介紹一種無極可調(diào)交流電子負(fù)載設(shè)計的新方法，由ATmega48單片機輸出PWM波，通過上位機設(shè)定不同的占空比控制場效應(yīng)管的通斷時間，即改變流過場效應(yīng)管的平均電流。根據(jù)電流的大小，可以等效為相應(yīng)的負(fù)載，并將采集的電流值顯示在上位機上。文中對該系統(tǒng)的軟﹑硬件設(shè)計思路作了詳細(xì)的分析，闡述了其設(shè)計原理。 Abstract: A new type electronic load is introduced.Due to ATmega48 microcomputer output PWM wave.The different duty is set ratio through PC to control FET turn-on time.We can equivalent homologous load according the current and display the current at PC.The hardware and software designing are analysed in detail. The principle is explained and the output is also given.
上傳時間： 2013-11-23
上傳用戶：蟲蟲蟲蟲蟲蟲
針對材料試驗機等設(shè)備中要求測量或控制材料拉伸或壓縮的位移，一般采用光電軸角編碼器檢測位置信號，輸出正交編碼脈沖信號。若采用其他方法檢測位置信號，必然導(dǎo)致電路設(shè)計復(fù)雜，可靠性降低。因此，提出一種基于LS7266R1的電子式萬能材料試驗機設(shè)計方案。給出了試驗機中的控制器工作原理，LS7266R1與單片機的接口硬件設(shè)計，以及主程序軟件流程圖。巧妙地把力量傳感器，位移傳感器等機械運動狀態(tài)的壓力或拉力以及位置坐標(biāo)，變成了電壓信號和電脈沖數(shù)字信號，供A/D測量和LS7266R1計數(shù)，從而實現(xiàn)了獨立完成材料試驗控制或通過PC機串口命令完成材料試驗控制。 Abstract: Aiming at the requirement that the displacement of the tension and compression always be tested and controlled in the equipement such as material testing machine. The position signal was tested by photoelectric axial angle coder. Therefore， the paper proposes the design of electronic universal testing machine design based on LS7266R1. If the position signal detected by other methods， will inevitably lead to the circuit design complexity， reliability decreased. The work theory of the controller， the hardware interface design between LS7266R1 and single chip， and the flow chart of main program， are presented in this paper. The signal of the compression or tension power and displacement at working， which tested by power sensor and displacement sensor especially， is changed into electric voltage and electric pulse numerical signals. And these signals can be tested by A/D and counted by LS7266R1. Finally the test of the material properties can be controlled by itself， or controlled by the COM command of PC.
上傳時間： 2013-11-02
上傳用戶：yl1140vista
介紹一種基于單片機的多路溫度采集及監(jiān)控系統(tǒng)，能夠測量6路溫度信號，具有計算機聯(lián)網(wǎng)功能，各測量點可以單獨監(jiān)控和設(shè)置，可根據(jù)用戶的需求自動控制。測量溫度范圍為-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。 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)
上傳時間： 2013-10-23
上傳用戶：bjgaofei
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)動器芯片
上傳時間： 2013-11-08
上傳用戶：laozhanshi111
介紹了一種基于MSP430系列單片機和ADXL203加速度傳感器的數(shù)字式傾角儀，它不僅可以實現(xiàn)水平度檢測，而且可以測量00～3600范圍內(nèi)的任意傾角，分辨率可達O．1。。此外，由于該傾角儀輸出為數(shù)字結(jié)果，因此它也可以與其他的數(shù)字設(shè)備結(jié)合起來，組合成一個功能更加強大的儀器。該數(shù)字傾角儀可廣泛應(yīng)用于建筑、機械、道路、橋梁、石油、煤礦和地質(zhì)勘探等各種需要測量重力參考系下傾角的場合。關(guān)鍵詞：MSP430F133單片機；力敏傳感器；ADXL203加速度計；角度測量 Abstract：This paper presents a new style digital inclinometer which is developed on the basis of the MSP430F133 MCU and the ADXL203 dual axis aeeelerometer．This inclinometer not only can test levelness，but also can measure any angle between 0。and 360。with an accuracy of 0．1 O．In addition，its output is a digital result，which makes it possible to integrate itself with other digital devices to form a more functional unit．This inclinometer can be widely used in any construction site，oil field，coal-mine or geologic survey and SO on where it will provide the working people with convenience to measure any angles．Key words：MSP430F133 MCU；force sensor；ADXL203 accelerometer；angle measurement
上傳時間： 2013-11-14
上傳用戶：lizhizheng88
要搞清楚單片機與PLC的異同，首先得明確什幺是單片機，什幺是PLC。對此，我們簡要回顧一下計算機的發(fā)展歷程也許有幫助，按計算機專家的原始定義，計算機系統(tǒng)由五大部分--即控制單元（CU）、算術(shù)運算單元（ALU）、存儲器（Memory）、輸入設(shè)備（Input）、輸出設(shè)備（Output）組成。早期計算機（晶體管的或集成電路的，不包括電子管的）的CU或ALU由一塊甚至多塊電路板組成，CU和ALU是分離的，隨著集成度的提高，CU和ALU合在一塊就組成了中央處理單元（CPU）,接著將CPU集成到單塊集成電路中就產(chǎn)生MPU或MCU,出現(xiàn)了如Intel4004、8008、8080，8085、8086、8088、Z80等MPU。此后，MPU的發(fā)展產(chǎn)生了兩條分支，一支往高性能、高速度、大容量方向發(fā)展，典型芯片如：Intel80186、286、386、486、586、P2、P3、P4等，速度從4.7MHz到現(xiàn)在的3.2GHz。另一支則往多功能方向發(fā)展，將存儲器(ROM、PROM、EPROM、EEPROM、FLASHROM、SRAM等)、輸入/出接口（Timer/Counter、PWM、ADC/DAC、UART、IIC、SPI、RTC、PCA、FPGA等）全部集成在一塊集成電路中而成為SOC。依愚之見，這就是當(dāng)今廣泛應(yīng)用的單片計算機，簡稱單片機。這一分支可謂品種繁多，位寬從8位到32位，引腳數(shù)從6個到幾百個，工作頻率從幾十KHz到幾百MHz,體系結(jié)構(gòu)既有CISC也有RISC,數(shù)不勝數(shù)。常用的有MCS-51系列、MCS-96系列、PIC系列、AVR系列、ARM7/9系列、TMS320系列、MSP430系列、MOTOROLA眾多的單片機等等。
上傳時間： 2013-10-16
上傳用戶：jjj0202
FEATURES400 MSPS internal clock speedIntegrated 10-bit DAC32-bit tuning wordPhase noise ≤ –120 dBc/Hz @ 1 kHz offset (DAC output)Excellent dynamic performance>75 dB SFDR @ 160 MHz (±100 kHz offset) AOUTSerial I/O control1.8 V power supplySoftware and hardware controlled power-down48-lead TQFP/EP packageSupport for 5 V input levels on most digital inputsPLL REFCLK multiplier (4× to 20×)Internal oscillator; can be driven by a single crystalPhase modulation capabilityMultichip synchronization
上傳時間： 2014-12-04
上傳用戶：axin881314
The PCA9536 is an 8-pin CMOS device that provides 4 bits of General Purpose parallel Input/Output (GPIO) expansion for I2C-bus/SMBus applications and was developed to enhance the NXP Semiconductors family of I2C-bus I/O expanders. I/O expanders provide a simple solution when additional I/O is needed for ACPI power switches, sensors, push buttons, LEDs, fans, etc.
上傳時間： 2013-10-27
上傳用戶：w230825hy
The PCA9534 is a 16-pin CMOS device that provide 8 bits of General Purpose parallel Input/Output (GPIO) expansion for I2C-bus/SMBus applications and was developed to enhance the NXP Semiconductors family of I2C-bus I/O expanders. The improvements include higher drive capability, 5 V I/O tolerance, lower supply current, individual I/O configuration, 400 kHz clock frequency, and smaller packaging. I/O expanders provide a simple solution when additional I/O is needed for ACPI power switches, sensors, push buttons, LEDs, fans, etc.
上傳時間： 2013-11-17
上傳用戶：vodssv
The CAT28LV64 is a low voltage, low power, CMOS Parallel EEPROM organized as 8K x 8−bits. It requires a simple interface for in−system programming. On−chip address and data latches, self−timed write cycle with auto−clear and VCC power up/down write protection eliminate additional timing and protection hardware. DATA Polling and Toggle status bit signal the start and end of the self−timed write cycle. Additionally, the CAT28LV64 features hardware and software write protection.
上傳時間： 2013-11-16
上傳用戶：浩子GG
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