英文翻译基于单片机的电子密码锁Word格式文档下载.docx

1、指导教师 李大海 郑州科技学院电气工程学院 二一四年五月The design of matrix keyboard and LCD display based on MCUAbstractThe development of microelectronics technology and industrial measure requirement bring a good opportunity for development and research system，which makes it a broad prospects. The equipment has the advanta

2、ges of small size, single power supply and a variety of output voltage leads it has a special module. Through the analysis of the hardware structure, we can summarizes each module needs.For example,we often go through the keys to realize the control of the electronic device. Small to watch mobile ph

3、one, to the TV computer, to a variety of complex instruments, all need to realize various operations through the buttons. This design is an important part of step for the further research，using buttons to control the display，include some modules like LCD 1602 liquid crystal display，4*4 matrix keyboa

4、rd，STC89C52single-chip microcomputer and other chips.Combine with the Proteus software，the simulation results are displayed on the LCD in 1602 type of data. KEY WORDS: Single-chip; LCD 1602 liquid crystal display; 4*4 Matrix keyboard1 Introduction With the development of economy and the progress of

5、science and technology, Microprocessors and peripheral chips have developed rapidly. The newest development of the integrated technology is the CPU chip and external. Like the program memory, data memory, parallel, serial, I/O timing / counter, interrupt controller and other control components are i

6、ntegrated in a chipsingle chip. SCM has a manufacturing process CMOS, The smaller lithography process improves integration which make the chip space smaller, lower cost, lower working voltage, lower power consumption. Adopts double CPU structure, increasing the width of data bus, improve the speed a

7、nd the ability of data processing, a pipeline structure, improve the processing and computing speed, in order to meet the needs of real-time control and processing. To increase the storage capacity, the internal EPROM EPPROM, secure program, to improve the driving capability of parallel port, in ord

8、er to reduce the peripheral driving chip, increase the logic function and control the external I/O port flexibility. Peripheral in serial mode based expansion; peripheral circuit internal installation is an obvious trend to connect the internet. Reliability and application level is getting higher an

9、d higher. Some high-end microcontroller and launched in recent years also contains many special function unit, Such as A/D converter, modem, communication controller, PLL, DMA, floating point unit etc.So,as we add some external expansion of the circuit and channel interface it can constitute a varie

10、ty of computer applications, such as industrial control systems, data acquisition system, automatic test system, intelligent instrument, intelligent interface, function module etc. With MCU development and complete structure,SCM has become a powerful tool and will have a higher level and broader dev

11、elopment.2 Design of the whole structure of system This design is based on single-chip, include matrix keyboard and LCD display module. Single-chip is the first model to select the appropriate target, function, reliability, cost, accuracy and speed control system. According to the actual situation o

12、f the topic selection, configuration management model different mainly from the following two aspects: First, supply chain management has strong anti-interference ability; second, SCM has a higher price. For information input module, keyboard selection can use economic benefits and meet the requirem

13、ents of the 4*4 key matrix keyboard can realize multi function key requirements. As for the output module, using LCD 1602 liquid crystal display module, liquid crystal to achieve key information processing functions after the show. The circuit of the system is required by AT89C51 chip, clock circuit

14、, reset circuit, driving circuit, scanning line driving circuit and LCD1602 LCD screen. 4*4 matrix keyboard access of P1.0 P1.7,LCD 1602 screen to access P0.0P0.7.3 System hardware circuit design3.1 Liquid crystal module The principle of liquid crystal display is the use of physical properties of li

15、quid crystal, The display control area voltage, power is displayed, it can display graphics. Liquid crystal display with thin thickness, suitable for large scale integrated circuit directly driven, easy to realize full color display characteristics, has been widely used in many fields of portable co

16、mputer, digital camera, PDA mobile communication tools etc.1602 liquid crystal is also called the 1602 character LCD, which is a special used to display letters, numbers, symbols of the LCD module. It is composed of a plurality of 5X7 or 5X11 dot matrix character components, each dot matrix characte

17、r who can display a character, there is a distance between the interval of each, there are intervals between each line, played the character spacing and row spacing, and because of this it is not well display graphics （with custom CGRAM, show the effect is not good）. 1602 LCD refers to the display o

18、f the content for the 16X2, which can display two lines, 16 characters per line （LCD module display characters and numbers）.3.2 Matrix keyboard module1. Key characteristicsThe keyboard is composed of a number of separate keys, press and release key is through the closed mechanical contact and off to

19、 achieve, because of the elastic action of mechanical contact, in the closing and the opening of the moment has a dither. Jitter must be eliminated, include software and hardware elimination.2Scanning principle First determine whether a key is closed, and then one by one scan to further determine wh

20、ich button closure; （1） D0 D3 output 0, level detection line D4 to D7. If the D4 - level D7 all high, said no key was pressed. If the D4 - level D7 is not all high, said the key was pressed.（2） If no key closure, return the scanning. If there is a button closure, in column by column scanning, closed

21、 key key number to find out. The D0=0, D1 D3=1, D4 D7 level, if D4=0, said the K1 key is pressed; similarly, if the D5 D7=0, K5 respectively, K9, K13 key is down; if the D4 D7=1, said that without a key is pressed. Then the D1=0, D0, D2, D3 was 1, the scanning of the second columns, which were carri

22、ed on, until the closure of the key found.4 Software designThe software design mainly consists of keyboard scanning procedures, write instruction code program of LCD module, LCD module display data initialization code written subroutine, liquid crystal display module, liquid crystal display a charac

23、ter subroutine, time delay subroutine and so on. Programming for each module, software programming ended, Keil software was used for debugging, when the various parts of the program debugging is correct, according to the source sequence of calls, the parts together, compile, compile successfully dow

24、nloaded to the mcu. The result is when the user presses a key, LCD display of the button is pressed after the realization of functional parameters corresponding to the. When the system power supply, P1 port scan cycle and the key button debounce, after completion of input through the SCM processing,

25、 output in the P0 port, through the liquid crystal display program content, complete system function.5 ConclusionWith the continuous development of high and new technology, the miniaturization and the miniaturization of electronic products has been achieved. And all kinds of new technology, as a sin

26、gle field of the new method, the development trend of new products and symbol - intelligent significantly is one of the trends in development. The module design display microcontroller matrix keyboard and LCD, make us understand to this technology innovation, through in-depth study on this technolog

27、y, we can master the use in other areas, such as the design of electronic password lock, adjustment and control of indoor temperature and humidity, field access control system design etc. Technological progress and economic development are the main themes of the present era, the improvement of peopl

28、es living standard is bound to the requirements of electronic products increase, the design of any a small system is for a foundation, design of system innovation, the hardware, software integration, method and technology of virtual display and soft measurement artificial intelligence, I firmly beli

29、eve that our life will be more colourful.基于单片机的矩阵键盘与液晶显示的设计摘要微电子技术的发展和工业测量的需求，给系统的开发及深入研究带来了良好的契机，发展前景广阔。其设备体积小，单电源供电，多种电压输出的特点，使其模块的设计有其特殊性。通过对硬件结构的分析，总结出了各功能模块的需求。例如，我们经常要通过按键来实现对电子装置的控制，小到手表手机，中到电视电脑，大到各种复杂仪器，都需要通过按键来实现各种操作。本次设计作为深入开展进一步的研究是一个重要环节，将以按键控制显示为主题，以LCD 1602液晶显示、4*4矩阵键盘、STC89C52单片机及其接口

30、芯片为核心构造一个键盘控制显示系统，并使用Proteus软件对所设计的电路进行仿真，仿真结果是在LCD 1602液晶上显示键入的数据。关键词：单片机；LCD 1602液晶显示；矩阵键盘1 简介随着经济的进步科技的发展，微处理器及其外围芯片有了迅速的发展。集成技术的最新进展之一是将CPU和外围芯片，如程序存储器、数据存储器、并行、串行、I/O定时计数器、中断控制器及其他控制部件集成在一个芯片之中，制成单片。单片机具有制作工艺 CMOS 化；更小的光刻工艺提高了集成度，从而使芯片更小、成本更低、工作电压更低、功耗更低；采用双 CPU 结构，增加数据总线的宽度，提高数据处理的速度和能力；采用流水线结

31、构，提高处理和运算速度，以适应实时控制和处理的需要。增大存储容量，片内 EPROM 的 EPPROM 化，程序的保密化；提高并行口驱动能力，以减少外围驱动芯片，增加外围 I/O 口的逻辑功能和控制的灵活性；以串行方式为主的外围扩展；外围电路的内装化；和互联网连接已是一种明显的走向；可靠性及应用水平越来越高等。而近年来推出的一些高档单片机还包含有许多特殊功能单元，如?A/D转换器、调制解调器、通信控制器、锁相环、DMA、浮点运算单元等。因此，只要外加一些扩展电路及必要的通道接口就可以构成各种计算机应用系统，如工业控制系统、数据采集系统、自动测试系统、智能仪表、智能接口、功能模块等。单片机结构的发

32、展与完整，其应用系统会向更高层次和更大规模发展。单片机已成为高科技领域中的有力工具。2 系统整体结构设计本次的毕业设计是基于单片机的矩阵键盘输入与液晶显示的设计，首先单片机（SCM）模型选择相应的目标、功能、可靠性、成本，精度和速度控制系统。根据这个主题的实际情况，选择不同的配置管理模型主要考虑从以下两个方面：第一，供应链管理具有较强的抗干扰能力；第二，单片机具有较高的性价比。对于信息的输入模块，键盘的选择可采用经济实惠又满足要求的4*4按键式矩阵键盘，按键丰富可实现多个功能按键需求。至于输出模块，用的是LCD 1602液晶显示模块，实现按键信息功能处理后的液晶显示。该系统实现要求的电路是由STC89C52芯片、时钟电路、复位电路，列扫描驱动电路、行线驱动电路和LCD 1602液晶屏。4*4矩阵键盘接入P1.0P1.7，LCD 1602液晶屏接入P0.0P0.7。3 系统的硬件电路设计3.1 液晶显示模块液晶显示的原理是利用液晶的物理特性，通过电压对其显示区域进行控制，有电就有显示，这样即可以显示出图形。液晶显示器具有厚度薄、适用于大规模集成电路直接驱动、易于实现全彩色显示的特点，目前