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Current measureing — Parallax Forums

Current measureing

ArchiverArchiver Posts: 46,084
edited 2000-11-12 20:52 in General Discussion
What is the best way to convert a current to a voltage? Ineed to read
current draw with a ADC. Thanks for any help.


MH

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2000-11-12 05:48
    Simpliest way is to use a small value resistance in series with the
    current and measure the voltage drop across it (V=IR).

    Of course, you don't state what current range you need to measure, so
    make sure you use a resistor capable of handling the power it needs
    to dissapate.

    -Martin Hebel
    http://www.selmaware.com
    &
    http://www.siu.edu/~imsasa/elm

    --- In basicstamps@egroups.com, "Michael Hendricks" <mjh80@b...>
    wrote:
    > What is the best way to convert a current to a voltage? Ineed to
    read
    > current draw with a ADC. Thanks for any help.
    >
    >
    > MH
  • ArchiverArchiver Posts: 46,084
    edited 2000-11-12 15:55
    Use a Dallas semiconductor DS2760.
  • ArchiverArchiver Posts: 46,084
    edited 2000-11-12 20:52
    In serial with wire you need to put some resistance and on both ends you
    will have VOLTAGE. Depend of resistance voltage will be small or high.
    For instance if you need to convert 4-20 mA current you need to put 500 OHM
    and on resistor you can measure voltage between 2 -10 V.
    I think this will help you.
    Original Message
    From: "Michael Hendricks" <mjh80@b...>
    To: <basicstamps@egroups.com>
    Sent: Saturday, November 11, 2000 8:14 PM
    Subject: [noparse][[/noparse]basicstamps] Current measureing


    > What is the best way to convert a current to a voltage? Ineed to read
    > current draw with a ADC. Thanks for any help.
    >
    >
    > MH
    >
    >
    >
    >
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