is it possible to detect a tap without using of DMP feature of MPU9250?

[ASHISH]

Hi, i am using nrf51822 interface with mpu9250 and i want to detect a tap without using of DMP feature of mpu motion sensor. my application requirement is low current consumption that's why i want to play with raw readings of mpu and want to detect a tap or double tap. how can i achieve this.does anybody has idea about this? immediate help nedded!! Regards, Ashish

[Sigurd]

Maybe look into what separates the tap and a little shake?

With a tap, you are maybe above the threshold for a small amount of time, but with a little shake, you are above the threshold for a much longer time? So you could maybe use a timer to measure the time you are above the threshold, and if you are above the threshold for a certain amount of time, you know that this is a little shake and not a tap?

Maybe InvenSense also have some ideas on this also.