About FAE_CA1

Hi, If you use BMA + BMM150, then the BMM150 calibration will need to be done on your MCU side which means you need to develop your own algorithm to calibrate BMM150. In addition, your MCU also needs to use ACC data to do tilt compensation on the heading angle. Therefore, to keep it simple it is recommended that you use BHI260AP + BMM150 for your golf distance meter project. BHI260AP is a smart sensor that has built-in 32-bit ultra low power floating point MCU. It also has BSX sensor fusion running inside that can automatically calibrate BMM150 and output tilt compensated dynamic heading angle if you choose 9DoF sensor fusion mode. Thanks. ... View more

Hi, Here is what you can do to verify your code. In your initialization function, you can configure BMI160 as below. Write value of 0x11 to register 0x7E;     // set ACC to normal mode, by default ACC is +/-2g full scale range and 100Hz ODR Delay 5ms;                                                        // the max time of 3.8ms from datasheet Write value of 0x15 to register 0x7E;    // optional, set GYR to normal mode, by default GYR is +/-2000dps full scale range and 100Hz ODR Delay 80ms;                                                     // the max time of 80ms from datasheet unsigned char value = read register 0x03; If (value == 0x14) then it means both ACC and GYR are in normal mode now In your loop function for example you can burst read BMI160 data registers from 0x0C to 0x17 total 12 bytes in one single I2C transaction at 1s time interval. Then you can plot Ax, Ay, Az values on the terminal to see if you can get about 16384 integer when you place any axis pointing to sky and about -16384 integer when any axis is pointing to ground. If yes, then you can change BMI160 ACC full scale range to +/-8g by writing the value of 0x08 to register 0x41 and then repeat the above steps. You should get about 4096 integer when you place any axis pointing to sky and about -4096 integer when any axis is pointing to ground. Thanks.   ... View more

Hi, Thanks for your inquiry. BMI088 doesn't accept external signal to trigger the measurements so that multiple BMI088s can be synchronized. And in theory it not possible to synchronize two IMUs by any means, because each IMU has its own internal clock and signal path. Even if they can be synchronized, the MCU also needs time to read their data one by one which will have delay between two IMUs' measurements. So the possible solution could be increase the BMI088 ODR. For example if your MCU needs to read two IMUs' data at 100Hz, you can configure two IMUs to run at 800Hz ODR (output data rate). Therefore, whenever your MCU reads two IMUs' data they are pretty much close to each other in time which means they are almost synchronized. Thanks. ... View more

Hi, Thanks for your inquiry. Regarding BMM150 magnetometer calibration, you can refer to the hands-on video from Digikey talking about how to calibrate magnetometer hard-iron and soft-iron at https://www.youtube.com/watch?v=cGI8mrIanpk. It can be both offline calibration and automatic calibration. If your device is only rotating on a leveled surface, then BMM150 magnetometer itself can be calibrated and used to measure the magnetic heading with respect to earth magnetic north pole. However, if your device can be tilted up and down, or left and right, then you need ACC to compensate the heading. You can find a lot of articles about how to use ACC to work with magnetometer to behave eCompass. The heading accuracy is good only when your device is stationary. If your device needs to output accurate dynamic heading for 3D fast rotation motion, then you also need gyro to help. This is so called 9-axis sensor fusion. At this time magnetometer can help gyro z axis not to drift away and gyro can help magnetometer be immune to external magnetic interference. There are also a lot of articles for it. Thanks. ... View more

Hi, Thanks for your inquiry. Please see BMI160 datasheet at https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bmi160-ds000.pdf for the definition of Any-motion and Significant motion interrupts. Then you can test these interrupts on Nicla Sense ME board. Thanks. ... View more