Interfacing LCD without MCU

Discussion in 'General Electronics Chat' started by legolas11, Jun 18, 2015.

  1. legolas11

    Thread Starter Member

    Feb 26, 2013
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    Hi, is it possible to interface a LCD with a circuit output (analog) without a MCU. i mean i dont want to program a MCU, rather want a circuitry for interfacing (if any). any suggessions would be apprecited
     
  2. ScottWang

    Moderator

    Aug 23, 2012
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    What kinds of LCD,as a 20*2, 16*2?
    What is your practical application?
     
  3. takao21203

    Distinguished Member

    Apr 28, 2012
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    its possible but doesnt make much sense. you need decoding IC or ICs

    There is ICL 7107 which has 7seg driver for 4 digits.

    NO info about the LCD.
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
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    This is Pt1 of a 2pt article and shows how to implement it manually, you can take the logic from there.
    Max.
     
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  5. legolas11

    Thread Starter Member

    Feb 26, 2013
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    16x2....the application is a simple voltmeter, displaying the measured voltage from a sensor.
     
  6. legolas11

    Thread Starter Member

    Feb 26, 2013
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    i see. i understand. what would be the simplest MCU based solution then. can you suggest some links.
     
  7. AnalogKid

    Distinguished Member

    Aug 1, 2013
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    With a datasheet and/or user manual for the LCD, it can be done. But plan on lotsa ICs. Sensor int A/D converter, data word or words clocked into a latch, decoded into equivalent BDC digits, multiplexed into LCD with necessary command signals.

    ak
     
  8. nerdegutta

    Moderator

    Dec 15, 2009
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    How much voltage? More than 5v?
     
  9. legolas11

    Thread Starter Member

    Feb 26, 2013
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    no, less than 1 v.

    i am looking for a very small solution. LCD (3 digit is enough) and MCU both must be of small scale.
     
  10. pwdixon

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    Oct 11, 2012
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  11. shteii01

    AAC Fanatic!

    Feb 19, 2010
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  12. nerdegutta

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  13. sirch2

    Well-Known Member

    Jan 21, 2013
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    What about buying a cheap DMM - http://r.ebay.com/pYlNA8 for example - ripping the guts out of it and using that. I know it's got more functions than you want but in terms of time and materials probably cheaper than making your own.
     
  14. ScottWang

    Moderator

    Aug 23, 2012
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    I was think and tried to introduce this kinds of led DVM, but since the TS want to measure less than 1V, so I give up for this, I got this one in hand and designed the circuit for measuring the voltage less than 3V, but not completed yet.
     
  15. ScottWang

    Moderator

    Aug 23, 2012
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    I just thought that this DVM could be using it as voltage monitor and put it with some other stuffs together.
     
  16. pwdixon

    Member

    Oct 11, 2012
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    I think you can measure below 1V on some units it's just a case of having a separate power supply for the display. I haven't bothered to search for one that does measure below 1V that's left up to the OP.
     
  17. legolas11

    Thread Starter Member

    Feb 26, 2013
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    its cool indeed. i need to interface with a A/D since my sensor signal is analog.
     
  18. nerdegutta

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    Dec 15, 2009
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    Detection voltage is from 2.5v - a bit too high for your less than 1v.
     
  19. ScottWang

    Moderator

    Aug 23, 2012
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    Oh, that's great, I will tell my friend that maybe he can buy that kinds of the type next times, thank you.
     
  20. legolas11

    Thread Starter Member

    Feb 26, 2013
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