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MMA8452Q Slow motion detection

Question asked by John Munroe on Sep 27, 2015
Latest reply on Sep 28, 2015 by Tomas Vaverka

Hi

 

I'm hoping to trigger an interrupt when the acceleration is relatively low, e.g., a garage door begins opening, person begins walking. I see that the resolution is 0.063g/LSB, so 0x0F gives 1g - does that mean 0x0F is the minimum threshold for it not to trigger an interrupt when stationary? If so, does that mean it won't be able to pick up slow accelerations (< 9.8m/s^2) on any axis?

 

Since the acceleration could be too slow, could an interrupt be fired on a change in accelerations across all axes, e.g., a 0.05g change on any axis between samples?

 

I'm not so sure about what the debounce samples do, but could those be somehow tweaked in order to cope with slow accelerations?

 

Thanks

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