A pedometer based on micro-electro-mechanical system（MEMS） acceleration sensor LIS3DH is designed

including motion detection

data processing and display terminal.The digital output acceleration sensor LIS3DH is used as motion detection module

which detects the acceleration change of human motion;data processing module processes the acceleration signal

FFT filtering and adaptive frequency range are used to remove influence of noise on acceleration signal

using rise and decline region of acceleration change to calculate the number of steps of human walking.The experimental results show that the system has the advantages of small size

simple structure

low power consumption

stable operation

and it can provide high precision step counting function.