MEMS based Human-Machine Interaction System for virtual touring

To obtain a kind of cheap, convenient and user-friendly virtual reality interaction system, the Human-Machine Interaction System based on Micro Electronic Mechanical Sensor (MEMS), LM3S1138 embedded Micro Control Unit (MCU) and Vega modeling software for virtual touring is introduced in this paper. Two MEMS including a magnetic sensor and an accelerate sensor are utilized to calculate the state variable of the joystick. Based on the measurements of two sensors the state variable consists of azimuth and inclination are computed which can uniquely determine the state of joystick in spherical coordinates. The system, firstly, record the initial state of joystick. Then by comparing the variation between initial state and current state, action command changing the viewpoint in the virtual world are generated. Finally, in Vega established virtual world theoretical command boundary and measured command boundary are compared proving the feasibility of this system in practice.