单片机红外遥控外文翻译知识交流

Infrared Remote And Chips Are Introduced

People's eyes can see the visible wavele ngth from long to short accord ing to the arrangement, in order to red, orange, yellow, green, green, blue, violet. One of the red wavelengths for 0.62 ~ 0.76 mount, Purple is 0.38 wavelength range ~ mount. Purple is shorter than the wavelength of light called ultraviolet ray, red wavele ngths of light is Ion ger tha n that of in frared light. In frared remote control is to use wavelength for 0.76 ~ 1.5 mount between the near in frared to tran sfer con trol sig nal.

Com mon ly used in frared remote con trol system of gen eral poi nts transmit and receive two parts. The main component part for the launch of infrared light emitting diode. It is actually a special light emitting diode, due to its internal material differs from ordinary light emitting diode, resulting in its ends on certain voltage, it is a rather infrared light. Use of infrared light emitti ng diode the in frared wavele ngths, for 940nm appeara nee and ordin ary, just the same light emitting diode five different colors. Infrared light emitting diode gen erally have black and blue, tran spare nt three colors. Judgme nt of infrared light emitting diode and judgment method, using a millimeter to ordinary diode electric block measure of in frared light emitti ng diode, reverse resista nee. The in frared light emitti ng diode lumin esce nce efficie ncy to use special in strume nt to measure precise, and use only spare con diti ons to pull away from roughly judgme nt. Recei ving part of in frared recei ving tube is a photose nsitive diode.

In actual application of it receiving diode to reverse bias, it can work normally, i.e., the infrared receiving circuit application in diode is used to reverse, higher sensitivity. Infrared receiving diode usually have two round and rectangular. Due to the power of infrared light emitting diode (or less commonly 100mW), so ir receiving diode received signals is weak, so will in crease high-

ga in on es.the amplifier circuit.

In common CX20106A, etc. PC1373H moon infrared receiving special amplifier circuit. In recent years both amateur or formal products, mostly using in frared recei ving head fini shed. The head of in frared recei ving product packages gen erally has two kin ds: one kind USES sheet shield ing, A kind of plastic packaging. There are three pin, namely the power is (VDD), power negative (GND) and data output (VO or OUT). Infrared receiving head foot arrangement for types varied, manufacturer's instructions. Finished the advantages of infrared receiving head is not in need of sophisticated debugg ing and shell scree n, use rise as a tran sistor, very convenient. But whe n used in the infrared receiving attention finished first carrier frequency.

In frared remote com mon carrier freque ncy for 38kHz, this is tran smitted by using 455kHz Tao Zhen to decide. At the launch of crystals were integer frequency, frequency coefficients, so commonly 12, so 455kHz 宁12 hun dredth kHz 38kHz hun dredth 379,000. Some remote con trol system adopts 36kHz, 56kHz, etc. general 40kHz launched by the crystals of oscillation freque ncy to decide.

In frared remote characteristic is not in flue nee the surro unding environment and does not interfere with other electric equipment. Due to its cannot pen etrate walls, so the room can use com mon household applia nee of remote control without mutual interferenee, Circuit testing is simple, as long as give n circuit connection, gen erally does not n eed any commissi oning can work, Decod ing easily, can un dertake multiple remote con trol. Because each manufacturer produces a great deal of infrared remote application-specific integrated circuit, when need press diagram so jip. Therefore, the infrared remote now in household applia nces, in door close (less tha n 10 meters) in the remote con trol is widely used.

Multiple infrared remote control system of infrared emission control buttons, there are many parts general representative of different control

function. Whe n pressed a butt on, corresp ondin gly in the receiver with differe nt output.

Receiving the output state can be roughly divided into pulse, level, self-lock ing and in terlock, data five forms. "The pulse output is accord ing to laun ch" whe n the butt on, the receiver output term in als output corresp onding "effective", a pulse width 100ms in general. "Level" refers to the output launch press butt on, the receiver output corresp onding output level ", "effective transmit to loosen the receiver" level "disappears. This "effective pulse" and "effective", may be of high level is low, and may also depe nd on the output corresponding static state, such as feet for low, static "high" for effective, As for the static, "low" high effective. In most cases, "high" for effective. "Si nee the lock" refers to launch the output of each time you press the butt on, a receiver output corresp onding cha nge, n amely origi nally a state for high level into a low level, orig in ally for low level into high level. The output power switch and mute as control etc. Sometimes also called the output form for "i nv ert". "The in terlock" refers to multiple outputs each output, at the same time only one output. The TV sets of this case is selected, the other is like the light and sound in put speed, etc.

"Data" refers to launch the output some key, use a few output form a bi nary nu mber, to represe nt differe nt keystroke.

Normally, the receiver except a few data output, but also a "valid" output data, so the timely to collect data. This output form with single-chip microcomputer or are com monly used in terface. In additi on to the above output form outside, still have a "latch" and "temporary" two forms. The so-called "latch" refers to launch the output signal of each hair, the receiver output corresponding ", "new store until you receive signals. "Temporary" output and the in troducti on of "level" output is similar.

Remote dista nee (Remote Con trol effect of RF Remote Con trol dista nee)

are the major factors as follows:

https://www.360docs.net/doc/2a19012413.html,un ched in power tran smissi on power: while dista nee, but great power con sumpti on, easy to gen erate in terfere nee.

2. and receiving the receiver sensitivity, receiving, remote distanee in creased sen sitivity to improve, but easy to cause disturba nee maloperati on or abuse.

3. antenna, using linear antenna, and parallel, remote distanee, but occupies a large space, in use the antenna spin, pull can in crease the remote dista nee.

4. and the higher height: antenna, remote farther, but by objective eon diti ons.

5. a nd stop: curre nt use of wireless remote use of UHF band stipulated by the state, the propagation characteristics of approximate linear transmission, light, small, transmitters and receivers diffraction between such as walls are block ing will greatly disco un ted remote dista nee, if is rein forced eon crete walls, due to the absorpti on effect eon ductor, radio waves.

Con sideri ng the desig n of hardware volume small to be embedded in the remote eontrol, so we chose 20 foot single-chip chip AT89C2051. Below is the in troducti on of the fun eti on.

(1)AT89C2051 internal structure and performanee

AT89C2051 is a byte flash 2K with programmable read-only memory can be erased EEPROM (low voltage, high performanee of eight CMOS microcomputer. It adopts ATMEL of high-density non-volatile storage tech no logy manu facturi ng and in dustrial sta ndard MCS - 51 in structi on set and lead. Through the comb in ati on of sin gle chip in gen eral CPL1 and flash memory, is a strong ATMEL AT89C2051 microcomputer, its application in many embedded control provides a highly flexible and low cost solutions. The compatible with 8051 AT89C2051 is CHMOS micro eontroller, the Flash memory capacity for 2KB. And CHMOS 80C51 process, have two kinds of

leisure and power sav ing operati on mode. The performa nee is as follows.

5. CUP, 2KB Flash memory,

Working voltage range 2.7-6V, 128KB data storage.The static working way: 0-24MH z, 15 root in put/output line.

A programmable serial, 2 a 16-bit timing/counters.There is a slice of in side precisi on simulatio n comparator, 5 the in terrupt sources, 2 priority.

Programmable serial UART channel, Directly LED driver output,The internal structure of AT89C2051 is shown in figure 1.

Figure 1 AT89C2051 in terior structure

(2)AT89C2051 chip pin and function

In order to adapt to the requireme nt of in tellige nt in strume nt, embedded in the chip foot AT89C2051 simplified configuration, as shown in figure b. The major cha nges to: (1) the lead foot from 20 to 40 wires, (2) in creased a simulated comparator.=Diagram b AT89C2051 foot figure.

AT89C2051 pin fun ctio n:

1. the VCC: voltage.

2. to GND.

3. P1 mouth: P1 mouth is an 8-bit two-way I/O port. P1.2 ~ P1.7 mouth pin the internal resista nee provides. P1.0 and P1.1 requireme nts on the external pull-up resistors. P1.0 and P1.1 also separately as piece in side precisi on simulatio n comparator with in put (AIN0) and reversed-phase in put (AIN1). Output buffer can absorb the P1 mouth 20mA current and can directly LED display driver. Whe n P1 mouth pin in to a "1", can make its in put. Whe n the pin P1.2 ~ P1.7 as in put and external dow n, they will be for the in ternal resista nee and flow curre nt (IIL). I n flash P1 mouth duri ng the procedure and program code data recei ving calibrati on.

4. P3: the P3.0 ~ P3.5 P3, P3.7 is the in ternal resista nee with seven two-way I / 0 lead. P3.6 for fixed in puts piece in side the comparator output sig nal and it as a gen eral I/O foot and in accessible. P3 mouth buffer can absorb

20mA curre nt. When P3 mouth pin in to "1", they are the in ternal resista nceca n push and in put. As in put, and the low exter nal P3 mouth pin pull-up resistors and will use current (IIL) outflow. P3 mouth still used to implement the various functions, such as AT89C2051 shown in table P3 mouth still receive some for flash memory programming and calibration of program con trol sig nals.

5. RST: reset in put. RST once, all into high level I/O foot will reset to "1". When the oscillator is running, continuous gives RST pin two machine cycle of high level can finish reset. Each machine cycle to 12 oscillator or clock cycle.

6. XTAL1: as the oscillator amplifier in put and in verse internal clock generator in put.

7. XTAL2: as the oscillator reversed-phase the amplifier's output.P3 mouth fun cti on as is show n in table 1.

addresses, will not meet wrong results. The scope of data storage is OOH

(7FH --whe n stack man ipulatio n), also should be no ticed.

The in put sig nal is simulated by the origi nal P3.6 foot into the microcontroller, so the original P3.6 foot.

Un able to exter nal use. Simulati on comparator can compare two simulation, if the size of the voltage external A D/A converter and its output as A comparator an alog in put, and by simulati ng the comparator ano ther in put voltage to be measured, through the in troduct ion of the software method can realize the A/D con versi on.

8. the Flash memory AT89C2051)

Provide a 2KB of si ngle-chip AT89C2051 in Flash memory chips, which allows the online program to modify or use special programming program ming.

(1) F lash memory en crypti on

AT89C2051 SCM has 2 encryption, can programming (P) or programming (U) to obtain different encryption functionality. Encryption functionality table as shown in table 1-1.

En crypt a content erased only through chips to erase operatio n.

(2) F lash memory program ming and procedures the piece in side chip AT89C2051 Flash memory program ming.

Note:

1. the cou nters RESET at an EPROM in side the risi ng edge, and 000H RESET to XTAL1 by foot is executed, pulse count.

2. pieces of 10ms to erase PROG pulse.

3. during the programming P3.1 pulled low RDY/BSY instructions.

(3) A T89C2051 SCM in Flash memory chips program ming steps are as follows:

1.in the seque nee is the VCC GND pin, add worki ng voltage, XTAL1 pin RESET, recei ving GND pin, other tha n the above time, wait ing for 10ms.

2.In P

3.2 pin RESET, heighte ning level.

3.In P3.3, P3.4, P3.5, P3.7 pin; add model multilevel.

4. P1.0 P1.7 -- for the 000H unit add data bytes.

5. RESET to in crease the 12V activati on program ming.

6. P3.2 jump to a one byte programming or encryption.

7. calibration has been programming, data from 12V to RESET logic level "H" and set P3.3 P3.7 -- for the correct level, and can output data in P1 mouth.

8. For the n ext addresses) in the unit XTAL1 byte program ming, a pulse, make address coun ter add 1, in mouth add program ming data.

9. programmi ng and calibrati on circuit figure c, d.Figure c program ming circuit Figure d calibratio n circuit Expla nati on:

(1) P3.1 duri ng programmi ng in structio ns to be low RDY/BSY,

(2) single erasing the PROG 10ms need,

(3) internal EEPROM address coun ter on the rising edge RESET, and 000H RESET to XTAL1 by foot pulses are executed.

Along with the rapid developme nt of scie nee and tech no logy, huma n society has un derg one earth-shak ing cha nges. Make our life more colorful. I n these cha nges, the remote control tech no logy has bee n widely permeates TV aerospace, military, sports and other producti on, all aspects of life. From the broad sense, all equipped with electric locomotive facility or electrical switches, if feel some n ecessary, can con sider to improve existi ng with remote control device, the operation fixed switch to realize the remote operation of the origi nal equipme nt, stop, the variable, etc. Fun cti on.

switch, for example, can be used to control the electric control switch the light switch, We design the infrared remote control system to realize the opponent switch quantity control. Infrared remote characteristic is not in flue nce the surro unding en vir onment and does not in terfere with other electric equipment. Due to its cannot penetrate walls, so the room can use com mon household applia nce of remote con trol without mutual in terfere nce, Circuit testi ng is simple, as long as give n circuit conn ecti on, gen erally does not need any commissioning can work, Decoding easily, can undertake multiple remote con trol.

红外遥控

人的眼睛能看到的可见光按波长从长到短排列，依次为红、橙、黄、绿、青、蓝、紫。其中红光的波长范围为0.62?0.76um；紫光的波长范

围为0.38~0.46。比紫光的波长还要短的光叫紫外线，比红光的波长还要长的光叫红外线。红外线遥控技术就是利用波长为0.76?1.5卩m之间的近红外线来传送控制信号的。常用的红外遥控系统一般分发射和接收两个部分。发射部分的主要元件为红外发光二极管。它实际上是一只特殊的发光二极管，由于其内部材料不同于普通发光二极管，因而在其两端施加一

定电压时，它便发出的是红外线而不是可见光。目前大量使用的红外发光

二极管发出的红外线波长为940nm左右，外形与普通5发光二极管相同，只是颜色不同。红外发光二极管一般有黑色、深蓝、透明三种颜色。判断红外发光二极管好坏的办法与判断普通二极管一样：用万用表电阻挡量一下红外发光二极管的正、反向电阻即可。红外发光二极管的发光效率要用专门的仪器才能精确测定，而业余条件下只能用拉距法来粗略判定。接收部分的红外接收管是一种光敏二极管。

在实际应用中要给红外接收二极管加反向偏压，它才能正常工作，亦

即红外接收二极管在电路中应用时是反向运用，这样才能获得较高的灵敏度。红外接收二极管一般有圆形和方形两种。由于红外发光二极管的发射功率都较小，所以红外接收二极管接收到的信号比较微弱，因此就要增加

高增益放大电路。

前些年常用卩PC1373H CX20106A等红外接收专用放大电路。最近几年不论是业余制作还是正式产品，大多都采用成品红外接收头。成品红外接收头的封装大致有两种：一种采用铁皮屏蔽；一种是塑料封装。均有三只引脚，即电源正、电源负和数据输出（VO或OUT。红外接收头的引脚排列因型号不同而不尽相同，可参考厂家的使用说明。成品红外接头的优点是不需要复杂的调

试和外壳屏蔽，使用外壳屏蔽，使用起来如同一只三极管，非常方便。但在使用时注意成品红外接收头的载波频率。

红外遥控常用的载波频率为38kHz,这是由发射端所使用的455kHz 陶振来决定的。在发射端要对晶振进行整数分频系数一般取12,所455kHz -12~ 37.9kHz ?38kHz。也有一些遥控系统采用36kHz、40kHz、56kHz 等，一般由发射端晶振的振荡频率来决定。

红外遥控的特点是不影响周边环境、不干扰其它电器设备。由于其无法穿透墙壁，故不同房间的家用电器可使用通用的遥控器而不会产生相互干扰；电路调试简单，只要按给定电路连接无误，一般不需任何调试即可投入工作；编解码容易，可进行多路遥控。由于各生产厂家生产了大量红外遥控专用集成电路，需要时按图索骥即可。因此，现在红外遥控在家用电器、室内近距离（小于10米）遥控中得到了广泛的应用。

多路控制的红外遥控系统多路控制的红外发射部分一般有许多按

键，代表不同的控制功能。当发射端按下某一按键时，相应地在接收端有不同的输出状态。

接收端的输出状态大致可分为脉冲、电平、自锁、互锁、数据五种形式。“脉冲”输出是当按发射端按键时，接收端对应输出端输出一个“有效脉冲”，宽度一般在100ms左右。“电平”输出是指发射端按下键时，接收端对应输出端输出“有效电平”，发射端松开键时，接收端“有效电平”消失。此处的“有效脉冲”和“有效电平”，可能是高、也可能是低，取决于相应输出脚的静态状况，如静态时为低，则“高”为有效；如静态时为高，则“低”为有效。大多数情况下“高”为有效。“自锁”输出是指发射端每按一次某一个键，接收端对应输出端改变一次状态，即原来为高电平变为低电平，原来为低电平变为高电平。此种输出适合用作电源开关、静音控制等。有时亦称这种输出形式为“反相”。“互锁”输出是指多个输出互相清除，在同一时间内只有一个输出有效。电视机的选台就属此种情况，其它如调光、调速、音响的输入选择等。“数据”输出是指把一些发射键编上号码，利用接收端的几个输出形成一个二进制数，来代表不同的按键输入。

一般情况下，接收端除了几位数据输出外，还应有一位“数据有效” 输出端，以便后级适时地来取数据。这种输出形式一般用于与单片机或微机接口。除以上输出形式外，还有“锁存”和“暂存”两种形式。所谓

“锁存”输出是指对发射端每次发的信号，接收端对应输出予以“储存”，直至收到新的信号为止；“暂存”输出与上述介绍的“电平”输出类似。

影响遥控器遥控距离(Remote distanee of RF Remote Control )的因素主要有如下几点：

1、发射功率：发射功率大则距离远，但耗电大，容易产生干扰；

2、接收灵敏度：接收器的接收灵敏度提高，遥控距离增大，但容易受干扰造成误动或失控；

3、天线：采用直线型天线，并且相互平行，遥控距离远，但占据空间大，在使用中把天线拉长、拉直可增加遥控距离；

4、高度：天线越高，遥控距离越远，但受客观条件限制；

5、阻挡：目前使用的无线遥控器使用国家规定的UHF频段，其传播特性和光近似，直线传播，绕射较小，发射器和接收器之间如有墙壁阻挡将大大打折遥控距离，如果是钢筋混泥土的墙壁，由于导体对电波的吸收作用，影响更甚。

考虑到本次设计的硬件体积应偏小以便嵌入遥控器中，因此我们选择了20个引脚的单片机芯片AT89C2051下面即介绍此芯片的功能。

⑴AT89C2051的内部结构及性能

AT89C2051是一带有2K字节闪速可编程可擦除只读存储体(EEPROM) 的低电压,高性能8位CMO微型计算机。它采用ATMEL勺高密非易失存储技术制造并和工业标准MC—51指令集和引脚结构兼容。通过在单块芯片上组合通用的CPL1和闪速存储器，ATMELAT89C2051是一强劲的微型计算机，它对许多嵌入式控制应用提供一高度灵活和成本低的解决办法。

AT89C2051是与8051兼容的CHMO微控制器，其Flash存储器容量为2KB 与CHMO工艺的80C51 一样，具有空闲和掉电两种节电运行方式。其性能

如下：

8 位CUP

2KB的Flash存器；

工作电压范围2.7 —6V;

128KB的数据存储器；

全静态工作方式：0—24MHz

15根输入/输出线；

一个可编程串行口；

2个16位定时/计数器；

有片内精密模拟比较器；

5个中断源，2个优先级；

可编程串行UART!道；

直接LED驱动输出。

为适应智能仪表的嵌入要求，AT89C2051在芯片的引脚配上进行

了简化，如图b所示。主要变化为：

(1) 引脚由40根减为20根；

⑵增加了一个模拟比较器。

AT89C2051引脚功能：

1. Vcc :电源电压。

2. GND :地。

3. P1 口：P1 口是一8位双向I/O 口。口引脚P1.2?P1.7提供内部上拉电阻。P1.0和P1.1要求外部上拉电阻。P1.0和P1.1还分别作为片内精密模拟比较器的同相输入(AIN0)和反相输入(AIN1)。P1 口输出缓冲器可吸收20mA电流并能直接驱动LED显示。当P1 口引脚写入“ 1”时, 其可用作输入端。当引脚P1.2?P1.7用作输入并被外部拉低时,它们将因内部的上拉电阻而流出电流(IIL) 0 P1 口还在闪速编程和程序校验期间接收代码数据。

4. P3 口：P3 口的P3.0?P3.5、P3.7是带有内部上拉电阻的七个双向

I/0弓I脚。P3.6用于固定输入片内比较器的输出信号并且它作为一通

用I/O引脚而不可访问。P3 口缓冲器可吸收20mA电流。当P3 口引脚写入“1”时，它们被内部上拉电阻拉高并可用作输入端。用作输入时，被外部拉低的P3

口引脚将用上拉电阻而流出电流（IIL）。P3 口还用于实现AT89C205啲各种功能，如下表1所示。P3 口还接收一些用于闪速存储器编程和程序校验的控制信号。

5. RST :复位输入。RST一旦变成高电平,所有的I/O引脚就复位到

“ 1”。当振荡器正在运行时,持续给出RST引脚两个机器周期的高电平便

可完成复位。每一个机器周期需12个振荡器或时钟周期。

6. XTAL1 :作为振荡器反相放大器的输入和内部时钟发生器的输入。

7. XTAL2 :作为振荡器反相放大器的输出。

P3

（3） AT89C2051的软硬件约束

AT89C205仲片机由于引脚的限制，没有设置外部存储器的接口，所以，对于外部存储器的读/写指令如MOV等不起作用。

由于ROM空间为2KB所以，对于跳转指令要注意转移的目的地址范围（000H—7FFH ,超出地址范围时，将产生不可遇见的错误结果。数据存储的范围是（00H—7FH，堆栈操作时亦应加以注意。

模拟比较器的输入信号经原来的P3.6引脚引入到单片机内，所以原来的P3.6脚已无法再外部使用。模拟比较器可以方便的比较两个模拟电压的大小，若外接一个D/A转换器并将其输出作为模拟比较器的一个输入，而由模拟比较器的另一个输入端引入被测电压，通过软件的方法也可

以实现A/D转换。

4）AT89C2051的Flash存储器编程

AT89C205仲片机提供有2KB的片内Flash程序存储器，它允许在线修改或使用专用编程器编程。

Flash存储器加密位

AT89C205仲片机有2个加密位，可以编程(P)或不编程(U)以获得不同的加密功能。加密位内容的擦除只能通过片擦除操作来完成。Flash 存储器的编程和程序校验

1. AT89C2051单片机的片内Flash存储器编程模式。

注：①内部EPROM勺计数器在RESET的上升沿复位到000H,并由XTAL1引脚正脉冲执行计数；

②片擦除需要10ms的PRO咏冲；

③编程期间P3.1被拉低来指示RDY/BSY

2. AT89C2051单片机的片内Flash存储器编程步骤如下：

①上电次序是在VCC GND引脚加工作电压，RESET XTAL1引脚接到GND悬浮其它引脚，等待大于10ms以上时间；

②在RESET P3.2引脚加高电平；

③在P3.3、P3.4、P3.5、P3.7引脚加模式电平；

④经P1.0 —P1.7对000H单元加入数据字节；

⑤升高RESETS 12V激活编程；

⑥使P3.2跳变一次，编程一个字节或加密位；

⑦校验已被编程数据，使RESETS 12V降到逻辑电平“H'并设置P3.3 —P3.7为正确的电平，可以在P1 口输出数据；

⑧进行下一地址单元的字节编程，在XTAL1加一脉冲，使地址计数器

加1,在P1 口加入编程数据。

重复步骤①一⑧，完成整个2KB的编程。

下电次序为：设置XTAL1、RESE为“ L” ,浮空其它I/O引脚，关闭VCC 电源。

说明几点：

(1) 编程期间P3.1被拉低来指示RDY/BSY

(2) 单片擦除需要10ms的PROG

(3)内部EEPROM地址计数器在RESET的上升沿复位到000H,并由XTAL1引脚正脉冲执行计数。

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