Puck.js gyro/accel and mag orientation.

[espruino-discuss]

Posted at 2023-08-24 by adasim

Hi everyone. I just wanted to check if there is a diagram showing the axis alignment for the gyro/accel and magnetometer. The documentation seems to give an answer for the magnetometer, but isn't specific as to the positive and negative directionality, and I can't find it for the gyro and accelerometer.

The reason that I ask is because, I seem to have to do some odd flipping when using this library:

https://github.com/psiphi75/ahrs

In order to not have the mag readings fight with the faster accelerometer and gyro readings.

[gfwilliams]

Posted at 2023-08-29 by @gfwilliams

I'm afraid there isn't any diagram available at the moment, but it's usually pretty easy to see by dumping the output as you turn the Bangle.

For accel/gyro:

• X -> towards aerial
• Y -> towards IR leds
• Z -> into the PCB towards the battery

For magnetometer it's flipped which is a bit confusing:

• X -> towards IR leds
• Y -> towards aerial
• Z -> into the PCB towards the battery