Question

I m having some problems with the accelerometer. When I first started develop my game the controls felt very snappy and precise, but when adding more graphical elements the accelerometer feels like it s reacting very late and sometimes not as precise as before. I m having a framerate of around 40fps.

This is where I read the values (as i m supposed to I guess)

- (void)accelerometer:(UIAccelerometer*)accelerometer didAccelerate:(UIAcceleration*)acceleration;

Is this a common and expected behaviour or can I do something about it? Can the sample rate and precision be controlled? Or have done something wrong if this happens?

Answer 1

If your game felt responsive before and now it doesn t, then chances are that the accelerometer update rate isn t the issue. How are you propagating the accelerometer events up into the game loop? If your orientation updates are coming in at a rate faster than the main loop is consuming them, that can feel like additional latency.

Answer 2

Yes, the sample rate can be freely adjusted:

//sample rate 100hz
#define kAccelerometerFrequency 100.0f

//setup sampling rate
[[UIAccelerometer sharedAccelerometer] setUpdateInterval:(1.0 / kAccelerometerFrequency)];

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