基于单片机的自动调温风扇系统设计 -外文翻译.doc
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1、本科毕业设计 (外文翻译)题 目 基于单片机的自动调 温风扇系统设计 姓 名 丁蒙恩 专 业 电子科学与技术 学 号 200931003 指导教师 张 军 郑州科技学院电气工程学院 二一三年五月外文翻译外文翻译原文:System design based on single chip microcomputer automatic temperature adjustment fan Temperature control fan in the modern social production and Peoples Daily life have a wide range of applic
2、ations, such as industrial production and large mechanical cooling fan in the system, now widely used on laptops smart CPU fan, etc. Design based on single chip microcomputer temperature control fan system, this paper adopts the single chip microcomputer as controller, using temperature sensor DS18B
3、20 as temperature gathering element, and according to the collected temperature through a darlington reverse drive driven ULN2803 fan motor. According to the detected temperature was compared with the system set the temperature of the implementation of the fan motor start and stop automatically, and
4、 can root temperature changes automatically changes the speed of the fan motor, at the same time with eight digital tube LED display temperature and setting temperature is detected.I. IntroductionWith the wide application of microcontroller in various fields, many of the temperature control system u
5、sing single chip microcomputer as control also arises at the historic moment, such as system based on single chip microcomputer temperature control fan. It makes the fan according to the change of environmental temperature automatic start-stop, the fan speed changes with the change of environmental
6、temperature, fan intelligent control is realized. Its design for the modern society has brought many convenient peoples life and production, to improve peoples quality of life, the production efficiency but also can save the energy for the fan operation. This paper was designed by the ATMEL company
7、8052 series single-chip computer AT89C52 as the controller, the temperature sensor by DALLAS company DS18B20 as temperature gathering element, and through a darlington reverse drive the rotation of the fan motor driven ULN2803. At the same time, make the system detected ambient temperature as well a
8、s the system default temperature dynamic display on LED digital tube. According to the system detects the ambient temperature and the comparison of the preset temperature, realize automatic start-stop of the fan motor and speed automatic adjustment. II. System Overall Structure Design Is the overall
9、 train of thought of this design: using temperature sensor DS18B20 testing environment temperature and directly output digital signals to single chip microcomputer AT89C52, on the LED digital tube display the current environment temperature and the preset temperature. The preset temperature can form
10、 as an integer, detects the current environment temperature can be accurate to one decimal place. At the same time adopts the PWM pulse width modulation method to change the dc fan motor speed. And through the two buttons to change the default value, a preset temperature, another reduce the preset t
11、emperature. III. the unit modules hardware design System mainly includes device DS18B20 temperature sensor, and AT89C52 single-chip microcomputer and five LED digital tube, fan Yin reverse drive dc motor, darlington ULN2803. Auxiliary components include resistors capacitors, crystal vibration, power
12、 supplies, buttons, dial the code switch, etc.3.1 part of the system devices A.DS18B20 single line digital temperature sensor DS18B20 digital temperature sensor, is using the American DALLAS semiconductor company production of DS18B20 digital temperature sensor networking chip packaging, it has the
13、miniaturization, low power consumption, high performance, strong anti-interference ability, easy to match advantage such as microprocessors, temperature can be directly converted to a serial digital signal processor for processing. The main characteristic of DS18B20: measuring results directly in th
14、e form of a digital signal output, with 1-wire bus means serial port sent to the CPU, can send CRC check code at the same time, with strong ability of anti-interference error correction; Temperature measurement range between - 55 + 125 , at - 10 + 85 accuracy of plus or minus 0.5 ; Detects the tempe
15、rature resolution for 9 12, corresponding distinguished temperature 0.5 , respectively, 0.25 , 0.125 and 0.0625 , which can realize high precision temperature measurement; The uniqueness of the single wire interface, it makes only a port when it is connected with the microprocessor line can be reali
16、zed with the two-way communication of the microprocessor; Support more network function, that is, multiple DS18B20 can be parallel on only three lines, achieve network function of multipoint temperature measurement; Wide working voltage range, the range from 3.0 V to 5.5 V. DS18B20 internal structur
17、e mainly has four parts: a 64 - bit ROM, the temperature of the temperature sensors, nonvolatile alarm trigger TH and TL, the configuration register. The pin has three, the DQ for digital signal, GND for power supply, VDD power input end. B.Introduction to the AT89C52 single chip microcomputer Is on
18、e of the 51 series single chip microcomputer AT89C52 model, it is produced by the ATMEL company a low voltage, high-performance 8-bit microcontroller, on chip device adopts nonvolatile of ATMEL company, high-density storage technology production, compatible with standard of MCS - 51 command system,
19、at the same time with general 8-bit CPU and 8 k bytes can be repeatedly wipe read-only program memory RAM, ROM and 256 gigabytes of data memory in many, many more complex control system is AT89C52 single chip microcomputer has been widely used. AT89C52 40 pin. 3.2 part of the circuit design A.Switch
20、 is reset and crystal oscillator circuit In microcomputer application system, in addition to the microcontroller itself needs to be reset, external expansion I/O interface circuit also need to be reset, so you need a system, including electricity and button to reset synchronous reset circuit. Single
21、-chip microcomputer XTAL1 and XTAL2 for external quartz crystal and fine-tuning capacitor, which used to connect the MCU chip OSC time feedback loop. This switch is reset and crystal oscillator circuit in the design of as shown in the figure below, when press the button switch S1, system reset at a
22、time. For 20 pf capacitor C1, C2, C3 is 10 uf, the 10 k resistor R2, and R3, crystals of 11.0592 MHz. B.Temperature acquisition circuit DS18B20 digital temperature sensor by counting its internal clock cycles to effect, achieve the function of peculiar temperature measurement. Low temperature coeffi
23、cient of the clock oscillator output signal generated by high temperature coefficient of oscillators door was counting cycles, and counter with advance and 55 corresponding weights of a base. If counter count to zero, the high temperature coefficient of oscillation period is not over, said the measu
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