sudden单片机红外遥控外文翻译

2021年1月21日发(作者：独立基础)

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.
Commo nly used in frared remote con trol system 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 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 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 away 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 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 amplifiercircuit.
In com mon CX20106A, etc. PC1373H moo n in frared receivi ng 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
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 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 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.
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 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, selflock ing and
in terlock, data five forms.
the receiver output term in als output corresp onding
gen eral.
onding output level



output corresp onding static state, such as feet for low, static
for the static,
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 form for
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.

to represe ntdiffere nt keystroke.
Normally, the receiver except a few data output, but also a
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
and
each hair, the receiver output corresponding

Remote dista nce (Remote Con trol effect of RF Remote Con trol dista nce) are the major
factorsasfollows:
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.

antenna, 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 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, radiowaves.
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 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
structio n 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 saving operation mode. The performanee is as follows.
5.

CUP, 2KB Flash memory,
Worki ng voltage range 2.7-6V, 128KB data static worki ng way: 0-24MHz,
15 root input/output line.
A programmable serial, 2 a 16-bit timing/ is a slice of in side
precisio nsimulatio n comparator, 5thei nterrupt 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 andfunction
In order to adapt to the requirement of intelligent instrument, 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.=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 ~ 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 and can directly LED display driver. Whe n P1 mouth pin into a
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 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
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 calibration of program con trol
sig nals.
5.

RST: reset in put. RST once, all into high level I/O foot will reset to
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 inv erse internal clock gen eratori
nput.
7.

XTAL2: as the oscillator reversed-phase the amplifier's output.P3 mouth function
as isshown in table 1.
Table 1
P3 mouth pin
P3.0
P3.1
P3.2
Fun cti on
RXD(Serial in put)
TXD(Serial output port)
INT0(External interruption 0)


P3.3
P3.4
P3.5
INT1(External interruption 1)
TO(The timer 0 exter nal in put)
T1(The timer 1 exter nal i nput)
(3)

the software and hardware constraintsAT89C2051
Due to the foot of the chip AT89C2051, no set limits of external storage in terface,
so, for exter nal memory read/write in structio ns 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 OOH (7FH --whe n stack man ipulatio n),
alsoshould be no ticed.
The in put sig nal is simulated by the origi nal P3.6 foot into the microcontroller,
sothe 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 simulat ing the comparator ano ther in put voltage to be measured, through the
introduction 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)

Flash memory en crypti on
AT89C2051
SCM
has
2
encryption,
can
programming
(P)
or
programming
(U)
to
obtain
different encryption functionality. Encryption functionality table asshown in table 1-1.
Table1-1
LB1
U
P
P
LB2
U
U
P
En crypti on fun ctio nality
No en crypti on function ality
Prohibit to flash to program ming
Prohibit to flash to
programming
.
Also banned program


En crypt a conten terased only through chips to eraseoperatio n.
(2)

Flash
memory
program
ming
and
procedures
the
piece
in
side
chip
AT89C2051
Flash
memory program ming.
Note:
cou nters RESET at an EPROM in side the risi ng edge, and 000H
RESET to XTAL1 by foot is executed,pulse count.
2.

piecesof 10ms to erasePROG pulse.
3.

duri ng the programmi ng P3.1 pulled low RDY/BSY in structio ns.
⑶
A
T89C2051 SCM in Flash memory chips program ming steps are as follows:
the seque nee is the VCC GND pin, add worki ng voltage, XTAL1 pin RESET,
receiving GND pin, other than the abovetime, waiting for 10ms.
P3.2 pin RESET,heighte ning level.
P3.3, P3.4, P3.5, P3.7 pinjadd model multilevel.
4.

P1.0 P1.7 -- for the 000H un itadd data bytes.
5.

RESET to increasethe 12V activation programming.
6.

P3.2 jump to a one byte programming or encryption.
7.

calibration has been programming, data from 12V to RESET logic level
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 counter add 1, in mouth add programming data.
9.

programming and calibration circuit figure c, c programming circuit
Figure d calibration circuit Explanation:
(1)

P3.1 during programming instructionsto below RDY/BSY,
(2)

single erasingthe 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 permeatesTV, aerospace,military, sports and