[25cf]

Does anyone have any idea how the phone detects knocks and differentiates it from, say, rolling around in your backpack? I know the LG G2 also has a "knock detection", e.g. the phone turns on when you knock on it twice. I want this feature in one of my apps so I'm just curious about how this is done.

[holyjaw]

I'd assume the accelerometer is able to differentiate between the sharp staccato of a rapping of the knuckles vs. the steady circular motion of rolling.