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9948Re: [cosmacelf] Re: Seven Segment Displays

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  • Raymond Siminas
    Apr 3 6:01 PM
      The bulk of the serial LCD displays that I've seen are used with the BASIC Stamp microcontroller.  You may want to look at one of those, keeping in mind that what Lee's saying is correct.


      --- On Tue, 4/3/12, Lee Hart <leeahart@...> wrote:

      From: Lee Hart <leeahart@...>
      Subject: Re: [cosmacelf] Re: Seven Segment Displays
      To: cosmacelf@yahoogroups.com
      Date: Tuesday, April 3, 2012, 5:46 PM


      On 4/3/2012 6:31 PM, eight_bit_jdrose wrote:

      Lee Hart wrote:

      >>> I have used the 2X16 character displays like

      >>> http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_2118580_-1

      > Mr. Hart, That is a nice, contrasty display at a decent price.

      > Do you know if there is a version of this display that is serial instead?

      I'm not the original poster. I haven't used this particular one, but I

      have used a number of similar ones. There are *hundreds* of them on the

      market! Almost all of them have 4-bit or 8-bit parallel interfaces. The

      protocol varies from display to display, so you *need* to have

      documentation on it, or you'll spend/waste a lot of time

      reverse-engineering it.

      To get a serial I2C interface, they add a microcomputer. To get an

      asynchronous serial interface (RS-232 etc.), it also needs a stable

      accurate clock forthe baud rate. These add cost. Typically, they make a

      little board with the micro and associated parts for the serial

      interface, and then plug in some generic LCD module with a parallel

      interface onto it. These generally sell for $20 and up (i.e. about twice

      the cost of the parallel LCD modules alone).


      An engineer can do for a nickel what any damn fool can do for a dollar.

      -- Henry Ford


      Lee A. Hart, 814 8th Ave N, Sartell MN 56377, leeahart at earthlink.net

      [Non-text portions of this message have been removed]
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