基于单片机温度监测系统设计的外文翻译(共33页).doc
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1、精选优质文档-倾情为你奉上基于单片机温度监测系统设计的外文翻译专心-专注-专业外文文献资料Distributed Temperature Sensor1.Sensor introduction1.1 Temperature sensor backgroundIn 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.
2、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 fac
3、tors with temperature. Temperature for industrial so important, thus promoting the development of the temperature sensor. 1.2 Temperature sensor developmentMajor general through three sensor development phase: analog integrated temperature sensor. The sensor is taken with silicon semiconductor integ
4、rated 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-consumpt
5、ion 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, LM
6、135, etc.jAnalog 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 TC
7、652/653) 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 sen
8、sor (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, memor
9、y (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 quanti
10、ty, adaptation various micro controller (MCU);1.3 Single point and more temperature sensorThe 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 virtua
11、l 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 foundme
12、nt 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
13、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 tempe
14、rature 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
15、 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 tu
16、be 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 technologies2.1.The system is realizedBy the whole control system for core AT89C5
17、1, 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 LED digital display to come out, and the
18、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 c
19、ycle, also can guarantee the stability of the system. A multipoint connection as shown“1-1”DS1820DS1820DS1820DS1820AT89C51MCUP1.0P1.1P1.2P1.3P3.4Display elementButton control unit1-1 multipoint connection2.2 .AT89C51 Chip introductionAT89C51 is a 4K bytes FLASH Memory (Erasable Programmable and FPER
20、OM - 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 ad
21、opts 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
22、micro controller, AT89C2051 is a streamlined version. AT89C 51microcontroller as many embedded control system .Arrange appearance and pin as shown in figure 1-2 shown1-2 AT89C51 pins figureMajor features: and MCS - 51 compatible 4K bytes programmable FLASH memory life: 1000 write/wipe cycle data ret
23、ention 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 circuitTube feet explains
24、: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 external program data storage, it can be defined as the eigh
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