Reading sensor data off a ICM-20948 via i2c with Arduino uno

So I have a project where I have to read Sparkfun's ICM-20948's data (Gyro, accelerometer, and magnetometer) through matlab, and down the line, I need to perform calculations with those numbers. Im not too familiar with matlab, but the sensor does work with arduino IDE. I have the sensor hooked up via I2C pins. This is my code so far:

a = arduino("COM4","Uno","Libraries","I2C")
s.BaudRate = 115200;
fs = 100;
IMU = device(a,'I2CAddress','0x69');
write(IMU, 0x0, 'uint8');
data = read(IMU, 4, 'uint16')

the output from data was [234, 0, 16384, 65]. Im not sure what these numbers mean. The ICM-20948 was suppose to be a "upgrade" to the mpu9250 according to adafruit's website, but the mpu() command that matlab has does not work with this sensor. My uno is also from sparkfun. The pinout diagram provided by arduino explorer app seems to have SDL and SDH flipped, so im not sure if that would cause any problems? Any ideas on what I should do?

Answer 1

[Gayatri Menon]

Hi,

Even though ICM20948 is the recommended sensor over MPU9250, the register settings for both the sensors are different. Hence using mpu9250() wouldn't work since this functionality is implemented considering MPU9250 registers.

ICM20948 sensor is supported in MATLAB & Simulink from R2022a.

a = arduino
imu = icm20948(a)
imu.read
imu.readAcceleration

See below links for more info

ICM20948 MATLAB

ICM20948 Simulink

Hope this helps

Thanks

Gayatri

[Matthew Kirchner]

I have this chip and use the simulink suport package to read IMU data. Accelerometer and Mag reads correctly, but there appears to be an error in reading the gyro data. It just outputs a bunch of noise. I have purchased from 2 different manufacturers that both implement with the ICM20948 chip and they both produce the same error. It also is present for different platforms: I run in with a Raspberry Pi and also Arduino. Both produce the same gyro read problem.

[Belal]

I'm experiencing the same thing.

Apparently, this library has a problem with the gyro reading.