針對(duì)目前采用的熱敏電阻測(cè)量方法，提出了采用單總線數(shù)字式溫度傳感器DS18B20和單片機(jī)組成的新型溫度測(cè)量?jī)x。介紹DS18B20的結(jié)構(gòu)和工作原理，以及單總線工作原理，給出了由Mega8單片機(jī)和DS18B20構(gòu)成的單總線溫度測(cè)量?jī)x的硬件電路及軟件流程圖。經(jīng)試驗(yàn)基于單總線器件DS18B20的溫度測(cè)量?jī)x，具有測(cè)量準(zhǔn)確、測(cè)溫范圍寬、體積小、控制方便等優(yōu)點(diǎn)。 Abstract: This paper brings forward a new temperature meter composed of 1-Wire temperature sensor DS18B20 and MCU which has advantage of the thermistor. In the article, the DS18B20＇s structure and controlling principles are introduced and hardware circuit and software diagram of the temperature meter are given.After been tested,the temperature meter has the advantages of accurate measurement, wide temperature range, small volume and convenient controlling.
上傳時(shí)間： 2013-10-31
上傳用戶：hzy5825468
介紹一種以MSP430單片機(jī)為基礎(chǔ)的智能頻率測(cè)量系統(tǒng)，采用硬件邏輯與軟件指令相結(jié)合的方式控制閘門(mén)，實(shí)現(xiàn)0 MHz~10 MHz范圍內(nèi)無(wú)檔切換的等精度測(cè)量。 Abstract: An intelligent frequency measurement system based on MSP430 singlechip is introduced. The system uses a way that can combine hardware logic and software instructions to contronl the strobe ,and completes the functions of equal precision in the range of 0MHz~10MHz without shifting
上傳時(shí)間： 2013-10-28
上傳用戶：dbs012280
介紹一種基于單片機(jī)的多路溫度采集及監(jiān)控系統(tǒng)，能夠測(cè)量6路溫度信號(hào)，具有計(jì)算機(jī)聯(lián)網(wǎng)功能，各測(cè)量點(diǎn)可以單獨(dú)監(jiān)控和設(shè)置，可根據(jù)用戶的需求自動(dòng)控制。測(cè)量溫度范圍為-10 ℃～200 ℃，控制方式采用模擬量調(diào)壓模式。該系統(tǒng)具有控制精度高、沖擊小等特點(diǎn)。 Abstract: A temperature collecting and surveillance-controlling system based on sing-chip microcomputer is introduced. It can measure 6 channel signal of the temperature,and it has a function of network connection.The temperature measure points can be monitored and located, it can be controlled automatic according to user’s demand.The temperature range is -10℃ to 200℃.The model of control is adjustable voltage with simulation. It features high precision and little impact.
標(biāo)簽： 多路 溫度采集 監(jiān)控系統(tǒng)
上傳時(shí)間： 2013-10-23
上傳用戶：bjgaofei
為解決輸油管道溫度壓力參數(shù)實(shí)時(shí)監(jiān)測(cè)的問(wèn)題，設(shè)計(jì)了以C8051F930單片機(jī)作為控制核心的超低功耗輸油管道溫度壓力遠(yuǎn)程監(jiān)測(cè)系統(tǒng)。現(xiàn)場(chǎng)儀表使用高精度電橋采集數(shù)據(jù)，通過(guò)433 MHz短距離無(wú)線通信網(wǎng)絡(luò)與遠(yuǎn)程終端RTU進(jìn)行通信，RTU通過(guò)GPRS網(wǎng)絡(luò)與PC上位機(jī)進(jìn)行遠(yuǎn)程數(shù)據(jù)傳輸，在上位機(jī)中實(shí)現(xiàn)數(shù)據(jù)存儲(chǔ)和圖形化界面顯示，從而實(shí)現(xiàn)輸油管道溫度壓力參數(shù)的實(shí)時(shí)監(jiān)測(cè)和異常報(bào)警。經(jīng)實(shí)驗(yàn)證明，該系統(tǒng)的12位數(shù)據(jù)采集精度滿足設(shè)計(jì)要求，漏碼率小于1%，正常工作時(shí)間超過(guò)5個(gè)月，能實(shí)時(shí)有效地監(jiān)測(cè)輸油管道的溫度壓力參數(shù)，節(jié)省大量人工成本，有效預(yù)防管道參數(shù)異常造成的經(jīng)濟(jì)損失和環(huán)境污染。 Abstract: In order to solve the problems on real-time monitoring of pipeline temperature and pressure parameters， the ultra-low power remote pipeline temperature and pressure monitoring system was designed by using the single chip processor C8051F930 as the control core. The high-precision electric bridge was used in field instruments for data collection， the 433MHz short-range wireless communication network was used to make communication between field instrument and RTU， the GPRS was used by the RTU to transmit data to the PC host computer， and the data was stored and displayed in the PC host computer， so the real-time monitoring and exception alerts of pipeline temperature and pressure parameters were achieved. The experiment proves that the system of which error rate is less than 1% over five months working with the 12-bit data acquisition accuracy can effectively monitor the pipeline temperature and pressure parameters in real time， it saves a lot of labor costs and effectively prevents environmental pollution and economic losses caused by abnormal channel parameters.
標(biāo)簽： C8051F930 溫度 壓力 遠(yuǎn)程監(jiān)測(cè)系統(tǒng)
上傳時(shí)間： 2013-11-07
上傳用戶：cuibaigao
1 FEATURES· Single chip LCD controller/driver· 1 or 2-line display of up to 24 characters per line, or2 or 4 lines of up to 12 characters per line· 5 ′ 7 character format plus cursor; 5 ′ 8 for kana(Japanese syllabary) and user defined symbols· On-chip:– generation of LCD supply voltage (external supplyalso possible)– generation of intermediate LCD bias voltages– oscillator requires no external components (externalclock also possible)· Display data RAM: 80 characters· Character generator ROM: 240 characters· Character generator RAM: 16 characters· 4 or 8-bit parallel bus or 2-wire I2C-bus interface· CMOS/TTL compatible· 32 row, 60 column outputs· MUX rates 1 : 32 and 1 : 16· Uses common 11 code instruction set· Logic supply voltage range, VDD - VSS: 2.5 to 6 V· Display supply voltage range, VDD - VLCD: 3.5 to 9 V· Low power consumption· I2C-bus address: 011101 SA0.
標(biāo)簽： 2116 PCF LCD 驅(qū)動(dòng)器芯片
上傳時(shí)間： 2013-11-08
上傳用戶：laozhanshi111
The SN65LBC170 and SN75LBC170 aremonolithic integrated circuits designed forbidirectional data communication on multipointbus-transmission lines. Potential applicationsinclude serial or parallel data transmission, cabledperipheral buses with twin axial, ribbon, ortwisted-pair cabling. These devices are suitablefor FAST-20 SCSI and can transmit or receivedata pulses as short as 25 ns, with skew lessthan 3 ns.These devices combine three 3-state differentialline drivers and three differential input linereceivers, all of which operate from a single 5-Vpower supply.The driver differential outputs and the receiverdifferential inputs are connected internally to formthree differential input/output (I/O) bus ports thatare designed to offer minimum loading to the buswhenever the driver is disabled or VCC = 0. Theseports feature a wide common-mode voltage rangemaking the device suitable for party-lineapplications over long cable runs.
上傳時(shí)間： 2013-10-13
上傳用戶：ytulpx
FeaturesThe following standard features are provided.• Choice of RTOS scheduling policy1. Pre-emptive:Always runs the highest available task. Tasks of identical priorityshare CPU time (fully pre-emptive with round robin time slicing).2. Cooperative:Context switches only occur if a task blocks, or explicitly callstaskYIELD().• Co-routines (light weight tasks that utilise very little RAM).• Message queues• Semaphores [via macros]• Trace visualisation ability (requires more RAM)• Majority of source code common to all supported development tools• Wide range of ports and examples
上傳時(shí)間： 2013-10-13
上傳用戶：13162218709
The Controller Area Network (CAN) is a serial, asynchronous, multi-master communication protocol forconnecting electronic control modules, sensors and actuators in automotive and industrial applications.With the SJA1000, Philips Semiconductors provides a stand-alone CAN controller which is more than a simpleeplacement of the PCA82C200.Attractive features are implemented for a wide range of applications, supporting system optimization, diagnosisand maintenance.
標(biāo)簽： Stand-alone contro 1000 SJA
上傳時(shí)間： 2013-11-18
上傳用戶：yxgi5
The P82B715 I2C Buffer was designed toextend the range of the local I2C bus out to50 Meters. This application note describesthe results of testing the buffer on severaldifferent types of cables to determine themaximum operating distances possible. Theresults are summarized in a table for easyreference.
標(biāo)簽： extender P82B715 Using I2C
上傳時(shí)間： 2014-12-28
上傳用戶：lou45566
狀態(tài)機(jī)設(shè)計(jì):8.1.1 數(shù)據(jù)類型定義語(yǔ)句TYPE語(yǔ)句的用法如下：TYPE 數(shù)據(jù)類型名IS 數(shù)據(jù)類型定義OF 基本數(shù)據(jù)類型;或TYPE 數(shù)據(jù)類型名IS 數(shù)據(jù)類型定義;TYPE st1 IS ARRAY ( 0 TO 15 ) OF STD_LOGIC ;TYPE week IS (sun，mon，tue，wed，thu，fri，sat) ; 8.1.1 數(shù)據(jù)類型定義語(yǔ)句TYPE m_state IS ( st0，st1，st2，st3，st4，st5 ) ;SIGNAL present_state，next_state : m_state ;TYPE BOOLEAN IS (FALSE，TRUE) ；TYPE my_logic IS ( '1' ，'Z' ，'U' ，'0' ) ;SIGNAL s1 : my_logic ;s1 <= 'Z' ;SUBTYPE 子類型名IS 基本數(shù)據(jù)類型RANGE 約束范圍;SUBTYPE digits IS INTEGER RANGE 0 to 9 ;
標(biāo)簽： 狀態(tài)
上傳時(shí)間： 2013-11-05
上傳用戶：nem567397
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