Question for the value of accelerometer on Puck.js

Hi All,

According to the description on page 18/115 of the "LSM6DS3TR-C.pdf", the x, y, z axis is following the principle of right-hand rule.
However, I just used

Puck.accel()

to get the corresponding acceleration values along the x,y,z axis to test 6 static poses of puck.js, i.e., +x, -x, +y, -y, +z, -z axis along with gravity direction. I got the coordinate system illustrated in the attached figure. This is not followed the right-hand rule. Is there something I missed?

1 Attachment

You're right, that does seem strange. I'm seeing what you describe as well, and it does seem at odds with the datasheet. However I just looked and there's no inversion done in Espruino - those numbers are as they come from the sensor

Hi Gordon,

Currently, I use negative value of z component for adjusting this problem. Might the problem be fixed in the firmware for the future release?

Best regards

The issue is that fixing it would mean breaking other people's code that relies on it now, so probably not.

I'm looking at adding a universal API so I could fix it when I move over to that. However I'm still concerned that the data is exactly as comes off the accelerometer, which is contrary to what the datasheet says - unless somehow it has got configured to flip one axis.

Hi Gordon,

Thank you for your reply. I think that I will go through with the method I mentioned. And keep looking forward to your solutions. Thanks again :)