摘要
随着当今社会通信、网络技术飞速发展，各种智能化、网络化的数字设备不断地涌现。如何摆脱各类错综复杂的有线电缆所带来的烦恼与不便，建立一个舒适、方便、可靠的无线工作环境已成为人们的迫切愿望。因此，区别于传统有线传输的无线数据传输技术应运而生。
本文论述了基于无线的数据传输系统利用专用编解码器和38K载波调制解调电路，来实现红外数据传输。并对各电路单元模块进行了论证与比较。实现完成低误码率、高速率的数据信息传输。本系统通过单片机编程控制、键盘行列扫描输入、数码管动态显示操作，实现红外数据通信。并具有相应的出错提示等功能，具有良好的人机交换界面。
关键词：单片机；数码管显示；红外通信；编解码
ABSTRACT
With the rapid development of communication and network technology, various intelligent and digital network equipments steadily emerged. How to get rid of the trouble and inconvenience of the complicated cable, and establish a comfortable, convenient and reliable wireless work environment has become an urgent desire. So, the wireless data transmission technology which greatly different from the traditional cable transmission, has come out.
The article discussed a data transmission system based on wireless transmission which uses a special coder-decoder IC and 38 KHz carrier modulation-demodulation circuits to achieve infrared data transmission. Then it goes on to verify and compare each modules of this circuit. The system’s main purpose is to achieve the low wrong code rate and high-speed data transmission. By the way of writing program, inputting the ranks of scan code, coding and decoding, it can accomplish correspondence between principal and subordinate machine, and can show out the message when the transmission process arises mistakes. It also has a good man-machine intercom- munication interface.
Key words：MCU; LED display; Infrared communication; Code and decode
目 录
摘要 I
ABSTRACT II
第1章 绪论 1
1.1 课题背景 1
1.2 课题设计的目的及目标 2
第2章 模块方案比较与论证 3
2.1 无线数据传输模块 3
2.2 单片机控制模块 4
第3章 系统硬件设计 6
3.1 系统总体设计 6
3.2 相关芯片介绍 6
3.2.1 单片机AT89C52 7
3.2.2 编解码芯片PT2262/2272 8
3.3 单元电路的设计及原理图 10
3.3.1 红外接收发送模块 10
3.3.2 键盘模块 13
3.3.3 LED数码管显示模块 13
第4章 系统软件设计 15
4.1 概述 15
4.2 发送机程序模块 15
4.3 接收机程序模块 20
4.4 系统测试方案 22
第5章 毕业设计总结 24
致 谢 25
参考文献 26
附录1 键盘扫描程序 27
附录2 设计电路总图 30
