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voltage measurement — Parallax Forums

voltage measurement

ArchiverArchiver Posts: 46,084
edited 2004-05-05 02:00 in General Discussion
Hi Stampers !!

Can somebody PLEASE help me !!

I have bought the BS1 and I want to send every watt hour an impulse to an
external counter.
The BS1 have to build the product between voltage, time and electric current
(W= U*I*t).
I can measure the elec. current over an low-ohm-resistor as a voltage.
Can anyone help me to create a circuitry and help me to find the right
PBasic commands?

Yours faithfully,

jens eckelman
--
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J e n s E c k e l m a n n

Geseniusweg 7
D-30625 Hannover
Germany

fax ¦ +49(0)121 2514850789
mp ¦ +49 (0)175 6945556


e-mail ¦ jens.eckelmann@g...
e-mail ¦ jens.eckelmann@w...
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Comments

  • ArchiverArchiver Posts: 46,084
    edited 2002-06-30 02:05
    Is it possible for the stamp to measure input voltages instead of a
    high or low. Can it distinguish between 5vdc or 6vdc? Thanks, Chris
  • ArchiverArchiver Posts: 46,084
    edited 2002-06-30 07:06
    >Is it possible for the stamp to measure input voltages instead of a
    >high or low. Can it distinguish between 5vdc or 6vdc? Thanks, Chris

    http://www.emesystems.com/BS2rct.htm#B_voltage
  • ArchiverArchiver Posts: 46,084
    edited 2003-01-10 16:20
    Hai, I am realtively new to basicstamp-electronics

    I have an analoge distance-mesurements-sensor which outputs a voltage
    signal between 0.4 and 2.6 volt (80-10 cm.)
    Is there an easy way to connect this snesor to the bascistamp 2 and
    measure the voltage?

    thanks harco
  • ArchiverArchiver Posts: 46,084
    edited 2003-01-10 16:47
    You will likely want to run the analoge output of your distance sensor into
    an A/D converter then feed the binary output into the stamp.


    [noparse][[/noparse]Non-text portions of this message have been removed]
  • ArchiverArchiver Posts: 46,084
    edited 2003-01-10 17:03
    Harco,

    What you are looking for is an analog to digital converter (ADC or A/D). I
    have used the LTC1298 for this purpose, and it works well. There are many
    other A/D converters out there, and they all basically work the same way.
    They compare your input voltage to a reference voltage and spit out a number
    based on the difference between the voltages. Depending on what resolution
    you need and what reference voltage you will use, anywhere from a 8 bit to a
    12 bit A/D will probably work for you.


    Jonathan

    www.madlabs.info

    Original Message
    From: <harco@p...>
    To: <basicstamps@yahoogroups.com>
    Sent: Friday, January 10, 2003 8:20 AM
    Subject: [noparse][[/noparse]basicstamps] voltage measurement


    > Hai, I am realtively new to basicstamp-electronics
    >
    > I have an analoge distance-mesurements-sensor which outputs a voltage
    > signal between 0.4 and 2.6 volt (80-10 cm.)
    > Is there an easy way to connect this snesor to the bascistamp 2 and
    > measure the voltage?
    >
    > thanks harco
    >
    >
    >
    > 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 2003-01-10 17:41
    The Stamps manual details all one would need to know about selecting
    and using an ADC chip.

    the TLC1298 is 11 channel ?

    for accuracy purposes, you may want to scale the signal from the
    snesor so the full scale is 0-5 volts.
    Also, if you chose a dual channel ADC, you could use a second amp to
    scale the snesor output for some much higher range so you get higher
    accuracy or at least higher sensitivity in a particular range.

    For example if you sensor was set for 0 to 5 feet. and the ADC input
    was 10 bit, the current voltage of 04. to 2.6 is a range of 2.2
    volts. roughly that would input only 5 of the 10 bits. so the 5 foot
    sensor range would wind up being about 10 foot as far as the snesor
    goes. ie: 0-2.2 volts= the first 5 feet, 2.3-5 volts is the 'other' 5
    feet, but unused.

    By putting the snesor output thru an amp, you could set if for 0-5
    volts for the full distance.

    with a second ADC channel, you could then use another amp and pump
    the signal up to the first foot was an output of 0-5 volts thereby
    getting much higher resolution from the same snesor.

    Any snesor would work, and a distance snesor or temperature snesor or
    pressure snesor would work. (I am enjoying saying snesor)

    Dave








    --- In basicstamps@yahoogroups.com, "Jonathan Peakall"
    <jpeakall@m...> wrote:
    > Harco,
    >
    > What you are looking for is an analog to digital converter (ADC or
    A/D). I
    > have used the LTC1298 for this purpose, and it works well. There
    are many
    > other A/D converters out there, and they all basically work the
    same way.
    > They compare your input voltage to a reference voltage and spit out
    a number
    > based on the difference between the voltages. Depending on what
    resolution
    > you need and what reference voltage you will use, anywhere from a 8
    bit to a
    > 12 bit A/D will probably work for you.
    >
    >
    > Jonathan
    >
    > www.madlabs.info
    >
    >
    >
    Original Message
    > From: <harco@p...>
    > To: <basicstamps@yahoogroups.com>
    > Sent: Friday, January 10, 2003 8:20 AM
    > Subject: [noparse][[/noparse]basicstamps] voltage measurement
    >
    >
    > > Hai, I am realtively new to basicstamp-electronics
    > >
    > > I have an analoge distance-mesurements-sensor which outputs a
    voltage
    > > signal between 0.4 and 2.6 volt (80-10 cm.)
    > > Is there an easy way to connect this snesor to the bascistamp 2
    and
    > > measure the voltage?
    > >
    > > thanks harco
    > >
    > >
    > >
    > > 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 2004-05-04 10:15
    Dear all,
    Can I use Basic Stamp BS2p to measure battery votlage?
    If yes, any AD/DA is needed for the circuit?
    Thank you!!
  • ArchiverArchiver Posts: 46,084
    edited 2004-05-04 10:16
    At 09:15 AM 5/4/04 +0000, ck1_chu wrote:
    >Dear all,
    >Can I use Basic Stamp BS2p to measure battery votlage?
    >If yes, any AD/DA is needed for the circuit?
    >Thank you!!

    The answers to both your questions are YES and YES.
    An ADC will be required.



    >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.
    >
    >Yahoo! Groups Links
    >
    >
    >
    >
  • ArchiverArchiver Posts: 46,084
    edited 2004-05-05 02:00
    --- In basicstamps@yahoogroups.com, Bruce Bates <bvbates@u...> wrote:
    > At 09:15 AM 5/4/04 +0000, ck1_chu wrote:
    > >Dear all,
    > >Can I use Basic Stamp BS2p to measure battery votlage?
    > >If yes, any AD/DA is needed for the circuit?
    > >Thank you!!
    >
    > The answers to both your questions are YES and YES.
    > An ADC will be required.
    >
    >


    How does it work?? Which command should be used.
    I have no idea for this program.
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