ATOM Matrix - IMU values all over the place

greenleaf

I wrote a small program to print out the IMU X, Y, and Z accel values to the serial port.

It seems the readings can be pretty erratic, jumping from near zero to 0.4 or 0.5 even when the device is completely still.

How do you all deal with this? I tried taking the average of the last 5 readings which seems to help a little but it's still kind of jumpy.

Have a look. This is sitting completely flat on the desk:

X: -0.021 Y: -0.011 Z: -0.987
X: 0.421 Y: -0.014 Z: -0.986
X: 0.421 Y: -0.014 Z: -0.987
X: -0.018 Y: -0.016 Z: -0.986
X: -0.022 Y: -0.014 Z: -0.986
X: 0.423 Y: -0.013 Z: -0.987
X: 0.42 Y: -0.015 Z: -0.987
X: 0.417 Y: -0.013 Z: -0.988
X: 0.419 Y: -0.012 Z: -0.984
X: -0.015 Y: -0.011 Z: -0.984
X: -0.02 Y: -0.013 Z: -0.987
X: -0.017 Y: -0.014 Z: -0.987
X: 0.423 Y: -0.014 Z: -0.988
X: -0.019 Y: -0.012 Z: -0.986
X: -0.027 Y: -0.013 Z: -0.988
X: 0.421 Y: -0.013 Z: -0.99
X: 0.423 Y: -0.017 Z: -0.988
X: 0.421 Y: -0.016 Z: -0.988
X: 0.423 Y: -0.011 Z: -0.987
X: 0.42 Y: -0.008 Z: -0.987
X: -0.021 Y: -0.013 Z: -0.986
X: -0.018 Y: -0.014 Z: -0.99
X: -0.022 Y: -0.011 Z: -0.99
X: 0.42 Y: -0.013 Z: -0.984
X: 0.423 Y: -0.012 Z: -0.988
X: -0.023 Y: -0.014 Z: -0.984
X: 0.421 Y: -0.016 Z: -0.985
X: 0.417 Y: -0.015 Z: -0.985

macsbug

Hello @greenleaf

An example using a kalman filter.

https://homemadegarbage.com/reactionwheel03

https://elchika.com/article/52f804c0-e205-4185-8da4-a32f5e3700ba/

greenleaf

Wow, your balancing star is impressive!

I'm just playing around in UIFlow to see what's possible with this device.