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Measuring DC Amps. — Parallax Forums

Measuring DC Amps.

ArchiverArchiver Posts: 46,084
edited 2003-02-28 13:50 in General Discussion
I saw on the basic stamp nots on how to measure DC volts.

Just wondering if anyone has any resources on measuring DC amps ? I've
tried looking on google but cant find any info (saw a lot of voltage
measurements), I dun mind adding a few more compoenents to the stamp, but
just want to keep costs down.

I've to test some items that are 14-15v, and will range from 0 to 10amps+
(No i dun need to use the clamps)

Thanks in advance..

Elvin
-

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2003-02-27 10:26
    What about the following circuit:


    v Idc
    | |
    | +
    to ADC Analog In
    | |
    | /
    | \ Rs
    | /
    | |
    +
    +
    to ADC GND

    Rs shunt resistor according to current and compliance voltage,
    eg. 1R00 for 1V/1A, or 0R1 for 1V/10A.

    Regards
    Adrian
  • ArchiverArchiver Posts: 46,084
    edited 2003-02-27 13:09
    That's what we do. Usually use a 0.1 Ohm resistor. However, there are
    places that sell shunt resistors. A shunt resistor is calibraged to
    give a 50 or 100 mV drop across it at the maximum rated current. For
    example, 50 mV= 500 Amps. They can be used on dc or ac, and usually are
    designed to be temperature insensitive. If 50 mV is too little for the
    A2D, then a small op amp amplifying the output of the shunt is
    appropriate. I've done this on several projects and it works well. The
    idea is to have the resistor small enough so that it doesn't interfere
    with the circuit (or get hot), and yet large enough to have a Voltage
    drop that is measureable<G>.

    Original Message
    From: Adrian Schneider <adrian.schneider@t...>
    [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=sOz8PZEx7SBB0lSaRnWMSFrctF55MeO204OslQR3_rQHgSfw4QLPDsjbme7I9567JWu0gbMyDDrs5KrZ4a_KHTmXDhoAKAIwgA]adrian.schneider@t...[/url
    Sent: Thursday, February 27, 2003 5:26 AM
    To: basicstamps@yahoogroups.com
    Subject: [noparse][[/noparse]basicstamps] Re: Measuring DC Amps.


    What about the following circuit:


    v Idc
    | |
    | +
    to ADC Analog In
    | |
    | /
    | \ Rs
    | /
    | |
    +
    +
    to ADC GND

    Rs shunt resistor according to current and compliance voltage, eg. 1R00
    for 1V/1A, or 0R1 for 1V/10A.

    Regards
    Adrian


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  • ArchiverArchiver Posts: 46,084
    edited 2003-02-27 15:52
    The DS2760 from Dallas, a 1-wire device, will measure both voltage and
    current.
    Chuck
  • ArchiverArchiver Posts: 46,084
    edited 2003-02-27 16:00
    I'm a mech type and reading the apps notes for this product I'm having a
    tough time visualizing how it can be used in the in the original post of 15
    volts and up to 10 amps, What am I missing in the reading of this chip.

    Can you explain a little better for an dumb old nuts and bolts guy

    Original Message
    From: CHIPKEN@a... [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=BaW1tPIK2GDjGSN99K7ev4tiA7S1OHGZyf2rIJ_wYC2kw-i7GX_PlG3r5RL8Kjwjf1ZoBkn-oT8J]CHIPKEN@a...[/url
    Sent: Thursday, February 27, 2003 10:52 AM
    To: basicstamps@yahoogroups.com
    Subject: Re: [noparse][[/noparse]basicstamps] Measuring DC Amps.

    The DS2760 from Dallas, a 1-wire device, will measure both voltage and
    current.
    Chuck

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    [noparse][[/noparse]Non-text portions of this message have been removed]
  • ArchiverArchiver Posts: 46,084
    edited 2003-02-27 16:38
    http://www.allelectronics.com/cgi-bin/category.cgi

    you will be looking for part # snt-50
    its a 50 amp shunt bar a bit of over kill but for $12.00



    Larry Gaminde


    Original Message
    From: "Sadler Porter" <porter.sadler@s...>
    To: <basicstamps@yahoogroups.com>
    Sent: February 27, 2003 8:00 AM
    Subject: RE: [noparse][[/noparse]basicstamps] Measuring DC Amps.


    : I'm a mech type and reading the apps notes for this product I'm
    having a
    : tough time visualizing how it can be used in the in the original
    post of 15
    : volts and up to 10 amps, What am I missing in the reading of this
    chip.
    :
    : Can you explain a little better for an dumb old nuts and bolts guy
    :
    :
    Original Message
    : From: CHIPKEN@a... [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=40sUm1Ev7QFSwrWbWfpKwkSFCWqhRmWTpwW3OId1WrT7YswMTg9JEJHPgeNEutqfrcm9Qs0]CHIPKEN@a...[/url
    : Sent: Thursday, February 27, 2003 10:52 AM
    : To: basicstamps@yahoogroups.com
    : Subject: Re: [noparse][[/noparse]basicstamps] Measuring DC Amps.
    :
    : The DS2760 from Dallas, a 1-wire device, will measure both voltage
    and
    : current.
    : Chuck
    :
    : 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/
    :
    :
    :
    : [noparse][[/noparse]Non-text portions of this message have been removed]
    :
    :
    : 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.
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    :
    :
  • ArchiverArchiver Posts: 46,084
    edited 2003-02-27 17:50
    Take a look at "Maxim Engineering Journal Vol. Four". They will you a
    layman's view of 1-wire technology. You will, also, need a BS2p to make the
    pbasic code easy. I think on the Parallax web site you can find some example
    code to get started.
    The DS2760 has a 25 micro ohm shunt that you measure the voltage drop across
    via the DS2760. You will, also, need a voltage divider to reduce your 15 vdc
    down to 5 vdc to power the DS2760. This power input voltage can be measured
    by the DS2760.
    Chuck
  • ArchiverArchiver Posts: 46,084
    edited 2003-02-28 02:38
    I'm rusty on my electronics so pardon me.

    So the ghist is to measure voltage across the resistor to get the amps ?
    (V = I * R)

    I just got more info from my fren (who's asking me to build this) is that
    he has 12 x 1.2v battery cells which he's hooked up to a charger and he
    wants to constantly meausre the current level in the batterys to track
    performance,etc.. (I'll hook this up to a basic stamp which will interface
    with a LCD display to graph data every 5min+)


    Elvin
    -

    On Thu, 27 Feb 2003, Grover Richardson wrote:

    > Date: Thu, 27 Feb 2003 08:09:36 -0500
    > From: Grover Richardson <grover.richardson@g...>
    > Reply-To: basicstamps@yahoogroups.com
    > To: basicstamps@yahoogroups.com
    > Subject: RE: [noparse][[/noparse]basicstamps] Re: Measuring DC Amps.
    >
    > That's what we do. Usually use a 0.1 Ohm resistor. However, there are
    > places that sell shunt resistors. A shunt resistor is calibraged to
    > give a 50 or 100 mV drop across it at the maximum rated current. For
    > example, 50 mV= 500 Amps. They can be used on dc or ac, and usually are
    > designed to be temperature insensitive. If 50 mV is too little for the
    > A2D, then a small op amp amplifying the output of the shunt is
    > appropriate. I've done this on several projects and it works well. The
    > idea is to have the resistor small enough so that it doesn't interfere
    > with the circuit (or get hot), and yet large enough to have a Voltage
    > drop that is measureable<G>.
    >
    >
    Original Message
    > From: Adrian Schneider <adrian.schneider@t...>
    > [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=XGPCOdqgclXxxKmfZiqC8yyNlhuOtDdMw35Tv_Hj-6Ahhv3w8PyKjS1tT9jLiMKX07Brsup1zeC3jMZ7AWaRYWDn_PTeFdce4Q]adrian.schneider@t...[/url
    > Sent: Thursday, February 27, 2003 5:26 AM
    > To: basicstamps@yahoogroups.com
    > Subject: [noparse][[/noparse]basicstamps] Re: Measuring DC Amps.
    >
    >
    > What about the following circuit:
    >
    >
    > v Idc
    > | |
    > | +
    to ADC Analog In
    > | |
    > | /
    > | \ Rs
    > | /
    > | |
    > +
    +
    to ADC GND
    >
    > Rs shunt resistor according to current and compliance voltage, eg. 1R00
    > for 1V/1A, or 0R1 for 1V/10A.
    >
    > Regards
    > Adrian
    >
    >
    > 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/
    >
    >
    >
  • ArchiverArchiver Posts: 46,084
    edited 2003-02-28 04:23
    i might be wrong but the only way i know to gage
    battery performance is to measure both charge and
    discharge thrue a known constant load
    just a thought. [noparse]:)[/noparse]

    --- Alf <elvin@e...> wrote:
    > I'm rusty on my electronics so pardon me.
    >
    > So the ghist is to measure voltage across the
    > resistor to get the amps ?
    > (V = I * R)
    >
    > I just got more info from my fren (who's asking me
    > to build this) is that
    > he has 12 x 1.2v battery cells which he's hooked up
    > to a charger and he
    > wants to constantly meausre the current level in the
    > batterys to track
    > performance,etc.. (I'll hook this up to a basic
    > stamp which will interface
    > with a LCD display to graph data every 5min+)
    >
    >
    > Elvin
    > -
    >
    > On Thu, 27 Feb 2003, Grover Richardson wrote:
    >
    > > Date: Thu, 27 Feb 2003 08:09:36 -0500
    > > From: Grover Richardson
    > <grover.richardson@g...>
    > > Reply-To: basicstamps@yahoogroups.com
    > > To: basicstamps@yahoogroups.com
    > > Subject: RE: [noparse][[/noparse]basicstamps] Re: Measuring DC Amps.
    > >
    > > That's what we do. Usually use a 0.1 Ohm
    > resistor. However, there are
    > > places that sell shunt resistors. A shunt
    > resistor is calibraged to
    > > give a 50 or 100 mV drop across it at the maximum
    > rated current. For
    > > example, 50 mV= 500 Amps. They can be used on dc
    > or ac, and usually are
    > > designed to be temperature insensitive. If 50 mV
    > is too little for the
    > > A2D, then a small op amp amplifying the output of
    > the shunt is
    > > appropriate. I've done this on several projects
    > and it works well. The
    > > idea is to have the resistor small enough so that
    > it doesn't interfere
    > > with the circuit (or get hot), and yet large
    > enough to have a Voltage
    > > drop that is measureable<G>.
    > >
    > >
    Original Message
    > > From: Adrian Schneider
    > <adrian.schneider@t...>
    > > [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=8T6mN2CC48SivlVrVzQSryhimknDFJRRHsW_3XgS3VVLpmYBcgsDzx5o7TBmxKKFnr7rqbJ-3ZrO1YYwiKA_jm-1aJPCY0vP]adrian.schneider@t...[/url
    > > Sent: Thursday, February 27, 2003 5:26 AM
    > > To: basicstamps@yahoogroups.com
    > > Subject: [noparse][[/noparse]basicstamps] Re: Measuring DC Amps.
    > >
    > >
    > > What about the following circuit:
    > >
    > >
    > > v Idc
    > > | |
    > > | +
    to ADC Analog In
    > > | |
    > > | /
    > > | \ Rs
    > > | /
    > > | |
    > > +
    +
    to ADC GND
    > >
    > > Rs shunt resistor according to current and
    > compliance voltage, eg. 1R00
    > > for 1V/1A, or 0R1 for 1V/10A.
    > >
    > > Regards
    > > Adrian
    > >
    > >
    > > 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/
    > >
    > >
    > >
    >
    >
    > 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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  • ArchiverArchiver Posts: 46,084
    edited 2003-02-28 13:37
    Not a problem, I've got "old timers" disease myself<G>. It's early
    onset (I don't consider myself thhaaatt old<G>).

    Yes. Measure a small Voltage across a resistor and calculate the amps.


    The way that we've done it in the past is to (stating it somewhat oddly
    here for clarity<G>) use the battery negative terminal for ground for
    the entire system. Connect up everything as it will be run normally.
    Now, lift the negative lead from the battery charger which is
    connected to the negative side of the battery stack. Put the small
    resistor between that lead and the "ground," which is the negative side
    of the battery stack. This will allow you to have a quality ground for
    the system. It will also allow you to read the Voltage on the resistor
    relative to ground, which is a one wire measurement. The polarity will
    be backwards, but can be dealt with in calculations.
    I've read resistors on the high side of the batteries, and
    trying to get a small .02 Volt difference when both sides are floating
    at 8-9 Volts is not as simple as it seems<G>.

    Sounds like you are measuring Nicads. If you are using a 10%
    charge, but using a high rate of discharge, you should calculate the
    power dissipated in the resistor during high rates of discharge. This
    ensures that it will survive and not become an impromptu fuse<G>.

    Personally, I like the old style carbon composition resistors.
    They are non-inductive and perform well. If you need to know EXACTLY
    how much the current is when using junk box non-precision resistors, you
    can use a multimeter to measure a power supply Voltage, and then measure
    the current through the resistor. This will give the exact resistance
    of the resistor (through calculation), and saves the effort of finding a
    1% resistor. This sounds like false economy, but at home, I have to use
    what I have lying around<G>.

    Make sense?

    Original Message
    From: Alf [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=cBycoHHc5lXHc-gwIs4v9YHirwE9i0d-QE4eZQqIgvic9_W8ORYPMKanFHLf651YYn2XwsU3]elvin@e...[/url
    Sent: Thursday, February 27, 2003 9:38 PM
    To: basicstamps@yahoogroups.com
    Subject: RE: [noparse][[/noparse]basicstamps] Re: Measuring DC Amps.


    I'm rusty on my electronics so pardon me.

    So the ghist is to measure voltage across the resistor to get the amps ?

    (V = I * R)

    I just got more info from my fren (who's asking me to build this) is
    that
    he has 12 x 1.2v battery cells which he's hooked up to a charger and he
    wants to constantly meausre the current level in the batterys to track
    performance,etc.. (I'll hook this up to a basic stamp which will
    interface
    with a LCD display to graph data every 5min+)


    Elvin
    -

    On Thu, 27 Feb 2003, Grover Richardson wrote:

    > Date: Thu, 27 Feb 2003 08:09:36 -0500
    > From: Grover Richardson <grover.richardson@g...>
    > Reply-To: basicstamps@yahoogroups.com
    > To: basicstamps@yahoogroups.com
    > Subject: RE: [noparse][[/noparse]basicstamps] Re: Measuring DC Amps.
    >
    > That's what we do. Usually use a 0.1 Ohm resistor. However, there
    > are places that sell shunt resistors. A shunt resistor is calibraged
    > to give a 50 or 100 mV drop across it at the maximum rated current.
    > For example, 50 mV= 500 Amps. They can be used on dc or ac, and
    > usually are designed to be temperature insensitive. If 50 mV is too
    > little for the A2D, then a small op amp amplifying the output of the
    > shunt is appropriate. I've done this on several projects and it works

    > well. The idea is to have the resistor small enough so that it
    > doesn't interfere with the circuit (or get hot), and yet large enough
    > to have a Voltage drop that is measureable<G>.
    >
    >
    Original Message
    > From: Adrian Schneider <adrian.schneider@t...>
    > [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=CV1Apv_PS-F3vA78CNLKB9o2cFnYdpIIJVK68F0mY_ECfKKM8zO2NE4WXURxsHo7AqlmBiyLoN7o4UtXnxjzsUfJ1K9NhA7f]adrian.schneider@t...[/url
    > Sent: Thursday, February 27, 2003 5:26 AM
    > To: basicstamps@yahoogroups.com
    > Subject: [noparse][[/noparse]basicstamps] Re: Measuring DC Amps.
    >
    >
    > What about the following circuit:
    >
    >
    > v Idc
    > | |
    > | +
    to ADC Analog In
    > | |
    > | /
    > | \ Rs
    > | /
    > | |
    > +
    +
    to ADC GND
    >
    > Rs shunt resistor according to current and compliance voltage, eg.
    > 1R00 for 1V/1A, or 0R1 for 1V/10A.
    >
    > Regards
    > Adrian
    >
    >
    > 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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  • ArchiverArchiver Posts: 46,084
    edited 2003-02-28 13:50
    Yes. Measuring the ampacity of the battery lets you know how much life
    is left. I guess Elvin is trying to keep up with how much power is left
    through "coloumb counting."



    Original Message
    From: kenneth magers [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=oRbUKQSuORo2sS2zDodNAK0_hDWtmupBpNXtdZ2BpmVA12KN4Hli76d4_o6dm8KsCcq24P3hPEZGNc10xv5BLNPJJg]kenneth_m_73149@y...[/url
    Sent: Thursday, February 27, 2003 11:23 PM
    To: basicstamps@yahoogroups.com
    Subject: RE: [noparse][[/noparse]basicstamps] Re: Measuring DC Amps.


    i might be wrong but the only way i know to gage
    battery performance is to measure both charge and
    discharge thrue a known constant load
    just a thought. [noparse]:)[/noparse]

    --- Alf <elvin@e...> wrote:
    > I'm rusty on my electronics so pardon me.
    >
    > So the ghist is to measure voltage across the
    > resistor to get the amps ?
    > (V = I * R)
    >
    > I just got more info from my fren (who's asking me
    > to build this) is that
    > he has 12 x 1.2v battery cells which he's hooked up
    > to a charger and he
    > wants to constantly meausre the current level in the
    > batterys to track
    > performance,etc.. (I'll hook this up to a basic
    > stamp which will interface
    > with a LCD display to graph data every 5min+)
    >
    >
    > Elvin
    > -
    >
    > On Thu, 27 Feb 2003, Grover Richardson wrote:
    >
    > > Date: Thu, 27 Feb 2003 08:09:36 -0500
    > > From: Grover Richardson
    > <grover.richardson@g...>
    > > Reply-To: basicstamps@yahoogroups.com
    > > To: basicstamps@yahoogroups.com
    > > Subject: RE: [noparse][[/noparse]basicstamps] Re: Measuring DC Amps.
    > >
    > > That's what we do. Usually use a 0.1 Ohm
    > resistor. However, there are
    > > places that sell shunt resistors. A shunt
    > resistor is calibraged to
    > > give a 50 or 100 mV drop across it at the maximum
    > rated current. For
    > > example, 50 mV= 500 Amps. They can be used on dc
    > or ac, and usually are
    > > designed to be temperature insensitive. If 50 mV
    > is too little for the
    > > A2D, then a small op amp amplifying the output of
    > the shunt is
    > > appropriate. I've done this on several projects
    > and it works well. The
    > > idea is to have the resistor small enough so that
    > it doesn't interfere
    > > with the circuit (or get hot), and yet large
    > enough to have a Voltage
    > > drop that is measureable<G>.
    > >
    > >
    Original Message
    > > From: Adrian Schneider
    > <adrian.schneider@t...>
    > > [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=FvIdoVs7AAkNaySwDAgXYbUQzW7qmyPeIX_6yOmJW5Rj08w_jHCLiFsKhbX7-DrRent5rByDy9bWvoeVonmF0-7oUjNR6KgEnA]adrian.schneider@t...[/url
    > > Sent: Thursday, February 27, 2003 5:26 AM
    > > To: basicstamps@yahoogroups.com
    > > Subject: [noparse][[/noparse]basicstamps] Re: Measuring DC Amps.
    > >
    > >
    > > What about the following circuit:
    > >
    > >
    > > v Idc
    > > | |
    > > | +
    to ADC Analog In
    > > | |
    > > | /
    > > | \ Rs
    > > | /
    > > | |
    > > +
    +
    to ADC GND
    > >
    > > Rs shunt resistor according to current and
    > compliance voltage, eg. 1R00
    > > for 1V/1A, or 0R1 for 1V/10A.
    > >
    > > Regards
    > > Adrian
    > >
    > >
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