MetamotionR Signal Processing

in Python, I cannot process the data I have received from the sensor(MetamotionR). With parse_value(data) I can show it but not processing. Is there any suggestion?

Comments

    • Post the code you are currently working with
    • Describe what is wrong with it; post output logs
    • Describe the expected behavior
  • edited March 14

    modify of acc_stream code[examples]

    def __init__(self, device):
        self.device = device
        self.samples = 0
        self.callback = FnVoid_VoidP_DataP(self.data_handler)
    
    def data_handler(self, csv, data):
    
        datax=parse_value(data).x
        datay=parse_value(data).y
        dataz=parse_value(data).z
    

    In here, my aim take the rotation data on the gyroscope sensor. for this, I try to get the data in the above code but it doesnt directly involve rotation information, just to change in rotation. Is there a any code that is directly rotation data?

  • This is in our matlab tutorial but it is in python (this examples stream quaternion data into matlab): https://github.com/mbientlab/MetaWear-Tutorial-Matlab/blob/master/echo_quat_server.py

  • def data_handler(self, csv, data):
    datax=parse_value(data).x
    datay=parse_value(data).y
    dataz=parse_value(data).z

    I have noticed that the data I have received does not include x, y, and z angle information. Is there any suggestion i?

  • edited March 15

    Laura ? Eric? :(

  • edited March 15

    *

  • edited March 15

    gyro_stream code

    states = []
    d = MetaWear('XXXXXX')
    d.connect()
    print("Connected to " + d.address)
    states.append(State(d))

    for s in states:
    print("Configuring device")
    libmetawear.mbl_mw_settings_set_connection_parameters(s.device.board, 7.5, 7.5, 0, 6000)
    sleep(1.0)

    #libmetawear.mbl_mw_gyro_bmi160_set_odr(s.device.board, 100.0)
    libmetawear.mbl_mw_gyro_bmi160_set_odr(s.device.board, GyroBmi160Odr._50Hz)
    libmetawear.mbl_mw_gyro_bmi160_set_range(s.device.board, GyroBmi160Range._250dps)
    libmetawear.mbl_mw_gyro_bmi160_write_config(s.device.board)

    #print(s.device)
    signal = libmetawear.mbl_mw_gyro_bmi160_get_rotation_data_signal(s.device.board)
    #signal=libmetawear.mbl_mw_sensor_fusion_get_data_signal(s.device.board)
    libmetawear.mbl_mw_datasignal_subscribe(signal, None, s.callback)
    #print(signal)
    libmetawear.mbl_mw_gyro_bmi160_enable_rotation_sampling(s.device.board)
    libmetawear.mbl_mw_gyro_bmi160_start(s.device.board)

    sleep(10.0)
    for s in states:
    libmetawear.mbl_mw_gyro_bmi160_stop(s.device.board)
    libmetawear.mbl_mw_gyro_bmi160_disable_rotation_sampling(s.device.board)

    result: change:x axis 90 degrees

    {x : 0.320, y : 0.328, z : -0.480}
    {x : 0.373, y : 0.229, z : -0.488}
    {x : 0.373, y : 0.305, z : -0.526}
    {x : 0.305, y : 0.328, z : -0.526}
    {x : 0.328, y : 0.335, z : -0.595}
    {x : 0.320, y : 0.282, z : -0.549}
    {x : -0.831, y : -0.015, z : -7.79}
    {x : -6.364, y : -2.439, z : -83.7}
    {x : 5.800, y : -1.456, z : -103.2}
    {x : 1.082, y : -1.662, z : -76.50}
    {x : -6.928, y : 10.305, z : -17.9}

    when I run the code,I cannot see any reasonable change on the result. I cannot understand what is the wrong

    .

  • M_data=parse_value(data,n_elem = 2)
    in here, I cannot understand n_elem=1 or 2.

  • edited March 15
    1. Wrap your code blocks with ```. What you posted is unreadable.
    2. Explain what is wrong with your code. What is the expected behavior? What is the actual behavior?
  • edited March 15

    *expected behavior:When I rotate the sensor 90 degrees in any axis, I want to see see this angle on the data I received from the sensor.
    *actual behavior:When I rotate the sensor any axis, I cannot see proper value on the data.
    *I think this code doesn't get the proper data through the sensor. I hope I can describe the problem properly.

  • edited March 16

    I'll say it once again, wrap your code blocks with ```.

    Use sensor fusion. Read the links Laura and I provided in our previous posts.

  • edited March 18

    You are streaming gyro data which is angular velocity and not an angle in degrees. If you want vectors, use sensor fusion.

  • I used Sensor Fusion, but I have a problem. When I first ran the code, this code calculated the value correctly. Now, the code is running but cannot calculate the values. Is there any suggestion in this problem?

  • @Bacaksiz_1907 said:
    I used Sensor Fusion, but I have a problem. When I first ran the code, this code calculated the value correctly. Now, the code is running but cannot calculate the values. Is there any suggestion in this problem?

    Repeating myself again....

    @Eric said:

    • Post the code you are currently working with
    • Describe what is wrong with it; post output logs
    • Describe the expected behavior
Sign In or Register to comment.