xbee position and motion

Dear friend,

Hi have a question for you...

Be it will possible to use accelerometers for motion analysis?

Its possible with accelerometer, i want a three exact coordinates (x, y,z) with motion..

Is is possible?
Without using the magnetometer and gyroscope..

Best Regards,

Its possible with accelerometer, i want a three exact coordinates (x, y,z) with motion..

Is is possible?

Depends on what you do with the rate-of-change-of-velocity information you get, and how often (and consistently) you get it, and what your acceptable margin of error is.

This, of course, has nothing to do with XBees.

doxy:
Dear friend,

Hi have a question for you...

Be it will possible to use accelerometers for motion analysis?

Its possible with accelerometer, i want a three exact coordinates (x, y,z) with motion..

Is is possible?
Without using the magnetometer and gyroscope..

Best Regards,

In general, no, impossible.

In certain specific circumstances yes. You need to ensure there is
no rotation of the accelerometer. You need to work with short timescales
only. You need a way to correct for drift regularly (for instance you know
at certain point in time the accelerometer is stationary).

To get position from acceleration involves:

  1. subtracting the gravity vector (9.8m/s^2 upwards)
  2. integrating twice - this is why drift becomes such an
    issue, two integration steps causes accelerating drift away from
    the true value, so in practice you are limited to short timescales.

If you have any rotations you also need a 3-axis gyro and 3-axis accelerometer
to do full DCM or quarternion IMU calculations - so that you know the
orientation before subtracting gravity. Otherwise all results are utterly
bogus.

So what application are you thinking of?

(BTW expensive accelerometers are literally millions of times better than MEMS chips)