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Parallax Serial LCD controller question — Parallax Forums

Parallax Serial LCD controller question

bunnibunni Posts: 38
edited 2007-11-19 18:32 in General Discussion
Hello,

I have a 2x20 LCD display from parallax, it has a Rev. E board on the back. My question is, is the software on the serial controller good enough to drive a 4x20 screen that I have laying around, I checked and it is the same pinout, I just don't know if it would work if I just put it on my 4x20. Thanks for the information.

-Kris

Comments

  • FranklinFranklin Posts: 4,747
    edited 2007-11-18 23:58
    You could always try.

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    - Stephen
  • bunnibunni Posts: 38
    edited 2007-11-19 09:35
    Of course I could, but that means de-soldering the controller, my current LCD screen, and then re-soldering everything back. Not to mention the pads on my 4x20 are shaky and probably couldn't take anymore soldering since its pretty old and was abused when I got it.

    -Kris
  • Mike GreenMike Green Posts: 23,101
    edited 2007-11-19 14:56
    Why ask if you're unwilling or unable to try it? You're asking about a non-standard use of part of a device with something else without your having even a part number or datasheet for that and you want a guarantee? You'll find suggestions here and opinions ... plenty of those. Parallax has the guarantees ... they're pretty good, but they're for the use of the product as intended ... not for pieces of it. Sorry.
  • bunnibunni Posts: 38
    edited 2007-11-19 17:48
    I ask because I want to know if anyone else has done this, or can say "yes the Rev E board can be directly plugged on to a 4x20 from the 2x20 LCD screen" Parallax even sells a 4x20 LCD screen, this is why I ask, if it is the same controller board. I would try it, but I doubt the board I want to put it on would survive more than one more soldering/de-soldering cycle because it is in suck bad shape, which is a waste of a $20 LCD screen. I do not want a guarantee, just that the controller board with its current software could handle 4x20 lines. And as I said, the pinout of my 4x20 and the 2x20 that the controller board is currently on from parallax has the same pinout, I am asking about software.

    -Kris
  • RDL2004RDL2004 Posts: 2,554
    edited 2007-11-19 18:04
    Are you sure you have a 2x20? The Parallax 2 line serial LCD is 2x16. It might work but the built in word wrapping may cause headaches going from 16 to 20 characters per line.

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    - Rick
  • bunnibunni Posts: 38
    edited 2007-11-19 18:32
    I think you got me on that one, I just looked at my numbers wrong. However, it might not be the software on the controller board, if I recall correctly the HD44780 LCD screens would handle word wrapping in that respect. Going from line 1, col 16 to line 2, col 1 on a 2x16 is the same as going from line 1, col 16 to line 1, col 17 on a 2x20 or 4x20. All your doing is incrementing the address by 1, it just so happens the next address falls on a different line, however I could be wrong, which is why I am asking.

    -Kris
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