X axis never change

[srchang2023]

Hi there,

First of all i would like to thank you for you work, it's simply quite amazing, second i tried to use the gait tracking script, but when use the FusionAhrsGetEarthAcceleration(&ahrs); the x axis never change, indeed the z axis neither, but any way as an example here's what i'm getting as output,

First read:
earth.axis ={
x float 1494086.62
y float 1.10672033e-007
z float -0.99994278
}

Now moving;
earth.axis ={
x float 1494086.62
y float 4.33112182e-005
z float -0.999985158
}

As stated before, the same value for Z and X axis, so yes, the IMU is located at my foot, yes i made soft and hard movements, yes the Euler angles works, yes the library used is the last version of fusion, btw;

The MCU used is a STM32, i guess it doesn't matter, but what could be important is the IMU, is a lsm6dso from st, the settings are:

• acelerometer = 2g @ 1667Hz
• gyroscope = 2000 dps @ 6667Hz
• Sample rate = 2

I'm not using the magnetometer, but as far as i can tell it is not used by the function.
So any light on this issue would be very appreciated,

[xioTechnologies]

There are several problems with the information you have shared.

1. An acceleration value of 1,494,086.62 g is clearly incorrect, especially given your sensor range is 2 g.
2. An accelerometer range of 2 g is too low for motion of a foot, I suggest you use the maximum range of your device.
3. A sample rate of 2 Hz is too low for any practical application. I suggest you use at least 100 Hz, ideally higher.

[srchang2023]

Thank you so much for you time, and for helping me of course,
Made the changes suggested and the output is still the same, i suspect there's something wrong with the sensor settings parameters,
The calibration method for the acelerometer was put the sensor on a flat surface to measure the raw value, i took for 1g a raw value of 16384 according to the internet, so then i sum or subtract the offset and put'em inside the FusionVector accelerometerOffset array, and the same for the gyroscope, according to this site all i had to do is leave stan still the sensor and add the values to the gyroscopeOffset array, so in theory the sensor is calibrated, but as you say, "An acceleration value of 1,494,086.62 g is clearly incorrect, especially given your sensor range is 2 g." then i'm missing something but i can not find out what is, so again any help would be very handy.

[xioTechnologies]

I am sorry but I am unable to help. I suggest you search for online tutorials and guides for how to read measurements from the sensors.

[srchang2023]

I'm gonna start from it, what's weird is that Euler angles works, but anyways, thanks so much for you help, maybe i'll be back with more doubts later,
Regards!