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Looking for a fairly large LCD display. — Parallax Forums

Looking for a fairly large LCD display.

Mike B.Mike B. Posts: 31
edited 2010-07-22 06:16 in Propeller 1
I am looking for a display to use with my submarine project.· I have a Scott Edwards 4 X 20 display and it works fine.· I'd like something 2,3,4 times bigger that is serial, monochrome is fine and don't really need graphics capability.

· I have had my eye on the 7" display that Parallax sells (item 603-32000, "Mini LCD A/V Color Display") however unlike almost everything on the website I don't see any Prop software or doc's on how to talk to it.

· I bought a 5" display off Ebay hoping to be able to figure out how to talk to it but have been unable to find any doc's on it so it may be a "pretty to look at" display for my junk box.

· What say Prop experts??

Mike B.

Comments

  • Mike GreenMike Green Posts: 23,101
    edited 2010-07-18 15:41
    The 7" display sold by Parallax uses composite video for input, just like what's produced by DVD players, etc. A Propeller can produce this and several Prop boards including the Demo Board, the Backpack, and the Hydra have outputs that plug right into the display. You might look into the Propeller Backpack as a display board since it's designed (among other things) to act as a serial display and comes with pre-installed firmware for this purpose.

    www.parallax.com/StoreSearchResults/tabid/768/txtSearch/backpack/List/0/SortField/4/ProductID/602/Default.aspx

    I've used an Axion 7" TV as a display with several different Prop boards and it seems to work nicely.

    Post Edited (Mike Green) : 7/18/2010 3:51:20 PM GMT
  • LeonLeon Posts: 7,620
    edited 2010-07-18 16:17
    Composite video (PAL or NTSC) is trivial with a Propeller - just three resistors and some software. I've used it with a tiny 3" LCD monitor when demonstrating one of my Propeller boards at a local amateur radio club construction contest.

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    Leon Heller
    Amateur radio callsign: G1HSM
  • Mike B.Mike B. Posts: 31
    edited 2010-07-18 16:24
    Thanks Mr. Green!· This looks like just what I have been looking for!!·· I just downloaded all the files and am off to the computer room to print out the doc's and read it all.·

    Mike B.
  • Mike B.Mike B. Posts: 31
    edited 2010-07-18 16:26
    Thanks Leon.· DE W4FEJ

    I'll be using data radios on the 430 mhz ham bands here for the control of the submarine.· 50 miliwatts to 5 watts in 256 steps.

    Mike B.
  • Mike B.Mike B. Posts: 31
    edited 2010-07-18 16:36
    Wow Mr. Green! Just did a real quick look at the docs and this is EXACTLY what I need!! Thank you so much for pointing me in the right direction!..

    Mike B.
  • LeonLeon Posts: 7,620
    edited 2010-07-18 16:42
    Mike B. said...
    Thanks Leon. DE W4FEJ

    I'll be using data radios on the 430 mhz ham bands here for the control of the submarine. 50 miliwatts to 5 watts in 256 steps.

    Mike B.

    How deep will that work?

    73

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Leon Heller
    Amateur radio callsign: G1HSM
  • AleAle Posts: 2,363
    edited 2010-07-19 03:14
    Can you describe the display you bought ? Maybe post a photo of the back, try to identify signal in the connector(s), name the ICs present... maybe someone knows a bit more...

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Visit some of my articles at Propeller Wiki:
    MATH on the propeller propeller.wikispaces.com/MATH
    pPropQL: propeller.wikispaces.com/pPropQL
    pPropQL020: propeller.wikispaces.com/pPropQL020
    OMU for the pPropQL/020 propeller.wikispaces.com/OMU
    pPropellerSim - A propeller simulator for ASM development sourceforge.net/projects/ppropellersim
  • max72max72 Posts: 1,155
    edited 2010-07-19 13:09
    I'm using sparkfun's huge display www.sparkfun.com/commerce/product_info.php?products_id=8799

    While pin hungry it is rather good, and with a little bit of backlight it is ok also in direct sunlight. Not very fast, on the hother hand.

    It requires 5V and GND.

    Ray posted a sample code on his site.

    www.rayslogic.com/propeller/3rdPartyHardware/3rdPartyHardware.htm

    I made a couple of modifications and he accepted me to post it to obex. The obex driver can use a buffer, the propeller ROM fonts, so you can have big font, also using inverted field (ok when in direct sunlight).

    Massimo
  • Mike B.Mike B. Posts: 31
    edited 2010-07-21 20:39
    Anyone using the SparkFun Huge LCD serial version??· Looks like what I am in the market for..

    I have attached (I think) two photos of the mystery display.· It uses Sanyo chips and I think the display is 320 X 240.· (four chips X 80 plus three chips X 80.

    Mike B.
    lcddisplay1.jpg
    640 x 480 - 60K
    lcddisplay2.jpg
    640 x 480 - 61K
  • John AbshierJohn Abshier Posts: 1,116
    edited 2010-07-21 20:44
    I have a 10.1 inch TV that I bought from Nebraska Furniture Mart for under 100 dollars. It has composite, VGA and audio inputs.

    John Abshier
  • AleAle Posts: 2,363
    edited 2010-07-22 06:16
    Mike: Firstly you have to find out the pin out of the connector using the datasheet of the pseudo controller.
    Then, using maybe the code I posted propeller.wikispaces.com/MonoLCD640, modified so it only outputs 320 pixels instead of 640 and generating the M signal (just a square signal that changes polarity when the LOAD signal rises) you should be able to drive it. Be aware that the bias voltage shuld only be applied when all other signals are in place. Be sure to turn off the bias when no power is connected because the driver ics get damaged. I have a similar display in my hands www.pollin.de/shop/dt/Mzk0OTc4OTk-/Bauelemente/Aktiv/Displays/LCD_Modul_WINTEK_WD_H3224V.html that I need in working this weekend. I'll use as a basis the software of the 640x480 LCD.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Visit some of my articles at Propeller Wiki:
    MATH on the propeller propeller.wikispaces.com/MATH
    pPropQL: propeller.wikispaces.com/pPropQL
    pPropQL020: propeller.wikispaces.com/pPropQL020
    OMU for the pPropQL/020 propeller.wikispaces.com/OMU
    pPropellerSim - A propeller simulator for ASM development sourceforge.net/projects/ppropellersim
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