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基于单片机温度监测系统设计的外文翻译

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2021-02-18 17:09
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2021年2月18日发(作者:creator)


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Distributed Temperature Sensor


introduction


1.1 Temperature sensor background


In the human living environment, temperature playing an extremely important role



No matter where you


live, engaged in any work, ever-present dealt with temperature under. Since the 18th century, industry


since the industrial revolution to whether can master send exhibition has the absolute temperature touch.


In metallurgy, steel, petrochemical, cement, glass, medicine industry and so on, can say almost eighty


percent of industrial departments have to consider the factors with temperature. Temperature for industrial


so important, thus promoting the development of the temperature sensor.



1.2 Temperature sensor development


Major


general


through


three


sensor


development


phase:


analog


integrated


temperature


sensor.


The


sensor is taken with silicon semiconductor integrated workmanship, therefore also called silicon sensor or


monolithic integrated temperature sensor. Such sensing instruments have single function (only measuring


temperature),


temperature


measurement


error


is


smaller,


price


low,


fast


response,


the


transmission


distance,


small


volume,


micro-consumption


electronic


etc,


suitable


for


long


distance


measurement


temperature,


temperature


control,


do


not


need


to


undertake


nonlinear


calibration,


peripheral


circuit


is


simple. It is currently the most common application at home and abroad, an integrated sensor



Typical


products


have


AD590


AD592,


TMP17,


LM135,


g


integrated


temperature


controller.


Analog


integrated temperature controller mainly include temperature control switch, programmable temperature


controller, a typical product have LM56, AD22105 and MAX6509. Some increase strength type integrated


temperature controller (for example TC652/653) also contains the A/D converter and cure good sequence,


this process with the intelligent temperature sensor some similarities. But it is not its system, work by micro


processing device control, this is the main difference between. Intelligent temperature sensor. intelligent



temperature


sensor


(also


called


digital


temperature


degrees


sensor)


is


in


the


mid


1990s


launch.


It


is


microelectronics technology, computer technology and the dynamic testing technology (ATE) crystallization.


Intelligent


temperature


sensor


internal


contain


temperature


sensor,


A/D


converter,


signal


processor,




1




memory (or registers) and interface circuit. Some products still take multiplexer, central control system


device (CPU), random access memory (RAM) and read only memory (ROM). Intelligent temperature sensor


is


characteristic


of


temperature


data


and


relevant


can


output


the


temperature


control


of


the


quantity,


adaptation various micro controller (MCU);


1.3 Single point and more temperature sensor


The


development


trend


of


the


temperature


sensor.


In


the


21st


century,


the


temperature


sensor


is


headed in high precision, multi-function, bus, standardization, high reliability and safety, development of


virtual sensor and network sensor, research monolithic temperature measuring system and other high-tech


direction develop rapidly. Sensors in the application temperature controlling system. Current market exists


mainly


single


point


and


more


two


temperature


measurement.


For


single


point


temperature


foundment


instrument, mainly adopts


the traditional analog integrated


temperature


sensor,


which


heat


resistance,


thermocouple sensors measuring accuracy, high measurement range, and got the general application. This


product


is


temperature


measuring


range




~


200


mostly


between


800



,


resolution


12th,


and


least


distinguishable temperature in 0.001 ~ 0.01 between. Cabin LED display module, shows ranging from 4 to


16. Some instruments also has memory function, can store several hundred to a few thousand sets of data.


This instrument can be very good meet a single user single-point measurement needs. More temperature


measurement,


relative


and


single


point


measurement


precision


has


certain


gap,


although


realized


the


multi-channel temperature measurement and control, but the price is expensive. In view of the present


market


situation,


proposed


this


topic


can


satisfy


requirements,


scalable


and


cost-effective


single-chip


multi-channel temperature measuring system. Through the first temperature sensor DS18B20 acquisition,


and then through the C51 SCM processing and displayed on the digital tube, can be collected indoor or a


greenhouse around in different locations of the temperature, with four digital tube to display. The first


digital pipe display acquisition is which way, which channel. Three digital pipe display after the acquisition


channel by temperature, accurate to 0.1 degrees.



2. The system realized and related technologies


system is realized


By


the


whole


control


system


for


core


AT89C51,


using


four


ways


of


temperature


sensor


DS18B20


in


production


site


for


distribution


area


of


four


different


temperature


measurement


result


with


the


chip


checking, collation store and display, and through the button control, temperature will process after the




2




LED digital display to come out, and the software assurance system anti-interference capacity



four DS1820


connected


to


MCU


respectively,


this


scheme


four


IO


mouth


occupy


MCU


four


IO


though,


but


the


microcontroller


IO


mouth


under


the


condition


of


mouth


not


shortage


by


this


scheme


greatly


simplify


programming


difficulty,


shorten


the


design


cycle,


also


can


guarantee


the


stability


of


the


system.


A


multipoint connection as shown


1-1




DS1820


DS1820


DS1820


DS1820


AT89C51


MCU


P1.0



P1.1



P1.2



P1.3



Display element



Button control unit




1-1 multipoint connection


2.2 .AT89C51 Chip introduction


AT89C51 is a 4K bytes FLASH Memory (Erasable Programmable and FPEROM - FLASH for the campaigns


with) low voltage, high- performance CMOS eight microprocessors, commonly known as the microcontroller.


AT89C2051 is a 2K bytes with flash memory can be erased programmable read-only memory , SCM can


erase


read-only


memory


can


be


repeated


erased


1000


times.


This


device


adopts


ATMEL


high-density


non-volatile


memory


manufacturing


technology


manufacturing,


and


industrial


standard


MCS


-


51


instruction set and output tube compatible. Due to the multifunctional 8 bits CPU and will be flashing on


single chip combination of memory, ATMEL AT89C51 is a kind of high efficient micro controller, AT89C2051


is a streamlined version. AT89C 51microcontroller as many embedded control system .Arrange appearance


and pin as shown in figure




3





1-2 AT89C51 pins figure


Major features:



·



and MCS - 51 compatible


·



4K bytes programmable FLASH memory


·



life: 1000 write/wipe cycle


·



data retention time: 10 years


·



the static job: 0Hz - 24MHz


·



level 3 program memory lock


·



128 x 8 bits internal RAM


·



32 programmable I/O lines


·



two 16 timer


·



5 interrupt source


·



programmable serial channels


·



low power consumption of idle and power lost mode


·



piece inside oscillator and clock circuit



Tube feet explains:


VCC: power supply voltage.


GND: grounded.


P0 Mouth:



P0 mouth a eight leak level two-way I/O mouth open, every foot can absorb


8TTL gate


current. When the pipe mouth P0 feet first write 1, defined as high resistance input. P0 can be used for




4




external program data storage, it can be defined as the eighth data/address. In FIASH programming, P0


mouth as the source- code input port, when FIASH check, the source-code P0 output, when P0 external


must be pulled.


P1 mouth: mouth is an internal P1 provide pull-up resistors 8-bit two-way I/O mouth, P1 mouth buffer


can receive 4TTL gate current output. P1 mouth tube feet, was then write 1 for high, pull up inside can be


used as input, P1 mouth be external pull down for low electricity at ordinary times, will output current, this


is due to internal pull


up sake. In FLASH programming


and calibration, P1 mouth as eighth address to


receive.


P2 mouth: for an internal P2 mouth on the 8-bit pull-up resistors two-way I/O port, P2 mouth to receive,


the


output


buffer


4


TTL


gate


current,


when


P2


mouth


is


written



its


tube


feet


are


internal


pull-up


resistors, and push as input. And so as the input, P2 mouth feet are external down tube, will output current.


This is due to internal pull up sake. P2 mouth when used external program memory or 16 address external


data memory access, P2 mouth high output address eight. In a given address


external 8 address advantage, when for reading and writing data memory, P2 when the special function


registers


mouth output


of


content. P2 mouth in FLASH programming


and


the calibration eight


address


when receiving high signal and control signals.


P3 mouth: P3 mouth pipe is 8 feet with internal pull-up resistors two-way I/O port, may receive four TTL


gate current out put. When P3 mouth writing


input, due to external drop- down for low level, P3 mouth will output current (ILL) this is due to pull up's


sake.


RST: reset input. When oscillator reset device to keep RST feet high level two machine cycle time.


ALE/PROG: when access external storage, address latch allows the output level of the position for latch


address byte. During the FLASH programming, this pin for input programming pulse. In peacetime, the ALE


with a constant frequency cycle output is the pulse signal, the frequencies of the 1/6 oscillator frequency.


So it can be used against external output pulse or used for timing purpose. However it is: whenever used


for external data storage, will skip a ALE pulse. If you want to ban the ALE output can be in SFR8EH address


for 0. At this time, only by performing the ALE MOVX, MOVC instruction is ALE to take effect. In addition,


the pins were slightly up. If microprocessor in external execution ALE, buy a ban is invalid.


/ PSEN: external program memory choice of communication number. By external program memory in


during


the


instruction


fetch,


each


machine


cycle


twice


/PSEN


effective.


But


on


a


visit


to


external


data


storage, the two effective/PSEN signals will not appear.


/


EA/VPP:


when/EA


keep


low


levels


in


this


period,


the


external


program


memory


(0000H


-


FFFFH),


whether have internal program memory. Note encryption method 1, / EA will RESET for internal focus;




5




When/EA end keep high electricity at ordinary times, internal program memory here. During the FLASH


programming, this pin is also used VPP 12V programming power (on).


XTAL1: the inverting oscillator amplifier input and input to the internal clock operating circuit.


XTAL2: from reverse oscillator output.



18B20 Chip introduction


DALLAS


latest



digital


temperature


sensor


DS18B20


profile


new



devices


smaller,


wider


and


voltage applied to the DALLAS semiconductor company more economic DS1820 digital temperature sensor


is the world the first piece of support


economic characteristics, the user can easily form sensor network for measuring system, the construction


of a new concept introduction. DS18B20


also support


°



C ~ + 125


°



C, in - 10 ~


+ 85


°



C range, precision


°



C for + 0.5. Scene in


can greatly improve the system of anti-jamming.


Suitable for the scene in the bad environment temperature measurement, such as: environment control,


equipment or process control, temperature measurement of consumer electronics, etc. And the previous


generation product is different, the new product support 3V ~ 5.5 V voltage range, make the system design


more flexibly and conveniently. But a new generation of products cheaper, smaller. DS18B20 can program


sets 9 ~ 12 resolution, precision


°



C for + 0.5. Optional smaller encapsulation way, more wide voltage


range. Resolution setting, and users set alarm temperature EEPROM, stored in power lost and still save.


DS18B20 performance is the best product of new generation! Performance to price also is very good!


DS18B20 New performance:


(1) data available supply, voltage range: 3.0 ~ 5.5 V;


(2) temperature measuring range: - 55




~ + 125 in - 10 ~ + 85




to + 0.5




when precision;


(3)


programmable


resolution


for


the


9


~


12,


the


corresponding


can


distinguish


respectively



,


the


temperature of 0.5




and 0.125



, by 0.25 0.0625



;


(4) 12 resolution in most 750ms temperature into digital within;


(5) negative pressure characteristics: power at the polarity, thermometers won't because when heating


and burned, but can't work normally.


DS18B20 Appearance and internal structure:




DS18B20 internal structure consists mainly of four parts: 64-bit photolithography ROM, temperature


sensors,


nonvolatile


temperature


alarm


triggers


TH


TL,


configuration


and


registers.


DS18B20


tube


feet




6




arrangement is



1-3


”,



internal structure is



1-4





1-3 DS18B20 tube feet arrangement



(1) DQ for digital signal input/output terminal;


(2) GND for power;


(3) VDD for external power supplies input (in parasitic power connection mode grounding).



1-4 internal structure


3. Debug simulation


s


Proteus is Labeenter electronics company research UK EDA software. Proteus is not only the analog and


digital


circuit,


d/a


hybrid


circuit


design


and


simulation


platform,


but


also


is


currently


the


world's


most


advanced, the most complete various types of micro controller system design and simulation platform. It




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