一种无线键控系统的设计与实现

在嵌入式系统设计中,经常需要将外部的参数和键盘命令通过无线的方式传递给系统.常见的蓝牙和WIFI模块需要较高的成本,本系统主要服务于课程教学,为了降低成本,本文设计和实现了一种基于DTMF信号的无线键控系统.该系统利用任何手机都具备的DTMF信号作为传输载体,采用Goertzel算法实现按键检测,减轻了后端处理器的负担.在不用安装无线模块的情况下,低成本地实现了无线键控的功能.经MATLAB仿真和DSP实验,表明本系统的设计方案是可行的,系统能够接收手机命令和执行相应的控制功能.

The design and implementation of one wireless key-controlled system

It is usual that external parameter and keyboard command are transmitted to embedded system using wireless method. The common bluetooth and WIFI modules require higher costs. The system mainly serves the course teaching. In order to reduce costs, this paper designs and implements a wireless key-controlled system based on DTMF signals. It used DTMF signal of any mobile phone as transmission medium. The burden of back-end processors was reduced using goertzel algorithm. Low-costwireless key-controlled systemcome true without using wireless module.MATLAB simulation and DSP experiment show that the design scheme of this system is feasible, and the system can receive the commands and perform corresponding control functions.