How to implement a LowPass Filter?

Question

I\'m doing some math on both gyroscope and accelerometer data combined and I\'d like to low pass filter the resulting data. So could someone post some generic code for a Low Pas

Answer 1

A 1st order IIR low-pass filter can be of the form:

output_value = rate * input_value + (1.0 - rate) * previous_output_value;

which is pretty much what's inside Apple's AccelerometerGraph example. You select the rate parameter depending on what frequency (very very roughly shakes per second) you want to roll-off or start to attenuate to get a smoother resulting output, and the sample rate of the input data.