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2X16 LCD for $3.99, free postage! — Parallax Forums

2X16 LCD for $3.99, free postage!

electrosyselectrosys Posts: 212
edited 2010-05-26 00:06 in General Discussion
Hello Forum,

I have purchased two of these LCDs, get the chance here·at ebay·a 2X16 LCD for only $3.99 with free postage!
(HD44780 Compatible)

Two colors:

jhd162a-01.jpg

jhd162a-03.jpg
·

Comments

  • Dr_AculaDr_Acula Posts: 5,484
    edited 2010-05-14 14:19
    Great find. 20x4 for $10 as well as a whole range of graphics and oled displays.

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    www.smarthome.viviti.com/propeller
  • HollyMinkowskiHollyMinkowski Posts: 1,398
    edited 2010-05-14 18:11
    Nice price!

    Nice enough colors.

    I prefer the dark background/green txt ones but these are OK.
  • HollyMinkowskiHollyMinkowski Posts: 1,398
    edited 2010-05-14 19:44
    I ordered some of these, will post about the quality
    after I get them. Got some of both colors.
  • HollyMinkowskiHollyMinkowski Posts: 1,398
    edited 2010-05-14 21:27
    Here's one for a dime cheaper..LoL smile.gif

    3.89 shipped

    tbu201c.jpg
    cgi.ebay.com/HD44780-1602-16x2-LCM-Character-LCD-Display-Module-New-/220598325240?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item335caf4ff8
  • HollyMinkowskiHollyMinkowski Posts: 1,398
    edited 2010-05-14 21:47
    OK, last chance for the real cheapskates smile.gif

    3.48 shipped

    LCD-1602A-1.jpg

    cgi.ebay.com/NEW-Character-LCD-Module-Display-LCM-1602-16X2-162-blue-/220604499525?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item335d0d8645

    He says if you want several to just make him an offer.
  • iDaveiDave Posts: 252
    edited 2010-05-15 03:02
    These aren't serial lcd's are they? Parallel one are too much hassle.

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    “How much of human life is lost in waiting.” Ralph Waldo Emerson"
  • electrosyselectrosys Posts: 212
    edited 2010-05-15 11:00
    Great, it's going to be cheaper and cheaper yet,...
  • HollyMinkowskiHollyMinkowski Posts: 1,398
    edited 2010-05-15 18:35
    @iDave

    Serial ones just cost too much.

    You can use a cheap AVR to control this type.
    Just epoxy it dead bug style on the back of the lcd board
    and wire it up point to point. You could then send it
    data with a single prop pin. Cover it all up with a liberal
    dose of hot glue. Cover the AVR and wiring with something
    like black epoxy and make it look good and you could sell
    the things for a profit right here on the board...just put
    a lot of useful routines in the AVR code, make it super simple
    to use.

    When I engineer something like this I always use a dip AVR
    and bend the pins flat and snip the pins very short, then epoxy
    it down and do the wiring...the internal adjustable timer is adequate
    for many uses. I customized a lot of cheap parts to make them easy to use
    at my last job..saved many dollars.

    3.48 + 1.50 for the AVR and you have a cheap and custom lcd controlled by one pin.
  • iDaveiDave Posts: 252
    edited 2010-05-15 19:20
    Ahhhhhhh, yes, yes, yes. Sounds right on! Cheaper AND gives one flexibility. I'm interested in AVR'S but t have never used. I have an excess number of picaxe 14m's and 20m's. Could those work?

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    “How much of human life is lost in waiting.” Ralph Waldo Emerson"
  • electrosyselectrosys Posts: 212
    edited 2010-05-15 19:24
    I have·got·a Serial LCD Kit,·preprogrammed PIC & few components, at ebay ($4.95+$1.95 postage) The provider has same Basic Stamp sample codes·as well. The kit has no PCB, but you can buy a ready one here ($5+$2)·or just assemble it at the little pieces of PCB.·For additional details and sample routines: web site.
  • Martin_HMartin_H Posts: 4,051
    edited 2010-05-15 19:30
    Could a serial to parallel shift register like the 74HC595 reduce the number of pins used? Or would that make things even more complicated? I don't know how to program an AVR.
  • HollyMinkowskiHollyMinkowski Posts: 1,398
    edited 2010-05-15 19:35
    I'm not familiar with picaxe...I use lots of AVR tiny chips.
    My favorites are the tiny85 and 84 and the Atmega644, 168
    and 328.

    You need a cheap AVR with enough I/O pins for the lcd display.
    That makes the 8 pin tiny chips a no go but a larger tiny with
    more pins is perfect. If you use 4 bit mode on the lcd you need
    fewer I/O pins. A tiny84 should work. Less than 2 dollars and
    has a whopping 8k of flash so you could code a bunch of nice
    routines....you could make it really special.

    If you modded one of these cheap lcd displays you would have
    a nice display for five dollars that could be controlled even from
    an 8 pin AVR tiny chip smile.gif

    I wonder if people would buy such a thing for ten dollars?
    If so you would double your money with just a small bit
    of assembly work.
  • HollyMinkowskiHollyMinkowski Posts: 1,398
    edited 2010-05-15 19:48
    I bet if you bought 100 of these displays you could get the per unit down
    around 2.5 dollars. The guy said to make an offer on large quantities.
    Then buy 100 tiny chips at mouser and you would be looking
    at a hardware cost per modified display of slightly less than 4.00

    Sell them for 9.99 each and you would make money.
    If it catches on though the China sellers would create the
    same thing and sell it cheaper....but you would have the market for a while.
  • HollyMinkowskiHollyMinkowski Posts: 1,398
    edited 2010-05-15 19:52
    @electrosys

    Same basic and simple idea.

    But mounting a tiny AVR dead bug style on back of the lcd
    and selling a wired unit is a better idea I think.

    @Martin_H

    That would just complicate a simple idea.
    The price difference between an 8pin AVR and a larger one is
    smaller than the cost of adding the extra chip you see.

    Post Edited (HollyMinkowski) : 5/15/2010 7:57:00 PM GMT
  • HighlandtinkerHighlandtinker Posts: 50
    edited 2010-05-15 20:27
    Here is a real good board for use on the LCDs being talked about.

    http://wulfden.org/TheShoppe/k107/k107.shtml

    You can get just the pcb, a pcb with pre programed Pic chip or a complete kit. It is based on the same kit that electrosys·is talking about but more refined.· I use these alot on LCDs I get Off ebay.
    Hope this info helps.

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    · Scott
  • electrosyselectrosys Posts: 212
    edited 2010-05-16 11:27
    @HollyMinkowski

    You are right, if you need lots of (serial) LCDs for same product, that will make a big difference in the prices, but if we taking about a few LCDs for hobby projects, then it's only a few bucks to save, and do not forget the difficulty of the Assembly and AVR works.

    One more:·

    SpakFun has a Serial enabled LCD·backpack,·the source·code·(C and HEX for PIC16F688/684) Datasheet, Pin assignment and Schematic, are·free to download·for personal use.

    00258-03-L_i_ma.jpg
  • RavenkallenRavenkallen Posts: 1,057
    edited 2010-05-16 18:06
    If i wanted a serial lcd i would just get one on mouser for like $22. No hassle.

    http://www.mouser.com/ProductDetail/Newhaven-Display/NHD-0220D3Z-FL-GBW/?qs=sGAEpiMZZMtqO%2bWUGLBzeC3eNvCBKpVr

    Yes, it would also be possible to interface a parallel display to a picaxe. I do it all the time. But for ease of use, i would just buy a serial one....
  • Martin_HMartin_H Posts: 4,051
    edited 2010-05-26 00:06
    Once again this forum gets me to spend money. Rather than buy a cheap parallel LCD off E-bay I bought a complete kit using the 117 serial controller chip in the thread above. It should be fun to assemble and I always find I learn more about home something works by dealing with the parts and seeing how they interconnect.
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