To meet the need of dynamic angle measurement of finger joint

a method for finger motion gesture detecting is designed based on MEMS accelerometer.In this method

the joint angle is determined by the component of the gravity acceleration sensed by the sensitive axes of accelerometers.To verify the feasibility of the proposed scheme

a rotating device which can be controlled by the stepper motor is designed in vertical plane

and the measurement precision of the sensor in dynamic conditions is evaluated by detecting the sensor output and the motor rotation angle synchronously.The results show that the absolute error and relative error mainly range of 1°～2.5° and 3 %～6 % respectively in the dynamic testing.On the basis of this

the accelerometer is used to detect the motion gesture of finger joint when the finger is tapping keyboard

and acquire the angle variation with time of the index finger’s MCP joint

PIP joint and DIP joint by processing datas collected by the sensor.The preliminary results indicate that accelerometer-based finger motion detection is an effective method.