全自动洗衣机毕业论文

摘 要

本设计针对全自动洗衣机硬软件设计，主要核心芯片采用的是AT89C51，还运用了通用可编程的键盘、显示芯片8279为辅助芯片。通过设计晶闸管驱动电路、水位控制电路、报警装置及CPU软件程序设计， 能够实现洗衣机在没有人看管的情况下自动完成：进水、洗衣、漂洗、脱水、自动报警等功能。还可以设置了强力洗涤、轻柔洗涤、快速洗涤、标准洗涤、预约等功能按键，方便用户选择不同档位的洗涤，按键功能由8279芯片控制完成实现。

关键词： 单片机AT89C51；8279

Abstract

In the design of hardware and software design of automatic washing machine, the main core chip USES is AT89C51, still use the keyboard, the general programmable 8279 display chip for auxiliary chip. Through the design thyristor drive circuit and control circuit, alarm device and software design, the CPU can achieve the washing machine in unguarded situation automatically: feed, laundry, rinse, dehydration, automatic alarm function. Can also set up a strong washing, cleaning, washing and rapid gentle washing, the function such as standard appointment, convenient washing, choose different gear by 8279 chip control key functions. Keywords: SCM AT89C51； 8279

目 录

第一章 绪论........................................................... 1

1.1 目的和意义.................................... .............. 1 1.2 单片机和全自动洗衣机介绍..................................... 1 1.2.1单片机的介绍............................................. 1 1.2.2全自动洗衣机介绍......................................... 2 1.3 全自动洗衣机介绍及主要功能................................... 4 1.3.1 全自动洗衣机介绍......................................... 4 1.3.2 全自动洗衣机主要功能..................................... 4

第二章 总体方案设计与硬件设计......................................... 5

2.1 电路总体框图设计............................................. 5 2.2 MCS-51单片机硬件结构介绍......................................6 2.2.1 MCS–51单片机内部总体结构................................6 2.2.2 MCS-51 的微处理器.........................................9 2.2.3 MCS-51的I/O口和外接电路.................................14 2.3 主控芯片AT89C51的介绍...................................... 17 2.3.1 时钟电路设计................................................. 21 2.3.2 复位电路设计................................................. 22 2.4 键盘扫描及显示设计...........................................23 2.4.1硬件电路图.............................................. 23 2.4.2 8279芯片介绍............................................ 24 2.4.3 ULN2803芯片介绍......................................... 26

2.4.4 74LS138芯片介绍......................................... 27 2.4.5 LED显示设计............................................. 29 2.5 水位检测设计................................................ 32 2.6 晶闸管驱动控制电路设计...................................... 33 2.7 自动报警电路设计............................................ 35 2.8 电源电路设计............................................... 36 第三章 软件设计...................................................... 37

3.1 软件流程图设计............................................. 37 3.2 程序设计及其说明............................................ 42 第四章Proteus软件介绍................................................54 外文资料............................................................. 55 中文译文............................................................. 62 参考文献............................................................. 70 致谢................................................................. 71 附录................................................................. 72 附录1 元器件清单.................................................... 72 附录2 系统原理图.................................................... 73