Design Of Wireless Hand-held Controller Based On 2.4g Technology

The multimedia classroom, because of its convenient, efficient and the other advantages , has been widely used in many schools and businesses, and is playing an increasingly important role in the teaching activities.The computer is the core of multimedia classrooms,teachers can use mouse to complete controlling PPT, playing video and audio and other operations.Currently, wired mouse is used to control computer in most multimedia classrooms. Therefore, teachers must be in front of PC when operating. This greatly limits the space for teachers and brings a great deal of inconvenience. Wireless microphone is an indispensable equipment in multimedia classroom. Most wireless microphone is composed of analog circuits, which is prone to crosstalk, poor in sound quality and high in power consumption. The purpose of this study is to design a set of wireless hand-held controller, which combines wireless mouse and digital wireless microphone as a whole, has the feature to note and comment on lecture content real-time, and lets teachers no longer be confined to the podium when teaching.The whole system is divided into transmitter and receiver. The transmitter is a hand-held device and is composed of microphone, LCD screen, touch screen and so on. Sliding touch point on the touch screen, you can control mouse, draw straight line or picture on the PC. Meanwhile, the painting patterns can be displayed on the LCD Screen and PC Monitor. The receiver is partly plugged into the PC through the USB port. It transforms the received audio into analog signal output. In addition, mouse and control data is transmitted into PC through USB port.First, the paper analyzes the system architecture and determines the system's overall design proposal. According to the data transmission needs, we formulate the overall design that chooses nRF24L01 as a wireless transmission chip and STM32F103RC as a core control chip. The study also customizes the data transferring formats, and describes the related technology in this design.Secondly, the paper has completed the design of dispay and touch screen module based on LGDP4531, made the system have the ability to note and comment on lecture content real-time. The paper describes the design in two aspects, including hardware and software of touch screen module.Finally, the paper has completed the design of data processing, transmission module and USB interface module. The paper describes in detail the way of how to complete the processing and transmission of voice, mouse and control data, and how to transmit mouse and control data to PC through USB port. The paper also describes the design methods of applications on PC.