The mouse is a basic component of the computer. play an important role. With the advancement of technology and market demand. The mouse also experiences rapid development. The traditional mouse should be a wired mouse or a wireless mouse. Suitable applications and scope are limited due to the reason for the control principle, or by the constraints of the cable, or the dependence on the vectors such as the cable. Therefore, there is an urgent need for many applications in the market. The mouse that meets the special functional needs of different people, at this time. 3D wireless mouse concept. This article uses the MEMS acceleration sensor. The touch module and the Lingyang microcomputer completed the description of the principle of mouse 3D control. And the record of the actual operation in the experiment provides a reference basis for the production of multi-function new mouse.
1 3D wireless mouse work principle
The wireless radio frequency mouse is generally divided into transmit modules (see Figure 1) and the receiving module (see Figure 2) two portions. The transmit partial module is integrated in the handheld, controlled by the user. The receiving module is connected to the instrument such as PC, notebook.
Figure 1 Transmission Module System Box Diagram
The transmit module consists primarily consisting of a resistive touch screen, a MEMS acceleration sensor, a 16-bit Lingyang microcontroller, and an NRF2401 transmit module. The touch screen is used to detect the change in coordinates X, Y, through the analysis of the X, Y change trend, and complete the simulation of the mouse movement trajectory. The MEMS acceleration sensor is used to sense the user's actions, defined these motions as special instructions. Establish a special function key for mice. At the same time, the transmitting module and the receiving module complete the wireless communication of the two by 2.4 GHz wireless transmission and receipt. The USIB drive circuit of the receiving end implements the mouse control function of the PC.
When the algorithm is changed by the algorithm processing, it is necessary to filter the coordinates of the error during operation, and simplify the movement direction of the mud. And by curing the matching method, the overall movement trend of the mouse is correctly reflected. Thereby better completion of the analysis of the trend of hand gesture, achieving accurate positioning of the mouse.
2 hardware circuit design of touch screen detection devices and acceleration sensors
In terms of action induction modules. The duck C2046 is used as the four-wire resistive touch screen controller. TSC 2046 is widely used in small handheld devices that are widely used in batteries with its low power and high rates. Its principle circuit connected to the touch screen is shown in Figure 3. on the other hand. The MEMS acceleration sensor module using the model MXR9550. Its small size, light weight, low power consumption, high reliability, easy integration, and intelligence, its principle circuit is shown in Figure 4, using it to sense people's actions, such as waving, swing arm, etc., then Different movements are defined as special functions, such as the PPT, PDF flipping, shut down windows, and switching windows, etc.
Figure 3 Hardware schematic diagram of TSC2046 and touch screen connection
Figure 4 MEMS acceleration sensor principle circuit
3 system flow design
At the transmit terminal. When the system is powered on, the control chip will always detect the status of the touch screen and the MEMS acceleration sensor. When you slide the touch screen or shake the mouse, the system will receive the data while the Lingyang microcontroller is processed by these data. It is possible to determine whether the trajectory of the finger moves on the touch screen and whether the mouse is shaken. These actions are then defined as different instructions. The wireless module is emitted out. The program process is shown in Figure 5.
Figure 5 Flowchart of hand-held
At the receiving end, the wireless module is always waiting to capture the transmit signal. After the reception is successful. The control chip is transmitted to the computer via the USB interface circuit based on the different instructions received. Complete the mouse action. Thereby achieving the entire process of wireless mouse operation. The program process is shown in Figure 6.
Figure 6 Receive end program flow chart
4 mouse hand gesture algorithm design
Since there are many data acquisitions, a small portion of the data has an error, and if these error data is not filtered, it will definitely affect the mouse movement track. How to get accurate touch screen data. It is the key to optimizing the mouse movement trajectory. Therefore, in the program design. A algorithm for optimizing the mouse movement trajectory is proposed. The rough ideas are as follows: 1 Filter mouse movement. As shown in Figure 7 (a). This step is removed by the small range fluctuations in a series of mobile movements, this step is necessary; 2 limits the direction of movement of the mouse, as shown in Figure 7 (b). For simple mouse gestures, only 4 directions are supported up and down. End the movements in other directions into these 4 directions. Generally, the difference between the upper and lower directions and the left and right directions is generally, and the one is taken as the last direction; 3 simplify the moving direction sequence, as shown in Fig. 7 (c). This step is very simple. It was originally the direction sequence on the upper right upper right, simplified into the upper right upper right; (Multi-match action sequence, as shown in Figure 7 (d). This step is the most difficult, the surface is put it The short distance movement in the long distance movement is filtered. The actual approach is to match the entire action sequence with a set of predefined action sequences. If the match fails, the shortest movement in this sequence is filtered out, and then Match, so looped until it matches.
Figure 7 Gesture Algorithm Demonstration
5 Conclusion
This paper describes a new idea of 3D wireless radio frequency mouse, which has not only realized the innovation of the traditional mouse not only, but also makes the mouse to truly get rid of the dependence of the cable and the carrier. With the development of Internet applications, the idea of mobile office has been more and more support, so the wireless mouse designed in this paper can also follow the trend of mobile office.
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Reprinted from -Wiku Electronic Market Network
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