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EEVblog #801 – How To Design A Digital Clock

EEVblog #801 – How To Design A Digital Clock

The next step for Ahmed Mohamed How to design your own digital clock from 4000 ...

  • rico

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

  • http://koren.es Jose Carlos Moreno

    loved as much as you’ll receive carried out right here. The sketch is attractive, your authored material stylish. nonetheless, you command get bought an shakiness over that you wish be delivering the following. unwell unquestionably come more formerly again since exactly the same nearly a lot often inside case you shield this increase.

  • 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.

  • Mikael Sundin

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

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