基于单片机的红外遥控电子密码锁的外文及翻译

毕业设计 论文 外文资料翻译 学生姓名 学生姓名 朱德涛 学学 号 号 所在学院 所在学院 电子与信息工程学院 专专 业 业 电子信息工程 指导教师 指导教师 毛钱萍 2014年 03 月 15 日 Proceedings of 2009 4th International Conference on Computer Science the PWM pulse width last for 0 56ms interval 1 68 ms as a period of 2 24ms representing the binary 1 The above mentioned 0 and 1 composed of 42 bits binary code as contained in the 38kHz frequency modulation for the second launch in order to enhance efficiency and reduce lower power consumption and then through the infrared diode to send out 0 1 0 56 ms 0 56ms 1 125ms 2 25ms Figure 3 The formation of the signal 2 The infrared receivers Infrared receiver is an integrated circuit including a set of funtions of receiving amplification and shaping without any external components takes all the work compatible with TTLlevel it is suitable for a variety of infrared remote control and infrared signal transferring Infrared receiver transmits the demodulated signal to the single chip AT89S51 by the way of interruption NOTE When there is no infrared signal the output port is in high level so the signal we received is contrary to the signal sent out before 3 The decoding of the infrared signal When we receive a signal containing a synchronized beginning of 9ms low level and 4 5ms high Level it makes us prepare to decode the data The key of decoding is how to identify 0 and 1 According to the formation of the signal we can find that the definition of 0 and 1 starts with 0 56ms low level the only difference between them is the width of the high level 0 bit is 0 56 ms 1 bit is 1 68 ms so we delay 0 9ms to compare the current level for identifying the bit the flow chart as follows N Y N Y initially Waiting interruption function Access the decoding procedure Delay 9ms to check the level is high or not Delay 4 5ms to prepare getting the data Obtain the data code Obtain the anti code data Is the anti code data contrary to the data code Output the data code Turn to the relating procedure according to the data code End Figure 4 The flow chart of decoding 4 The working process of the infrared remote conroller IR transmit receive control circuits are achieved by the AT89S51microcontroller with simple circuit selectable output control method and very practical The specific work process is as follows Launch First sent back the data from the serial transmit port P3 1 to the P1 1 port for internal modem sent out from the P1 2 port and then fired out through the infrared emitting diodes firing distance is about 10m Receipt The infrared receiver head matched with the launch is used sent out the data launched to the serial port 3 0 and then the system will confirm whether the send data are consistent with the receive data yes will unlock no will give up C The design of main circuit According to the design of the analysis the hardware circuitry of single chip electronic locks as shown in the Figure below P0port connect LCDl602 8 bit data bus at the same time P0port is connected to the 8 bit ports of anode sharing digital tube the port of P0 1strobes LED P2 port access 4 3 matrix keyboard circuit while P2 5 P2 6 and P2 7 respectively connect the RS RW E port of the LCD1602 Buzzer alarm prompted by the P3 2 output Figure 5 The design of main circuit III RESULT Accrding to the design the operation is shown as the figures below Figure 6 a unlocking interface When we want to reset the password firstly the system checks out the password is correct or not if the password is right we could get in the next step otherwise the system makes warning Figure 7 Interface of checking the password Figure 8 Interface of reset password IV COCLUSION In this paper an infrared remote control electronic locks was designed and implemented the main technical indicators are the lock opening password storage the effective protection of user s password auto alarm if the wrong password unlock the keyboard of the machine remote unlocking and other functions Because of infrared remote control used in this lock system there are many advantages Infrared launching device use infrared light emitting diodes miniature remote control transmitter is easy and inexpensive use digital signal coded modulation to improve anti interferencewhen signal are transmitted less misoperation low power consumpti on including other advantages such as fast response infrared transmission high transmission efficiency stable and reliable operation Based on these advantages this lock can be widely used in civil doors and warehouse doors In the information age in my opinion the design could play an important part in our daily life and will supplant the tranditon traditional mechanical lock later on Though there is some points needed to improve I also make further research on it to improve the funtion ACKNOWLEDGMENT The authors of this paper would like to thank the anonymous reviewers of this paper for their carefully reading of the manuscript as well as their many helpfully suggestions and corrections This project is supported by the Planning Project of the National Eleventh Five Science and Technology 2007BAK34 B04 and the Chinese National Natural Science Fund and the Program of 985 Innovation Engineering on Information in Xiamen University 2004 2007 REFERENCES 1 Guangfei Microcontroller C Programming examples guide M Beijing Beijing University of Aeronautics and Astronautics Press 2 Zhou Jing PROTEUS based on the single chip system and circuit design and simulation M Beijing Beijing University of Aeron autics and Astronautics Press 3 Han Zhijun Single chip design applications Getting Started guide and design examples M Machinery Industry Press 4 Fu Jiacai SCM technology works in practice M Chemical Industry press 5 Peng Wei Huang Ke Lei Daozhong Typical single chip system design example M Beijing Press of Electronics Industry 2006 299 323 6 Ding Yuanjie Principle and Application of single chip computer M Beijing China Machine Press 2005 45 51 7 C51 Compiler User S Guide M Keil Elektronik GmbH And keil Software Inc 2000 8 Atmcl Corporation 8 bit Microcontroller With4K Bytes In System Programmable Flash M AtmeICorporation 2001 9 MCS 5l family of single chip microcomputers user s mnual M 1981 10 Fenzl Heinz Kliner Alois ELECTRONIC LOCK SYSTEM CONVENIENT AND SAFE Journal article 1987 22 4 150 153 11 Yongxiong Pan He Sha Xiangyang Liu Practical teaching materials of electronic circuit CAD M Xi an Xi an electronic science and technology university publishing company 2001 12 Ur Rehman Ejaz Simple electronic lock uses single transistor circuit Journal article 2003 51 11 67 2009年第四届国际计算机新科技与教育论文集 基于单片机的红外遥控电子锁的设计 薛章成 中国厦门大学自动化院 xuezhangcheng 吴顺祥 中国厦门大学自动化院 wsx1009 摘要 目前 带有报警功能的键盘电子锁正在逐渐取代传统机械锁 它克服了传统机 械锁保密性和可靠性差的缺点 键盘电子锁在技术和性能方面都取得了巨大的 进步 本文介绍了一种基于芯片AT89S51开发的远程遥控电子锁 这种锁有两 个输入设备 一个是安装在锁上的4 3的矩阵键盘 另一个是同样带有4 3的矩 阵键盘的远程控制器 我们可以使用其中的任何一个开锁和修改我们设置的密 码 在本次设计中 我采用红外线作为传输中介 因为红外线有着很强的抗干 扰能力 能够稳定的传输信息 关键词 单片机 电子锁 红外遥控 LCD1602 一 简介 该设计是基于单片机 使用4 3的矩阵键盘和红外远程控制器作为输入 LCD1 602可以显示当你操作步骤时的一些信息 该设计也可以实现密码修改和报警 当要求重设密码时 必须确保输入的密码是正确的 否则会发出声音来提醒 你密码是错误的 在此次设计中 我设定密码为6位 就像银行ATM机上的密 码一样 如果你想开锁的话就必须输入正确的密码 二 设计框架 该设计包括六个模块 主控制器模块 LCD1602模块 4 3键盘模块 红外 遥控模块 报警模块 模拟开锁模块 主控制器模块 一个低功耗 高性能CMOS的8位单片机 它使用的是ATME L公司高密度 非易失性存储技术 与标准指令系统兼容的51单片机 一个8位 通用中央处理单元和ISP Flash存储单元集成在这个芯片上 LCD模块 LCD1602是一个字符液晶显示模块 是一种用来显示字母 数 字 符号等等的点阵LCD 考虑到经济和实际因素 采用LCD1602足以满足字 符显示上的要求 4 3键盘模块 由于单片机的I O口是有限的 所以用矩阵键盘实现电路 这 样 我们可以在键盘上设计足够多的按钮而不用占用单片机过多的端口 红外遥控模块 该设计采用一种通用电视机遥控设备作为输入设备 该设备 可以提供一个 广泛的红外编码格式 所以我们使用 编码脉冲宽度调制的格式 报警模块 该设计中 使用蜂鸣器报警 单片机通过P3 2口输出一个驱动的 音频扬声器方波脉冲 解锁指令 在本设计中 我选择使用LED 灯光来模拟开锁情况 当我们输入密码后 LED灯亮代表锁打开 AT89S51 单片机 图1 设计框架 A 矩阵键盘设计 矩阵键盘工作原理 竖直线通过电阻接 5V电源 当没有按下按键时 竖直线 都处于高电平 否则将和按下按键所在的水平线处于同样的状态 开始 水平 线处于低电平 当我们检查竖直线的状态有变化时 说明有按键被按下 此时 我们记下P2 4口到P2 6口的状态 然后我们依次使P2 0口至P2 3口为高电平 4 3键盘 红外遥控模块 LCD1602 报警电路 模拟解锁 同时检查P2 4口至P2 6口变化情况 当有变化 我们记下此时P2 0口至P2 3口 的状态 这样 我们能知道哪个按键被按下 因为我们已经记下了P2 0口至P2 6口的状态 不同的键有不同编码格式 键盘处理情况如下 首先确定是否有按 键按下 然后确定哪个键被按下 再通过程序获得键码信息 所有键码如下表 表 1 键码值 EE DE BE ED DD BD EB DB BB E7 D7 B7 图2 4 3键盘电路 B 红外遥控设计 1 LC7461简介 目前 有很多芯片用来传输红外线 根据编码格式被分为两个主要类别 和PPM 这里我们选择了比较容易调制的 PWM系列的LC7461芯片 当红 外遥控按钮被按下时 它会发送包含编码格式信息的信号 该信号有如下特征 PWM脉宽0 56ms 间隔0 56ms 以1 12ms为一个周期 代表二进制 0 PWM脉宽0 56ms 间隔1 68ms 以2 24ms为一个周期 代表二进制 1 上面所提到的 0 和 1 由42位二进制码组成 包含在二次发射的38kHz 的调制频率中 用来提高效率并降低功耗 然后通过红外二极管发射出去 图3 信号组成 2 红外接收器 红外接收器是包含接收 放大和整形一些列功能的集成元件 无需任何外部元 件 与需要用TTL电平的所有工作兼容 它适合各种红外线遥控和红外信号传 输 红外接收器通过中断方式将解调过的信号传送给单片机AT89S51 注意 当没有红外信号时 输出端是高电平 所以我们接收到的信号和之前发送出去 的信号是相反的 3 红外信号的解码 当我们接收到一个包含同步开始的9ms低电平和4 5ms高电平的信号时 这提 示我们准备解码 解码关键是如确定 0 和 1 根据信号的组成 0 和 1 都定义为0 56ms低电平开始 唯一的区别是它们高电平的宽度不一样 0 是0 56ms 1 是1 68ms 所以我们延迟0 9ms比较当前电平 以 识别该信号 流程图如下 否 是 否 否 是 等待中断 开始 访问解码程序 延迟9ms检查 是否高电平 延迟4 5ms准备读 数据 获得数据编码 获得反码数据 反码数据是否和 数据编码相反 输出数据编码 根据数据编码转向有 关程序 结束 图4 解码流程图 3 红外遥控器的工作过程 红外发射 接收控制电路使用单片机AT89S51来实现 该电路非常简单 采 用可选择的输出控制方法并且非常实用 该系统具体的工作过程如下 发射 首先 把来自串行传输口P3 1的数据传送回P1 1口进行内部调制 再 从P1 2口发送出去 然后通