About hedazhuang

I think it  could be the resonating. But at this moment I don't have anything more sensitive than IMU to use for checking the vibration frequency. From the accelerator reading the vibration is 50Hz captured. What range of frequency may cause resonating in gyro sensor? ... View more

Thank you for your reply. If it is put on the table still, the reading is good with no abnormal readings.  The test we did is to fix the IMU on the shelf at the same spot, while the shelf also connect to a motor which rotates in the specific pattern. It will generate some vibration to shelf and transferred to the IMU for sure. But the question is, why different IMU has the different performance, which I didn't expect. ... View more

Thank you for your reply. 1. My apology for unclear description. X-axis in the plot is the time and actually is not vibration but spike readings. We did a periodic movement. The vibration I mentioned is the peak value on the gyro reading, which is shown in the blue waveform (gyro rate_x reading), green (gyro rate_z reading) and red (gyro rate_y reading). We have a bunch of PCBs, but two of them have this kind of high peak values on the x reading of gyro. I update the comparison of the normal reading with the huge spike reading in the following two graph. Both are running the same movement for our testing. Graph one (left) is the normal reading, graph two (right) is the spike reading. x-axis is time. The sampling rate is 2kHz.                                              graph 1                                                                                                        graph 2 2. the settings of the gyro is as follows                                                                                                 reg addr                    data BMX055_GYRO_BGW_SOFTRESET                  0x14                       0xb6 BMX055_GYRO_RANGE                                         0x0f                         0x00   GFS_2000DPS BMX055_GYRO_BW                                                 0x10                        0x04   G_200Hz23Hz I also reset the offset by register 0x21. ... View more