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Converting a digital signal to LCD DISPLAY — Parallax Forums

Converting a digital signal to LCD DISPLAY

ArchiverArchiver Posts: 46,084
edited 2001-12-04 22:08 in General Discussion
I have a signal wire that varies from 0v to 1v. I want to express it
on a 3 digit LCD display. [noparse][[/noparse].xxx]. I bought a LM3914 from Radio
Shack, but I do not know if it will work with an lcd display. It
seems it just lights up LEDs from low to high. If anyone can help me
or point me in the right direction, I would greatly appreciate it!

Thanks
Rick

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2001-12-04 20:19
    Hi Rick,

    The LM3914 is a dot-bar LED display driver, like a VU-meter on audio
    devices.
    If you want to measure a voltage and display it on a LCD, you need a more
    specific chip, containing an analog-to-digital converter and a display
    driver. You also need a numeric LCD display.
    You should have a look at Maxim's website (http://www.maxim-ic.com/). They
    have a lot of chips to do that job (ICL7106, MAX136...).

    Another solution, if you want to use a Stamp, is to connect the outputs of
    the LM3914 to the Stamp, and program it to drive an alphanumeric LCD
    display... but this is more complex and require programming. Depends on what
    you want to do...

    Hope this helps...

    Best regards,

    Phil.
    Original Message
    From: <rblundel@t...>
    To: <basicstamps@yahoogroups.com>
    Sent: Tuesday, December 04, 2001 5:06 AM
    Subject: [noparse][[/noparse]basicstamps] Converting a digital signal to LCD DISPLAY


    > I have a signal wire that varies from 0v to 1v. I want to express it
    > on a 3 digit LCD display. [noparse][[/noparse].xxx]. I bought a LM3914 from Radio
    > Shack, but I do not know if it will work with an lcd display. It
    > seems it just lights up LEDs from low to high. If anyone can help me
    > or point me in the right direction, I would greatly appreciate it!
    >
    > Thanks
    > Rick
    >
    >
    > To UNSUBSCRIBE, just send mail to:
    > basicstamps-unsubscribe@yahoogroups.com
    > from the same email address that you subscribed. Text in the Subject and
    Body of the message will be ignored.
    >
    >
    > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
    >
    >
    >
  • ArchiverArchiver Posts: 46,084
    edited 2001-12-04 22:08
    There are lots of Digital Panel Meters for 15.00 or less I have one with 4
    digit led display look at all electronics WWW.allelectronics.com
    Original Message
    From: "Philippe Derenne" <derennep@s...>
    To: <basicstamps@yahoogroups.com>
    Sent: December 04, 2001 12:19 PM
    Subject: Re: [noparse][[/noparse]basicstamps] Converting a digital signal to LCD DISPLAY


    | Hi Rick,
    |
    | The LM3914 is a dot-bar LED display driver, like a VU-meter on audio
    | devices.
    | If you want to measure a voltage and display it on a LCD, you need a more
    | specific chip, containing an analog-to-digital converter and a display
    | driver. You also need a numeric LCD display.
    | You should have a look at Maxim's website (http://www.maxim-ic.com/). They
    | have a lot of chips to do that job (ICL7106, MAX136...).
    |
    | Another solution, if you want to use a Stamp, is to connect the outputs of
    | the LM3914 to the Stamp, and program it to drive an alphanumeric LCD
    | display... but this is more complex and require programming. Depends on
    what
    | you want to do...
    |
    | Hope this helps...
    |
    | Best regards,
    |
    | Phil.
    |
    |
    Original Message
    | From: <rblundel@t...>
    | To: <basicstamps@yahoogroups.com>
    | Sent: Tuesday, December 04, 2001 5:06 AM
    | Subject: [noparse][[/noparse]basicstamps] Converting a digital signal to LCD DISPLAY
    |
    |
    | > I have a signal wire that varies from 0v to 1v. I want to express it
    | > on a 3 digit LCD display. [noparse][[/noparse].xxx]. I bought a LM3914 from Radio
    | > Shack, but I do not know if it will work with an lcd display. It
    | > seems it just lights up LEDs from low to high. If anyone can help me
    | > or point me in the right direction, I would greatly appreciate it!
    | >
    | > Thanks
    | > Rick
    | >
    | >
    | > To UNSUBSCRIBE, just send mail to:
    | > basicstamps-unsubscribe@yahoogroups.com
    | > from the same email address that you subscribed. Text in the Subject
    and
    | Body of the message will be ignored.
    | >
    | >
    | > Your use of Yahoo! Groups is subject to
    http://docs.yahoo.com/info/terms/
    | >
    | >
    | >
    |
    |
    | To UNSUBSCRIBE, just send mail to:
    | basicstamps-unsubscribe@yahoogroups.com
    | from the same email address that you subscribed. Text in the Subject and
    Body of the message will be ignored.
    |
    |
    | Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
    |
    |
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