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爱吃牛蛙的鱼

已采纳

【1】V.Yu.Teplov,A.V.Anisimov.ThermostattingSystemUsingaSingle-ChipMicrocomputerandThermoelectricModulesBasedonthePeltierEffect[J],2002【2】YeagerBrent.Howtotroubleshootyourelectronicscale[J]..PowderandBulkEngineering.1995【3】MeehanJoanne,MuirLindsey.SCMinMerseysideSMEs:Benefitsandbarriers[J]..TQMJournal.2008看着有用的用吧,单片机很多东西,也不知道你的具体是哪个方面的。

150 评论

北京美克

近年来随着工业的发展,人们对过程控制的精密度和可靠性提出了更多更高的要求,因而液位控制也向着功能齐全,控制灵活,操作简单,控制精度准确的方向发展。液位调节器是生产中应用很广液位测量和控制的设备,所以测量的精确性和控制的准确性是本设备的关键。在研究国内现有传统的液位调节器的基础上,设计的了采用AT89C51单片机为核心,A/D转换器采用ADC0809、D/A转换器采用DAC0832、键盘显示芯片采用74LS165、74LS164。外部数据存储器采用PCF8583;硬件电路包括:温度检测电路、A/D转换电路、D/A转换电路、键盘显示电路、V/I转换电路、电源电路,由这些构成一个单片机液位调节系统。软件包括PID控制算法、液位控制。本系统把单片机应用于液位测量控制中,既提高了产品的功能和质量,又降低了成本。本系统还具有结构先进合理、功能完善、满足控制精度的要求、抗干扰能力强、较高的灵活性和可靠性、通用性好、价格低,使用方便等特点。Withindustrialdevelopmentinrecentyears,processcontrolforprecisionandreliabilityofmorehigherrequirements,andalsotowardtheliquidlevelcontrolfunctions,controlofaflexible,simpleoperation,precisecontrolprecisiondirection.Liquidlevelregulatorisaverywideapplicationoftheproductionofliquidlevelmeasurementandcontrolequipment,sotheaccuracyofmeasurementandcontrolaccuracyisthekeytotheequipment. AvailableinthetraditionalliquidlevelregulatoronthebasisofthedesignusingAT89C51single-chipmicrocomputerasthecore,A/DconverterusingADC0809,D/AconvertersusedDAC0832,keyboarddisplaychip74LS165,74LS164.TheuseofexternaldatamemoryPCF8583;hardwarecircuitincluding:temperaturedetectioncircuit,A/Dconversioncircuit,D/Aconvertercircuit,akeyboarddisplaycircuit,V/Iconversioncircuit,powercircuit,andtheseconstituteasingle-chiplevel-conditioningsystems.Software,includingPIDcontrolalgorithm,levelcontrol. Thesystemappliestothesingle-chipcontrolofliquidlevelmeasurement,notonlytoenhancetheproduct'sfeaturesandquality,andreducedcosts.Thesystemalsohasadvancedandreasonablestructure,functionandmeettherequirementsofcontrolprecision,stronganti-interferenceability,highflexibilityandreliability,versatility,andlowprices,easytouseandsoon.

158 评论

三石太保

文献1:This project aimed to develop a wireless system to detect and allow only the authorized persons. The system was based on Radio Frequency Identification (RFID) technology and consists of a passive RFID tag. The passive micro transponder tag collects power from the 125 KHz magnetic field generated by the base station, gathers information about the Tag ID and sends this information to the base station. The base station receives, decodes and checks the information available in its Database and Manchester code was used to send those information. The system performed as desired with a 10cm diameter antenna attached to the transponder. The Base Station is built by using the Popular 8051 family Microcontroller. It gets the tag ID and if the tag ID is stored in its memory then the microcontroller will allow the person inside. RFID Reader Module, are also called as interrogators. They convert radio waves returned from the RFID tag into a form that can be passed on to Controllers, which can make use of it. RFID tags and readers have to be tuned to the same frequency in order to communicate. RFID systems use many different frequencies, but the most common and widely used Reader frequency is 125 KHz.全部内容及下载地址:文献2: Choose controller according to your requirements of program memory(flash), RAM, ADC, EEPROM. 16kB of flash is sufficient to implement floodfill algorithm. If you are thinking of implementing floodfill algorithm then 256 bytes are required to store Map of the maze and 512 bytes are required for processing so you need atleast 1kBRAM to implement floodfill. ATmega16,32 and PIC18f452 are some controllerspopularly used in micromouse. If you are thinking of building just a wall follower then simple 8051 based controller likeAT89s52 can also be used. Stepper driving:Please read a step by step stepper motor guidefirst. There are two types of motors a) unipolar b) bipolar. Unipolar stepper motors can be used as bipolar steppers so prefer unipolar whilepurchasing stepper. You can use simple ULN2803 IC the circuit can be found in 8051 microcontroller by Mazidi. ULN2803 has eight darlington pair in a single package. It hascurrent carrying capacity of 500mA. so it will get heated up frequently will get damaged.So two ULN2803 can be connected in parallel to fix the problem but this is a chalta haiway of driving stepper. 全部见: 文献3:Stepper Motor Advantagesand DisadvantagesAdvantages1. The rotation angle of the motor isproportional to the input pulse.2. The motor has full torque at stand-still (if the windings are energized)3. Precise positioning and repeat-ability of movement since goodstepper motors have an accuracy of3 – 5% of a step and this error isnon cumulative from one step tothe next.4. Excellent response to starting/stopping/reversing.5. Very reliable since there are no con-tact brushes in the motor.Therefore the life of the motor issimply dependant on the life of thebearing.6. The motors response to digitalinput pulses provides open-loopcontrol, making the motor simplerand less costly to control.7. It is possible to achieve very lowspeed synchronous rotation with aload that is directly coupled to theshaft.8. A wide range of rotational speedscan be realized as the speed isproportional to the frequency全文见:

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