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jdjones

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jdjones
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  • (For anyone from the future reading this, the script has been updated.)
    in Log download handler Comment by jdjones November 2016
  • Thanks! I came to the same conclusion (and fixed the script) last night but haven't updated the repo yet. J.
    in Log download handler Comment by jdjones November 2016
  • All inertial measurement units (to my knowledge) measure quantities in the reference frame of the sensor body. This means if the orientation of the sensor changes over time, so will the reference frame in which it records acceleration readings. I'…
    in Track the velocity(or average velocity) of a basketball being dribbled Comment by jdjones November 2016
  • OK, I have a new question. I'm trying to log accelerometer and gyroscope data. When I download, I get the following error: Traceback (most recent call last):   File "_ctypes/callbacks.c", line 314, in 'calling callback function' TypeError: on_no…
    in Log download handler Comment by jdjones November 2016
  • Thanks! That resolved problem 1. I resolved problem 2 by waiting a little between calling teardown and disconnecting from the backend. J.
    in Log download handler Comment by jdjones November 2016
  • Thanks Eric. That's definitely what's happening. I looked into it a little more and figured out most of what's going on. I still have two issues though: 1. No matter what sample rate I set on the device, the accelerometer always samples at 6.25 Hz…
    in Log download handler Comment by jdjones November 2016
  • Hi all (especially @hbldh), I found the bug that was causing this error. Part of the __init__ file in the pymetawear root directory is out of date with the current metawear API. Specifically it's this section about 64-bit python compatibility: …
    in Python client using C++ API Comment by jdjones October 2016
  • functions.py defines mbl_mw_datasignal_log in agreement with the API: libmetawear.mbl_mw_datasignal_log.restype= None libmetawear.mbl_mw_datasignal_log.argtypes= [c_void_p, Fn_VoidPtr]
    in Python client using C++ API Comment by jdjones October 2016
  • Still working on logging data. When the mbientlab python unit tests for logging call mbl_mw_datasignal_log, the second argument (logger_ready) is of type Fn_VoidPtr. I noticed that I get a ctype error if I pass an argument of type Fn_VoidPtr, and th…
    in Python client using C++ API Comment by jdjones October 2016
  • I've been trying to figure out how the example script log_acc.py works, and I'm confused by line 76: libmetawear.mbl_mw_datasignal_log(c.accelerometer.data_signal, cartesian_float_data, logger_ready) The way this function is called above doesn…
    in Python client using C++ API Comment by jdjones September 2016
  • From what I've seen, estimating object orientation with respect to the world frame (e.g. in the form of quaternions or Euler angles) is the first step in 3D tracking. After this, people typically use the estimated orientation to convert accelerati…
    in Is it feasible to create a 3d space absolute tracking using the Meta Wear CPRO ? Comment by jdjones September 2016