单片机红外遥控外文翻译.docx

1、单片机红外遥控外文翻译Infrared Remote And Chips Are IntroducedPeoples 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

2、 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.Commo nly used in frared remote con trol syst

3、em of gen eral poi nts tran smit 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 r

4、ather 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

5、 emitting diode and judgment method, using a millimeter to ordinary diode electric block measure of infrared light emitting diode, reverse resista nee. The in frared light emitti ng diode lumin esce nce efficie ncy to use special instrument to measure precise, and use only spare conditions to pull a

6、way from roughly judgment. Receiving part of infrared receiving tube is a photose nsitivediode.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

7、 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 increasehigh-gain ones.the amplifiercircuit.In com mon CX20106A, etc. PC1373H moo n in frared receivi ng special amplifier circ

8、uit. 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 nega

9、tive (GND) and data output (VO or OUT). Infrared receiving head foot arrangement for types varied, manufacturers 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 i

10、n the infrared receivingattention finished first carrier frequency.In frared remote com mon carrier freque ncy for 38kHz, this is tran smitted by using 455kHz Tao Zhe n to decide. At the launch of crystals were in teger freque ncy, freque ncy coefficie nts, so com mon ly 12, so 455kHz 宁 12 hun dredt

11、h 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 t

12、o its cannot pen etratewalls, 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, Decoding easily, can undertake multiple remote control

13、. 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 control is widely used.Multiple infrared remot

14、e 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, selflock ing and in

15、 terlock, data five forms. The pulse output is accordi ng to laun ch whe n the butt on, the receiver output term in als output corresp onding effective, a pulse width 100ms in gen eral. Level refers to the output launch press butt on, the receiver output corresp onding output level , effective trans

16、mit 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 corresp onding static state, such as feet for low, static high for effective, As for the static, low high effective. In most cases, high for effective. Sin

17、ce the lock refers to launch the output of each time you press the butt on, a receiver output 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 f

18、orm for inv 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 ntdif

19、fere 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.

20、 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 introductionof level output is similar.Remote dista nce (Remote Con trol effect of RF Remote Con trol dista nce) are the major fact

21、orsasfollows:l.laun ched in power tran smissi on power: while dista nee, but great power con sumpti on, easy to gen eratenterfere 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.anten

22、na, using linear antenna, and parallel, remote distanee, but occupies a large space, in use the antennaspin, 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

23、 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 theabsorpti on effect eon ductor, radiowav

24、es.Con sideri ng the desig n of hardware volume small to be embedded in the remote control, so we chose 20 foot single-chip chip AT89C2051. Below is the introduction of the function.(1)AT89C2051 internal structure and performaneeAT89C2051 is a byte flash 2K with programmable read-only memory can be

25、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 structio n set and lead. Through the comb in ati on of sin gle chip in gen eral CPL1 and flash memory, is

26、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 saving oper

27、ation mode. The performanee is as follows.5.CUP, 2KB Flash memory,Worki ng voltage range 2.7-6V, 128KB data storage.The static worki ng way: 0-24MHz, 15 root input/output line.A programmable serial, 2 a 16-bit timing/counters.There is a slice of in side precisio nsimulatio n comparator, 5thei nterru

28、pt 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 andfunctionIn order to adapt to the requirement of intelligent instrument, embedded in the chip foot

29、 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.=Diagramb AT89C2051 foot figure.AT89C2051 pin fun ctio n:1.the VCC: voltage.1.to GND.1.P1 mouth: P1 mouth is an 8-bit two-way I/O port. P1.2

30、P1.7 mouth pin the internal resista nee provides. P1.0 and P1.1 requireme nts on the exter nal pull-up resistors. P1.0 and P1.1 also separately as piece in side precisi on simulati on comparator with in put (AIN0) and reversed-phasei nput (AIN1). Output buffer can absorb the P1 mouth 20mA current an

31、d can directly LED display driver. Whe n P1 mouth pin into a 1, can make its in put. Whe n the pin P1.2 P1.7 as in put and exter nal dow n, they will be for the internal resista nee and flow curre nt (IIL). I n flash P1 mouth duri ng the procedure and program code datareceiving calibration.2.P3: the

32、 P3.0 P3.5 P3, P3.7 is the in ternal resista nce with seven twoway 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 internal resista nee can push and in put. As in put, and the low exter nal P3 mouth pin pull-up resistors and will use curre nt (IIL) outflow. P3 mouth still used to impleme nt the various fun etio ns, such as AT89C2051 show n in table P3 mouth still receive some for flash memory programming and ca