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Memsic 2125 help needed — Parallax Forums

Memsic 2125 help needed

ArchiverArchiver Posts: 46,084
edited 2004-02-26 22:40 in General Discussion
I want to use the Memsic 2125 as a rotational sensor for my robot. I
want to use it instead of a compass to decide how many degrees my
robot turns.

The problem is that no matter how i posistion the Memsic i can't get
it to sens rotation in the horizontal plane. Measuring rotation in
the vertical plane (like a clock on the wall) works fine.

Is it impossible to use it in the way i want or do i just have to
position it differently?

My robot is currently very disorientated!

Magnus
Stockholm, Sweden

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2004-02-16 14:12
    You wont be able to use the Memsic in that application -- unless your
    robot is a wall-climber. The reason is that it relies on gravity. If
    you tilt the sensor up on its side, you can combine the X and Y outputs
    to get rotational position, but in the vertical plane, not horizontal as
    a normal robot would require.

    We don't sell them, but you might consider the CMPS01 from
    Devantech(www.robot-electronics.com). I've used it with BASIC and
    Javelin Stamps and it works quite nicely.

    -- Jon Williams
    -- Applications Engineer, Parallax
    -- Dallas Office

    Original Message
    From: skogsvargen [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=-sOa5GoFaeARCiPy7P9pXL4pUO5k2ZlD3QpPsruKfigiMEtPIIc0EHoqDYRiliEgs6WMHyrBHCjkXbikKw]skogsvargen@y...[/url
    Sent: Monday, February 16, 2004 1:54 AM
    To: basicstamps@yahoogroups.com
    Subject: [noparse][[/noparse]basicstamps] Memsic 2125 help needed


    I want to use the Memsic 2125 as a rotational sensor for my robot. I
    want to use it instead of a compass to decide how many degrees my
    robot turns.

    The problem is that no matter how i posistion the Memsic i can't get
    it to sens rotation in the horizontal plane. Measuring rotation in
    the vertical plane (like a clock on the wall) works fine.

    Is it impossible to use it in the way i want or do i just have to
    position it differently?

    My robot is currently very disorientated!

    Magnus
    Stockholm, Sweden
  • ArchiverArchiver Posts: 46,084
    edited 2004-02-22 19:27
    Thanks,
    After turning the device in all possible direction i started to
    think instead... And off course you are right. I have allready
    ordered the CMPS03!

    /Magnus

    --- In basicstamps@yahoogroups.com, "Jon Williams" <jwilliams@p...>
    wrote:
    > You wont be able to use the Memsic in that application -- unless
    your
    > robot is a wall-climber. The reason is that it relies on
    gravity. If
    > you tilt the sensor up on its side, you can combine the X and Y
    outputs
    > to get rotational position, but in the vertical plane, not
    horizontal as
    > a normal robot would require.
    >
    > We don't sell them, but you might consider the CMPS01 from
    > Devantech(www.robot-electronics.com). I've used it with BASIC and
    > Javelin Stamps and it works quite nicely.
    >
    > -- Jon Williams
    > -- Applications Engineer, Parallax
    > -- Dallas Office
    >
    >
    >
    Original Message
    > From: skogsvargen [noparse][[/noparse]mailto:skogsvargen@y...]
    > Sent: Monday, February 16, 2004 1:54 AM
    > To: basicstamps@yahoogroups.com
    > Subject: [noparse][[/noparse]basicstamps] Memsic 2125 help needed
    >
    >
    > I want to use the Memsic 2125 as a rotational sensor for my robot.
    I
    > want to use it instead of a compass to decide how many degrees my
    > robot turns.
    >
    > The problem is that no matter how i posistion the Memsic i can't
    get
    > it to sens rotation in the horizontal plane. Measuring rotation in
    > the vertical plane (like a clock on the wall) works fine.
    >
    > Is it impossible to use it in the way i want or do i just have to
    > position it differently?
    >
    > My robot is currently very disorientated!
    >
    > Magnus
    > Stockholm, Sweden
  • ArchiverArchiver Posts: 46,084
    edited 2004-02-22 20:24
    Can anybody suggest a compass module that would be suitable for use on a boat
    (pitching & rolling issues)?

    Respectfully,
    Jay K. Jeffries
    Original Message
    From: skogsvargen [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=9fr2OfznE8tz93NJLRsGQnbhjM4UMLgQNWs_RL0kOK2QbtEBareLVoCUCeNjqpbXH_e6qUZ7Y0pBiiZu]skogsvargen@y...[/url
    Sent: Sunday, February 22, 2004 2:28 PM
    To: basicstamps@yahoogroups.com
    Subject: [noparse][[/noparse]basicstamps] Re: Memsic 2125 help needed

    Thanks,
    After turning the device in all possible direction i started to
    think instead... And off course you are right. I have allready
    ordered the CMPS03!

    /Magnus
  • ArchiverArchiver Posts: 46,084
    edited 2004-02-26 22:40
    I can't give you any suggestion, but it migth be possible to use a
    memsic2125 to calculate the roll and and pitch changes and then
    correct the compass data with the help of theese values. Just an
    idea...

    /Magnus


    --- In basicstamps@yahoogroups.com, Jeffries Jay K AIBS
    <bottomgun@m...> wrote:
    > Can anybody suggest a compass module that would be suitable for
    use on a boat (pitching & rolling issues)?
    >
    > Respectfully,
    > Jay K. Jeffries
    >
    >
    Original Message
    > From: skogsvargen [noparse][[/noparse]mailto:skogsvargen@y...]
    > Sent: Sunday, February 22, 2004 2:28 PM
    > To: basicstamps@yahoogroups.com
    > Subject: [noparse][[/noparse]basicstamps] Re: Memsic 2125 help needed
    >
    > Thanks,
    > After turning the device in all possible direction i started to
    > think instead... And off course you are right. I have allready
    > ordered the CMPS03!
    >
    > /Magnus
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