I'm searching for information concerning the stabilisation using only gyroscopes and an AVR for a tricopter.
From the different forums read, most implementations are for 5,6 or even 9 Degrees of Freedom (magnetometer readings, alas!) which typically involve an accelerometer and a gyroscope. Kalman filters are proposed to perform a correction estimation for the measured data, taking covariance matrix operations into account.
As I understand, an integration is made over time between consecutive samples to find out the rotation on one of the axes.
My first question is: Using only a 3-axis gyroscope, would it be possible to use a simple filter (i.e.: lowpass) to filter out the noise?
Second question : How would the cutoff Freq be calculated? The copter itself uses motors with 750rpm/Volt @ 3 Volts.
Any input would be much appreciated.