A Design Of Drawing Gesture Trajectories System Based On MEMS

With the development of science and technology,people has paid more attention into the technology of human-computer interaction.There are some problems of traditional humancomputer interaction such as touch screen,speech recognition resulting in the inconvenience in some situation.However,the research of space location and trajectory tracking technology has made up the shortage of human-computer interaction and play an important role to help develop it.This paper associates with the existing technology to design and develop an intelligent handwriting device in contactless.The main work in this thesis are as follows:1.The design of hardware system.According to analysis the working feature and the cost of this system,this paper design a hardware system based on Micro Electro Mechanical System(MEMS)inertial sensing device by myself and then introduces the selection of data acquisition module,data commuciation module,power module and main control module in dail.2.The application of handwritten device algorithm.The algorithm of the whole system is divided into two parts: the first part is the attitude calculation algorithm which needs to be completed in the microcomputer(MCU)and the second part is to complete the trajectory reconstruction algorithm at the mobile terminal or the computer.The current attitude calculation algorithm mainly includes extended Kalman filter algorithm and complementary filtering algorithm.Considering the complexity of the algorithm and combining the performance and demand of the system itself,the complementary filtering algorithm is selected as the attitude calculation algorithm.This paper introduces the principle and process of the algorithm in detail.After that,this paper combines the hardware system with the acceleration double integral method to get the gesture motion trajectory3.The design and implementation of mobile display terminal.Considering that the current Android mobile users account for about 86% in the total mobile phone market,this paper design and develops an application based on Android operating system which can display the collected data and the attitude in real time.The experimental test results show that the contactless intelligent handwriting device designed in this paper can achieve collecting nine axis raw data and complete the attitude calculation in real time.Then the raw data and the attitude can be displayed on a mobile phone terminal,and can clearly reflect the shape and size of the hand trajectory.This design provide a lot of convenience for our life.