Abstract
A method of measuring inclination based on MEMS accelerometer is introduced,and a digital inclination sensor is developed. This paper describes the hardware structure of sensor and working principle. MEMS-based accelerometer senses axial component of gravity in sensitivity-axis direction. MSP430 microcontroller does temperature self-compensation in the light of the temperature drift fitting curve while the thermometer monitors environment temperature. IIR filtering algorithm is adopt to eliminate disturbance from high-frequency vibration noises. In order to analyze characteristics in frequency domain, Butterworth filter is simulated and filtering coefficients are given by MATLAB. The sensor is calibrated to eliminate angle drifts by RS232 interface. The result shows that the measuring accuracy of inclination sensor is up to 0.002°.
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