Measuring angle relative to the floor

[Ether]

Originally Posted by GuyM142

do you have some information about filters which I can start with?

Here's a very simple low-pass IIR filter:

filtered_value = a*filtered_value + (1-a)*new_value

"new_value" is the new reading from the accelerometer.

"filtered_value" is the filtered version of the accelerometer reading.

"a" is a tuning constant which tunes the strength of the filter. "a" has a range of 0 to 1.

When a=0, there's no filtering -- the filtered_value always equals the accelerometer reading.

As "a" approaches 1, the filtering gets more aggressive -- the filtered_value has less noise (but more phase lag).