Hi, I am a student from China and I am currently using the bmx160 to get a three-axis Angle for my personal diy robot.I'm using stm32 control.Since I could not find the official API and had no password, I wrote the driver code by referring to the data manual.During this period, I have met some questions, which I hope can be answered by the Bosch.First, I do a self-test of the accelerometer.The following two graphs are the data I obtained.
What confused me was that the Y-axis data didn't seem to be quite right and had reached saturation (the acceleration self-test was written strictly according to the Datasheet, 8G range), and the minimum differential signal on the X-axis didn't seem to reach 2G.I suspect it's a chip problem, and I'd like some answers.Thanks.😀
The amplitude of the deflection sets low:
Z-axis facing up
X-axis facing up
Y-axis facing up
X
Y
Z
X
Y
Z
X
Y
Z
一
0.6145
1.6519
1.6687
1.6787
1.7437
0.6052
0.6147
2.6621
0.6050
-0.3433
-1.4688
0.7229
0.6147
-1.4697
-0.3401
-0.3435
-0.4592
-0.3401
二
0.6150
1.6523
1.5505
1.6792
1.7439
0.6045
0.6143
2.6614
0.6047
-0.3428
-1.4690
0.7236
0.6152
-1.4692
-0.3403
-0.3433
-0.4595
-0.3398
三
0.6147
1.6516
1.5503
1.6790
1.7437
0.6047
0.6145
2.6616
0.6057
-0.3433
-1.4692
0.7236
0.6147
-1.4692
-0.3401
-0.3425
-0.4595
-0.2217
The amplitude of the deflection sets high:
Z-axis facing up
X-axis facing up
Y-axis facing up
X
Y
Z
X
Y
Z
X
Y
Z
一
2.4246
7.8025
2.8501
3.3821
7.9856
1.6685
2.3184
7.9998
1.7861
-2.0469
-7.4360
-0.4580
-1.0884
-7.3447
-1.6404
-1.7861
-6.3345
-1.5222
二
2.4243
7.8945
2.8501
3.3828
7.8938
1.7869
2.3179
7.9998
1.7861
-2.0461
-7.5276
-0.4585
-0.9824
-7.3438
-1.5217
-2.1528
-6.3342
-1.5212
三
2.4243
7.8023
2.8501
3.3821
7.8943
1.7864
2.3176
7.9998
1.7866
-2.0464
-7.4360
-0.4583
-0.9819
-7.3442
-1.5220
-2.1528
-6.3340
-1.5222
Also, my magnetometer data kept coming in at 0, and I was confused.
BMX160_SPI_Write(BMX160_MAGN_IF_0_ADDR, 0x80);
HAL_Delay(50);
// Sleep mode
BMX160_SPI_Write(BMX160_MAGN_IF_3_ADDR, 0x01);
BMX160_SPI_Write(BMX160_MAGN_IF_2_ADDR, 0x4B);
// REPXY regular preset
BMX160_SPI_Write(BMX160_MAGN_IF_3_ADDR, 0x04);
BMX160_SPI_Write(BMX160_MAGN_IF_2_ADDR, 0x51);
// REPZ regular preset
BMX160_SPI_Write(BMX160_MAGN_IF_3_ADDR, 0x0E);
BMX160_SPI_Write(BMX160_MAGN_IF_2_ADDR, 0x52);
//Prepare MAG_IF[1-3] for mag_if data mode
BMX160_SPI_Write(BMX160_MAGN_IF_3_ADDR, 0x02);
BMX160_SPI_Write(BMX160_MAGN_IF_2_ADDR, 0x4C);
BMX160_SPI_Write(BMX160_MAGN_IF_1_ADDR, 0x42);
BMX160_SPI_Write(BMX160_MAGN_CONFIG_ADDR, 0x08); //100HZ
BMX160_SPI_Write(BMX160_MAGN_IF_0_ADDR, 0x02);
HAL_Delay(50);Hope to hear from you as soon as possible. Thanks again.