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  • EEVblog #248 – LCD Enabled Microcontroller Selection

    Posted on February 29th, 2012 EEVblog 7 comments


    Look over Dave’s shoulder as he tries to select a 7 segment LCD and suitable driving microcontroller.

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    • rico

      octopart http://octopart.com/ is a search engine for electronics parts

    • http://koren.es Jose Carlos Moreno

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    • minifloat

      Well made tutorial, Dave!
      If the lcd you want to use doesn’t need complicated driving waveforms (with 1/3 bias or so), there’s no necessity for a -maybe- more expensive microcontroller with lcd driving capability. A close look at the lcd’s data sheet may point that out.

      Some links i found about driving a lcd with GPIO pins:
      AVR340 appnote: http://www.atmel.com/Images/doc8103.pdf
      AVR241 appnote: http://www.atmel.com/Images/doc2569.pdf
      PIC example: http://mcs.uwsuper.edu/sb/Electronics/TempLCD/

      regards, mf

    • http://www.elproducts.com Chuck

      You probably don’t need the various bias voltage levels with that simple LCD so most of the VLCD pins can be used as ADC.
      This might make the 40 pin work.

    • Leo Bodnar

      You can’t usually “disable” segments in a multiplexed LCD. They still need to be driven otherwise they will pick up charge and start showing through. It is much easier with non-multiplexed LCDs where you can connect unused segments to [a single] COM.
      Leo

    • Mikael Sundin

      Leo Bodnar: You only need one segment pin extra that you connect all unnused segments to.

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