Step-counting has become a basic function of all kinds of wearable electronic equipment

but it ’s difficult to precisely calculate a random step distance.In order to overcome this difficulty

a new type of pedometer system is designed

this system adopts MPU6050 sensor module and CC2541 Bluetooth module in hardware

and put the sensor into the bottom of shoe horizontally. In the aspect of software

an upper personal computer is designed to receive data of foot movement acquired by MPU6050

it also can calculate accelerations and realize coordinate system transform.In addition to the above basic operations

an algorithm for pulse extraction is proposed to distinguish walking state and static state

and to extract acceleration values under the walking state

those acceleration values by theory of integral to calculate length of each step. After testing

the algorithm is able to control measurement error of any distance of step within 3.4 %.