Precision 16-bit analog outputs with softwareconfigurableoutput ranges are often needed in industrialprocess control equipment, analytical and scientificinstruments and automatic test equipment. In the past,designing a universal output module was a daunting taskand the cost and PCB real estate associated with thisfunction were problematic, if not prohibitive.
上傳時(shí)間： 2014-12-23
上傳用戶(hù)：如果你也聽(tīng)說(shuō)
Abstract: A resistive feedback network is often used to set the output voltage of a power supply. A mechanical potentiometer (pot)conveniently solves the problem of adjusting a power supply. For easier automatic calibration, a mechanical pot can be replaced witha digital pot. This application note presents a calibration solution that uses a digital pot, because digipots are smaller, do not movewith age or vibration, and can be recalibrated remotely. This proposed solution reduces the susceptibility of the system to thetolerance of the digital pot's end-to-end resistance, making the solution optimal fordesigners. This application note also explainssome of the equations required to calculate the resistor chain values and to use a digital pot in this way. A spreadsheet withstandard reisistor values is available for easy calculations.
標(biāo)簽： 電源供應(yīng)器 數(shù)字電位器 應(yīng)用筆記 校準(zhǔn)
上傳時(shí)間： 2013-10-31
上傳用戶(hù)：caiguoqing
針對(duì)煤礦井下調(diào)度及緊急救援系統(tǒng)的需求，以DTMF編解碼模塊為核心，設(shè)計(jì)了具有自動(dòng)撥號(hào)功能的新型電話(huà)系統(tǒng)。該系統(tǒng)利用MT8880對(duì)DTMF信號(hào)的編解碼功能實(shí)現(xiàn)一鍵撥號(hào)和遠(yuǎn)程設(shè)置，通過(guò)檢測(cè)振鈴和忙音信號(hào)，完成自動(dòng)摘機(jī)和掛機(jī)過(guò)程，配合AGC等外圍電路達(dá)到話(huà)音清晰流暢的效果。 Abstract: To meet the demand for mine scheduling and emergency rescue system， with using DTMF signal codec as the core， a new telephone system was designed with automatic dialing function. In the system， the DTMF signal encoding and decoding function of MT8880 was used to achieve one-touch dialing and remote setting. The circuit detects the ringing and busy signal， and then completes automatic off-hook and hangup. With AGC(automatic Gain Control) and other peripheral circuits， the voice was regulated to a clear and smooth effect.
標(biāo)簽： 8880 MT 撥號(hào)電話(huà) 系統(tǒng)設(shè)計(jì)
上傳時(shí)間： 2014-11-18
上傳用戶(hù)：ly1994
介紹了電力操作電源與智能電池巡檢系統(tǒng)的特點(diǎn)，給出了一種基于超低功耗單片機(jī)MSP430 F149針對(duì)中小型變電站自動(dòng)化運(yùn)行的專(zhuān)用設(shè)備的基本設(shè)計(jì)原理及實(shí)現(xiàn)方法，最后給出了詳細(xì)硬件構(gòu)成和軟件實(shí)現(xiàn)。該系統(tǒng)能滿(mǎn)足中小型變電站安全、可靠、自動(dòng)運(yùn)行的要求，并通過(guò)與上位機(jī)的串行通信實(shí)現(xiàn)變電站的遠(yuǎn)程管理和控制。 Abstract: The characters of the intelligent battery data logging system of the electric operation power are introduced.The basic design principle and the implemented methods of the special equipment which only designed for the middle or small transformer substation based on MSP430F149 are prescribed. Finally, the hardware block diagram and the software flow chart are also given. The function that the system finally needs to realize can basically meet with the middle or small transformer substation’s satisfy, reliably,and automatic running.And it can also realize the transformer substation long-distance management and control by serial communicating with the host computer.
上傳時(shí)間： 2013-11-25
上傳用戶(hù)：黃華強(qiáng)
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(hù)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(hù)：bjgaofei
利用AT89C51型單片機(jī)定時(shí)和中斷功能，配以L(fǎng)M386型音頻功率放大器，構(gòu)成了作息號(hào)音自動(dòng)播放器，為學(xué)校和機(jī)關(guān)管理提供方便。 Abstract: Using timing and interrupt function of the AT89C51 single-chip microcomputer and the LM386 audio power amplifier.It is constituted the automatic bugle player.This player facilitates the institution and the school daily management.
標(biāo)簽： 51單片機(jī) 自動(dòng) 播放器
上傳時(shí)間： 2013-10-10
上傳用戶(hù)：wivai
為了提高環(huán)境參數(shù)采集的自動(dòng)化水平，提升效率，設(shè)計(jì)了無(wú)線(xiàn)傳感器系統(tǒng)。本系統(tǒng)運(yùn)用了傳感器技術(shù)、通信技術(shù)和單片機(jī)技術(shù)，實(shí)現(xiàn)了對(duì)環(huán)境溫度、濕度、光照度以及可燃性氣體濃度等參數(shù)的檢測(cè)。它能夠?qū)崟r(shí)地與上位機(jī)進(jìn)行無(wú)線(xiàn)通信，滿(mǎn)足對(duì)環(huán)境參數(shù)實(shí)時(shí)監(jiān)測(cè)的要求。 Abstract: In order to increase the degree of automation and improve the efficiency of the environment monitoring parameters，the wireless sensor system was developed.Combining with the technique of sensor,automatic monitoring，communication and single-chip microcomputer，it realized real-time monitoring environment parameters,such as temperature，humidity，illumination，concentration of com- bustible gas and so on.At the same time it can communicate with upper personal computers，satisfy the desire of real-time monitoring.
上傳時(shí)間： 2013-11-22
上傳用戶(hù)：longlong12345678
針對(duì)當(dāng)前安檢力學(xué)試驗(yàn)機(jī)所能完成的試驗(yàn)種類(lèi)單一、自動(dòng)化程度低等問(wèn)題，提出一種以ATmega128單片機(jī)為核心控制器的安檢力學(xué)試驗(yàn)機(jī)的設(shè)計(jì)。詳細(xì)闡述了該安檢力學(xué)試驗(yàn)機(jī)各個(gè)組成部分的設(shè)計(jì)原理和方案，并且給出了各部分的軟件設(shè)計(jì)思想和操作流程。經(jīng)過(guò)大量測(cè)試試驗(yàn)表明：設(shè)計(jì)的安檢力學(xué)試驗(yàn)機(jī)可以完成多達(dá)十余種的力學(xué)安檢試驗(yàn)，完全符合相關(guān)國(guó)家標(biāo)準(zhǔn)，并且具有數(shù)據(jù)采集精度高、傳輸速度快、操作安全簡(jiǎn)便等特點(diǎn)，實(shí)現(xiàn)了安檢設(shè)備的多功能化、數(shù)字化和自動(dòng)化。 Abstract: Currently， many mechanical security testing machines have only one function. The degree of automation of them is low. To solve those problems， a new kind of mechanical security testing machine， using ATmega128 micro-controller as its core controller， has been advanced. It describes the components of the machine. The principles and the scheme in the designing processes are presented in detail， and the software architecture and the operation processes of each part are given. After having done many testing， we have reached the following conclusions: the mechanical security testing machine presented can do over ten mechanical security tests complying with related national standards. It has high data acquisition accuracy and high transmission speed. The operation of the machine is simple and safe. In general， this machine is a multi-functional， highly automatic， digitalized security testing device.
標(biāo)簽： ATmega 128 安檢 試驗(yàn)機(jī)
上傳時(shí)間： 2013-11-05
上傳用戶(hù)：a67818601
本文介紹了基于AT89C52 單片機(jī)的自動(dòng)水溫控制系統(tǒng)的設(shè)計(jì)及實(shí)現(xiàn)過(guò)程。該系統(tǒng)具有實(shí)時(shí)顯示、溫度測(cè)量、溫度設(shè)定并能根據(jù)設(shè)定值對(duì)環(huán)境溫度進(jìn)行調(diào)節(jié)實(shí)現(xiàn)控溫的目的以及達(dá)到上下限溫度報(bào)警功能，控制算法是基于數(shù)字PID 算法。關(guān)鍵詞 ：PID AT89C52 脈寬調(diào)制 實(shí)時(shí) Abstract ： This article describes AT89C52 single-chip microcomputer-basedautomatic water temperature control system design and implementation process. Thesystem has real-time display, temperature measurement, temperature settings and theenvironment in accordance with the temperature settings adjusted to achieve thepurpose of temperature control and reach the upper and lower limits of temperaturealarm function, the control algorithm is based on the digital PID algorithm.Keyword: PID AT89C52 PWM real time
上傳時(shí)間： 2013-10-10
上傳用戶(hù)：歸海惜雪
車(chē)輛行駛性能的好壞，不僅取決于發(fā)動(dòng)機(jī)，而且在很大程度上還依賴(lài)于變速器及變速器與發(fā)動(dòng)機(jī)的匹配。在汽車(chē)上使用的自動(dòng)變速器大致有三類(lèi)：液力自動(dòng)變速器（automatic Transmission，AT）、電子控制機(jī)械自動(dòng)變速器（automaticMechanicalTransmission，AMT）和金屬帶式無(wú)級(jí)變速器（Continuously Variable Transmission，CVT）。前兩種變速器都是有級(jí)或分段無(wú)級(jí)自動(dòng)變速，無(wú)級(jí)變速器CVT避免了齒輪傳動(dòng)比不連續(xù)的缺點(diǎn)，具有傳動(dòng)比連續(xù)、傳遞動(dòng)力平穩(wěn)、操縱方便、可使汽車(chē)行駛過(guò)程中經(jīng)常處于良好的性能狀態(tài)、可改善汽車(chē)排放和降低燃油消耗等特點(diǎn)，真正實(shí)現(xiàn)了無(wú)級(jí)變速。我國(guó)的汽車(chē)工業(yè)與發(fā)達(dá)國(guó)家有較大的差距，通過(guò)研制無(wú)級(jí)變速（CVT）控制系統(tǒng)對(duì)縮小差距和世新紀(jì)發(fā)展我國(guó)民族汽車(chē)工業(yè)都具有十分重要的意義。
上傳時(shí)間： 2013-11-11
上傳用戶(hù)：qingzhuhu
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