远程无线遥控系统硬件电路设计-毕业论文（可编辑）.docVIP

远程无线遥控系统硬件电路设计-毕业论文 With the development of science and technology, wireless control technology is to penetrate all areas. Previously, the main applications of wireless control technology in the military field, the field of industrial production. In recent years, with social and technological development, long-distance wireless remote control technology has penetrated into our daily life, and is widely used. The main graduation project, introduced a single-chip microcomputer AT89C51 and DTMF decoder IC MT8870 as the core, through the telephone lines of the long-range multi-channel remote intelligent controller. The system is practical, flexible and diverse functions can be remotely query the status of the object as well as the control, can be widely used in household appliances or other places of the various control equipment. Keyword: Long-range wireless remote control；DTMF decoder MT8870; AT89C51 1、引言.......................................................................................................................................5 选题背景及意义...................................................................................................................5 2、远程无线遥控系统的组成.........................................................................................5 2.1 系统组成.................................各部分电路及工作原理………......................................................................... .....5 3、电路设计 ..........................................................11 3.1 振铃检测电路 12 3.2 电话自动摘机和挂机电路 12 3.3 音频放大电路 13 3.4 DTMF信号解码电路 13 3. 5 电器控制电路………………………………………………………………………15 4、电路元件选择 15 4.1 芯片的选择.................................................................................................................15 4.2 电阻、电容、电感的选择.....................................................................................16 4.3 MIC、喇叭、三极管的选择......................................................................................18 4.4 电子元件....................