 Guru Joined: 22/02/2006 Location: AustraliaPosts: 1344
Posted: 10:57am 21 Sep 2012
Copy link to clipboard
Print this post
Hi Mariae,
After reading this thread I remembered I had a 10 pin 1 line lcd up in my shed so I went up and had a play with it. I set my psu to 5 volts and pin 1 went to ground, pin 2 to 5 volts next thing the backlight came on. Now looking at the traces the backlight is hard wired to the supply so it is on all the time. With pin 3 I turned the voltage down to 2 volts and the display dimmed.
So try that out on yours and hopefully it may still prove good.
Give it a go and you may find it is correct but eh it is worth a shot.
Regards Bryan
mariae71 Regular Member Joined: 22/08/2012 Location: SwedenPosts: 43
Posted: 08:56pm 21 Sep 2012
Copy link to clipboard
Print this post
Hi Bryan, and thanks! :)
I have tried that combination before, but I desoldered all the wires from the pins and mounted it to a prototype board now with your pinout, still no luck... Then i thought that i had nothing to lose so I disconnected it from the DuinoMite took a 4.5V battery pack and placed the negative lead on the first pin and the positive lead on random pins, then on pin 3 the screen came to life, displaying random garbage chars.
Turns out that the only problem was that 3.3V was not enough for the contrast pin, so with a 10K pot on pin 3 that goes to ground and to +5V everything no works. :)
This screen is even more odd than the other one, it's a 1x16 screen that behaves like a two line screen also, but to get a full 16 char line printed out one has to print first 8 chars on line one, and the following 8 chars on line 3. 2 x DuinoMite Mega
1 x DuinoMite eMega
Notice. New forum software under development. It's going to miss a few functions and look a bit ugly for a while, but I'm working on it full time now as the old forum was too unstable. Couple days, all good. If you notice any issues, please contact me.
Print this post
