单片机红外遥控外文翻译(共16页).doc

《单片机红外遥控外文翻译(共16页).doc》由会员分享，可在线阅读，更多相关《单片机红外遥控外文翻译(共16页).doc（16页珍藏版）》请在淘文阁 - 分享文档赚钱的网站上搜索。

1、精选优质文档-倾情为你奉上Infrared Remote And Chips Are IntroducedPeoples eyes can see the visible wavelength from long to short according 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

2、 is shorter than the wavelength of light called ultraviolet ray, red wavelengths of light is longer than that of infrared light. Infrared remote control is to use wavelength for 0.76 1.5 mount between the near infrared to transfer control signal.Commonly used infrared remote control system of genera

3、l points 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

4、light. Use of infrared light emitting diode the infrared wavelengths, for 940nm appearance and ordinary, just the same light emitting diode five different colors. Infrared light emitting diode generally have black and blue, transparent three colors. Judgment of infrared light emitting diode and judg

5、ment method, using a millimeter to ordinary diode electric block measure of infrared light emitting diode, reverse resistance. The infrared light emitting diode luminescence efficiency to use special instrument to measure precise, and use only spare conditions to pull away from roughly judgment. Rec

6、eiving part of infrared receiving tube is a photosensitive 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 re

7、ctangular. Due to the power of infrared light emitting diode (or less commonly 100mW), so ir receiving diode received signals is weak, so will increase high-gain ones.the amplifier circuit.In common CX20106A, etc. PC1373H moon infrared receiving special amplifier circuit. In recent years both amateu

8、r or formal products, mostly using infrared receiving head finished. The head of infrared receiving product packages generally has two kinds: one kind USES sheet shielding, A kind of plastic packaging. There are three pin, namely the power is (VDD), power negative (GND) and data output (VO or OUT).

9、Infrared receiving head foot arrangement for types varied, manufacturers instructions. Finished the advantages of infrared receiving head is not in need of sophisticated debugging and shell screen, use rise as a transistor, very convenient. But when used in the infrared receiving attention finished

10、first carrier frequency.Infrared remote common carrier frequency for 38kHz, this is transmitted by using 455kHz Tao Zhen to decide. At the launch of crystals were integer frequency, frequency coefficients, so commonly 12, so 455kHz 12 hundredth kHz 38kHz hundredth 379,000. Some remote control system

11、 adopts 36kHz, 56kHz, etc. general 40kHz launched by the crystals of oscillation frequency to decide.Infrared remote characteristic is not influence the surrounding environment and does not interfere with other electric equipment. Due to its cannot penetrate walls, so the room can use common househo

12、ld appliance of remote control without mutual interference, Circuit testing is simple, as long as given circuit connection, generally does not need any commissioning can work, Decoding easily, can undertake multiple remote control. Because each manufacturer produces a great deal of infrared remote a

13、pplication-specific integrated circuit, when need press diagram so jip. Therefore, the infrared remote now in household appliances, indoor close (less than 10 meters) in the remote control is widely used.Multiple infrared remote control system of infrared emission control buttons, there are many par

14、ts general representative of different control function. When pressed a button, correspondingly in the receiver with different output.Receiving the output state can be roughly divided into pulse, level, self-locking and interlock, data five forms. The pulse output is according to launch when the but

15、ton, the receiver output terminals output corresponding effective, a pulse width 100ms in general. Level refers to the output launch press button, the receiver output corresponding output level , effective transmit to loosen the receiver level disappears. This effective pulse and effective, may be o

16、f high level is low, and may also depend 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. Since the lock refers to launch the output of each time you press the button, a receiver outpu

17、t corresponding change, namely originally a state for high level into a low level, originally for low level into high level. The output power switch and mute as control etc. Sometimes also called the output form for invert. The interlock refers to multiple outputs each output, at the same time only

18、one output. The TV sets of this case is selected, the other is like the light and sound input speed, etc.Data refers to launch the output some key, use a few output form a binary number, to represent different keystroke.Normally, the receiver except a few data output, but also a valid output data, s

19、o the timely to collect data. This output form with single-chip microcomputer or are commonly used interface. In addition 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 correspondi

20、ng , new store until you receive signals. Temporary output and the introduction of level output is similar.Remote distance (Remote Control effect of RF Remote Control distance) are the major factors as follows:1.launched in power transmission power: while distance, but great power consumption, easy

21、to generate interference.2.and receiving the receiver sensitivity, receiving, remote distance increased sensitivity to improve, but easy to cause disturbance maloperation or abuse.3.antenna, using linear antenna, and parallel, remote distance, but occupies a large space, in use the antenna spin, pul

22、l can increase the remote distance.4.and the higher height: antenna, remote farther, but by objective conditions.5.and stop: current use of wireless remote use of UHF band stipulated by the state, the propagation characteristics of approximate linear transmission, light, small, transmitters and rece

23、ivers diffraction between such as walls are blocking will greatly discounted remote distance, if is reinforced concrete walls, due to the absorption effect conductor, radio waves.Considering the design of hardware volume small to be embedded in the remote control, so we chose 20 foot single-chip chi

24、p AT89C2051. Below is the introduction of the function.（1）AT89C2051 internal structure and performanceAT89C2051 is a byte flash 2K with programmable read-only memory can be erased EEPROM (low voltage, high performance of eight CMOS microcomputer. It adopts ATMEL of high-density non-volatile storage

25、technology manufacturing and industrial standard MCS - 51 instruction set and lead. Through the combination of single chip in general 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 comp

26、atible with 8051 AT89C2051 is CHMOS micro controller, the Flash memory capacity for 2KB. And CHMOS 80C51 process, have two kinds of leisure and power saving operation mode. The performance is as follows.5.CUP, 2KB Flash memory,Working voltage range 2.7-6V, 128KB data storage.The static working way:

27、0-24MHz, 15 root input/output line.A programmable serial, 2 a 16-bit timing/counters.There is a slice of inside precision simulation comparator, 5 the interrupt sources, 2 priority.Programmable serial UART channel, Directly LED driver output,The internal structure of AT89C2051 is shown in figure 1.F

28、igure 1 AT89C2051 interior structure（2）AT89C2051 chip pin and functionIn order to adapt to the requirement of intelligent instrument, embedded in the chip foot AT89C2051 simplified configuration, as shown in figure b. The major changes to: (1) the lead foot from 20 to 40 wires, (2) increased a simul

29、ated comparator.=Diagram b AT89C2051 foot figure.AT89C2051 pin function: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 resistance provides. P1.0 and P1.1 requirements on the external pull-up resistors. P1.0 and P1.1 also separately as

30、 piece inside precision simulation comparator with input (AIN0) and reversed-phase input (AIN1). Output buffer can absorb the P1 mouth 20mA current and can directly LED display driver. When P1 mouth pin into a 1, can make its input. When the pin P1.2 P1.7 as input and external down, they will be for

31、 the internal resistance and flow current (IIL). In flash P1 mouth during the procedure and program code data receiving calibration.4.P3: the P3.0 P3.5 P3, P3.7 is the internal resistance with seven two-way I / 0 lead. P3.6 for fixed inputs piece inside the comparator output signal and it as a gener

32、al I/O foot and inaccessible. P3 mouth buffer can absorb 20mA current. When P3 mouth pin into 1, they are the internal resistance can push and input. As input, and the low external P3 mouth pin pull-up resistors and will use current (IIL) outflow. P3 mouth still used to implement the various functio

33、ns, such as AT89C2051 shown in table P3 mouth still receive some for flash memory programming and calibration of program control signals.5.RST: reset input. 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 leve

34、l can finish reset. Each machine cycle to 12 oscillator or clock cycle.6.XTAL1: as the oscillator amplifier input and inverse internal clock generator input.7.XTAL2: as the oscillator reversed-phase the amplifiers output.P3 mouth function as is shown in table 1.Table 1P3 mouth pinFunctionP3.0RXD(Ser

35、ial input)P3.1TXD(Serial output port)P3.2INT0(External interruption 0)P3.3INT1(External interruption 1)P3.4TO(The timer 0 external input)P3.5T1(The timer 1 external input)（3）the software and hardware constraints. AT89C2051Due to the foot of the chip AT89C2051, no set limits of external storage inter

36、face, so, for external memory read/write instructions as MOVX etc.Due to 2KB ROM, so, the space to jump instruction should pay attention to the destination address range (transfer 000H - 7FFH), beyond the range of addresses, will not meet wrong results. The scope of data storage is 00H (7FH - when s

37、tack manipulation), also should be noticed.The input signal is simulated by the original P3.6 foot into the microcontroller, so the original P3.6 foot.Unable to external use. Simulation comparator can compare two simulation, if the size of the voltage external A D/A converter and its output as A com

38、parator analog input, and by simulating the comparator another input voltage to be measured, through the introduction of the software method can realize the A/D conversion.8.the Flash memory AT89C2051)Provide a 2KB of single-chip AT89C2051 in Flash memory chips, which allows the online program to mo

39、dify or use special programming programming.(1)Flash memory encryptionAT89C2051 SCM has 2 encryption, can programming (P) or programming (U) to obtain different encryption functionality. Encryption functionality table as shown in table 1-1.Table 1-1LB1LB2Encryption functionalityUUNo encryption funct

40、ionalityPUProhibit to flash to programmingPPProhibit to flash to programming，Also banned programEncrypt a content erased only through chips to erase operation.(2)Flash memory programming and procedures，the piece inside chip AT89C2051 Flash memory programming.Note:1.the counters RESET at an EPROM ins

41、ide the rising 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 programming steps are as follows:1.in the sequence is the VCC GND pin, add working

42、 voltage, XTAL1 pin RESET, receiving GND pin, other than the above time, waiting for 10ms.2.In P3.2 pin RESET, heightening 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 increase the 12V activation programming.6.P3.2 jump to a on

43、e 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 next addresses) in the unit XTAL1 byte programming, a pulse, make address counter add 1, in mouth add program

44、ming data. 9.programming and calibration circuit figure c, d.Figure c programming circuit Figure d calibration circuit Explanation:(1) P3.1 during programming instructions to be low RDY/BSY,(2) single erasing the PROG 10ms need,(3) internal EEPROM address counter on the rising edge RESET, and 000H R

45、ESET to XTAL1 by foot pulses are executed.Along with the rapid development of science and technology, human society has undergone earth-shaking changes. Make our life more colorful. In these changes, the remote control technology has been widely permeates TV, aerospace, military, sports and other pr

46、oduction, all aspects of life. From the broad sense, all equipped with electric locomotive facility or electrical switches, if feel some necessary, can consider to improve existing with remote control device, the operation fixed switch to realize the remote operation of the original equipment, stop,

47、 the variable, etc. Function.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 influence the surrounding environment and does no

48、t interfere with other electric equipment. Due to its cannot penetrate walls, so the room can use common household appliance of remote control without mutual interference, Circuit testing is simple, as long as given circuit connection, generally does not need any commissioning can work, Decoding eas

49、ily, can undertake multiple remote control.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0.620.76um；紫光的波长范围为0.380.46。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0.761.5m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