摘要：本水位監(jiān)測報警器使用5V低壓直流電源（也可以用3節(jié)5號電池代替）就可以對5~15厘米的水位進行監(jiān)測，用LED顯示和數(shù)碼管顯示水位，并可以對不再此范圍內(nèi)的水位發(fā)出報警。主要采用CD4066、74LS86、74LS32、CD4511芯片，再加上數(shù)碼管、蜂鳴器、發(fā)光二極管、電阻這些器件組成一個簡單而靈敏的監(jiān)測報警電路，操作簡單，接通電源即可工作。因為大部分電路采用數(shù)字電路，所以本水位監(jiān)測報警器還具有耗能低、準確性高的特點。關(guān)鍵字：譯碼電路 報警電路 監(jiān)測電路 Abstract: The water level alarm monitoring the use of 5 V low-voltage DC power (can also use three batteries replaced on the 5th) will be able to 5 to 15 centimeters of water level monitoring, with LED display and digital display of water level, and this can no longer Within the scope of a water level alarm. Mainly CD4066, 74LS86, 74LS32, CD4511 chips, coupled with digital control, buzzer, light-emitting diode, the resistance of these devices composed of a simple and sensitive monitoring alarm circuits. Because the majority of circuits using digital circuitry, so the water level monitored alarm system also has low energy consumption, high accuracy of the characteristics. Keyword: Decoding circuit alarm circuit monitoring circuit
標簽： 水位 監(jiān)測報警 系統(tǒng)原理
上傳時間： 2013-11-05
上傳用戶：王慶才
一種實用的微機自動配料秤系統(tǒng):介紹一種由單片機構(gòu)成的配料秤。敘述了秤的傳感器、變送器、信號的變換、硬件原理、軟件流程以及和DCS 系統(tǒng)構(gòu)成的單回路調(diào)節(jié)系統(tǒng),此系統(tǒng)可廣泛地應用于各行業(yè)的配料控制中。關(guān)鍵詞:配料秤 單片機 單回路調(diào)節(jié)系統(tǒng) DCS 系統(tǒng) Abstract :A proportioning weigher based on single chip computer is introduced. Sensors , transmitters , signal converting , principle of hardware ,software flowchart of proportioning weigher and single loop control system composed with DCS system are emphasized ,this system can be used in proportioning control of various trades extensively.Key Words :Proportioning Weigher ,Single Chip Computer ,Single Loop Control System ,Distributed Control System
上傳時間： 2013-10-12
上傳用戶：zwei41
提出了一種以ARM微處理器為控制核心的遠程無線視頻監(jiān)控終端的設(shè)計方案，其監(jiān)控終端的硬件設(shè)計包括視頻采集處理、中央管理控制、無線傳輸3個模塊。并給出了監(jiān)控終端的軟件開發(fā)平臺和開發(fā)模式的系統(tǒng)啟動代碼、嵌入式Linux系統(tǒng)移植以及驅(qū)動程序和應用程序。測試結(jié)果表明，該監(jiān)控終端設(shè)計方案合理、有效，基本滿足監(jiān)控需求。 Abstract: A remote wireless video monitoring terminal design， which uses ARM microprocessor as its core control， is proposed in this paper.The hardware design of monitoring terminal system is composed of the video acquisition and processing module， the central management and control module， wireless transmission module.Meanwhile the monitoring terminal-s software development platform and development patterns are designed. Also the design of the system-s start codes， embedded Linux system-s transplantation process， driver and the corresponding applications are given. The results showed that the monitoring terminal design is reasonable， effective， basically meet monitoring requirements.
標簽： ARM 遠程無線 視頻監(jiān)控 終端設(shè)計
上傳時間： 2013-11-13
上傳用戶：wanqunsheng
This document provides practical, common guidelines for incorporating PCI Express interconnect layouts onto Printed Circuit Boards (PCB) ranging from 4-layer desktop baseboard designs to 10- layer or more server baseboard designs. Guidelines and constraints in this document are intended for use on both baseboard and add-in card PCB designs. This includes interconnects between PCI Express devices located on the same baseboard (chip-to-chip routing) and interconnects between a PCI Express device located “down” on the baseboard and a device located “up” on an add-in card attached through a connector. This document is intended to cover all major components of the physical interconnect including design guidelines for the PCB traces, vias and AC coupling capacitors, as well as add-in card edge-finger and connector considerations. The intent of the guidelines and examples is to help ensure that good high-speed signal design practices are used and that the timing/jitter and loss/attenuation budgets can also be met from end-to-end across the PCI Express interconnect. However, while general physical guidelines and suggestions are given, they may not necessarily guarantee adequate performance of the interconnect for all layouts and implementations. Therefore, designers should consider modeling and simulation of the interconnect in order to ensure compliance to all applicable specifications. The document is composed of two main sections. The first section provides an overview of general topology and interconnect guidelines. The second section concentrates on physical layout constraints where bulleted items at the beginning of a topic highlight important constraints, while the narrative that follows offers additional insight.
標簽： pci PCB 設(shè)計規(guī)范
上傳時間： 2014-01-24
上傳用戶：s363994250
在Multisim 10軟件環(huán)境下，設(shè)計一種由運算放大器構(gòu)成的精確可控矩形波信號發(fā)生器，結(jié)合系統(tǒng)電路原理圖重點闡述了各參數(shù)指標的實現(xiàn)與測試方法。通過改變RC電路的電容充、放電路徑和時間常數(shù)實現(xiàn)了占空比和頻率的調(diào)節(jié)，通過多路開關(guān)投入不同數(shù)值的電容實現(xiàn)了頻段的調(diào)節(jié)，通過電壓取樣和同相放大電路實現(xiàn)了輸出電壓幅值的調(diào)節(jié)并提高了電路的帶負載能力，可作為頻率和幅值可調(diào)的方波信號發(fā)生器。Multisim 10仿真分析及應用電路測試結(jié)果表明，電路性能指標達到了設(shè)計要求。 Abstract: Based on Multisim 10， this paper designed a kind of rectangular-wave signal generator which could be controlled exactly composed of operational amplifier， the key point was how to implement and test the parameter indicators based on the circuit diagram. The duty and the frequency were adjusted by changing the time constant and the way of charging and discharging of the capacitor， the width of frequency was adjusted by using different capacitors provided with multiple switch， the amplitude of output voltage was adjusted by sampling voltage and using in-phase amplifier circuit，the ability of driving loads was raised， the circuit can be used as squarewave signal generator whose frequency and amplitude can be adjusted. The final simulation results of Multisim 10 and the tests of applicable circuit show that the performance indicators of the circuit meets the design requirements.
上傳時間： 2014-01-21
上傳用戶：shen007yue
PQP is a library for performing three types of proximity queries on a pair of geometric models composed of triangles:
標簽： performing geometric proximity library
上傳時間： 2014-01-13
上傳用戶：love_stanford
FuncPlotter is a combined Java application and applet for displaying two-dimensional plots of explicit functions in one variable (ie, FuncPlotter plots functions of the form y = f(x), where f(x) is composed from common mathematical operators).
標簽： two-dimensional FuncPlotter application displaying
上傳時間： 2015-12-16
上傳用戶：妄想演繹師
This project aims to distribute a facial animation system with speech, developed to brazilian portuguese case. This system is composed by many modules: movement extraction, facial animation and speech, through a text-to-speech system.
標簽： distribute animation developed brazilian
上傳時間： 2016-01-23
上傳用戶：無聊來刷下
LTV350QV-F09 is a TMR(Transmissive with Micro Reflective) type color active matrix TFT (Thin Film Transistor) liquid crystal display (LCD) that uses amorphous silicon TFT as a switching devices. This model is composed of a TFT-LCD module, a driver circuit and a back-light unit and a touch screen panel(TSP). The resolution of a 3.5" contains 320RGBx240 dots and can display up to 16.7M colors.
標簽： Transmissive Reflective active matrix
上傳時間： 2013-12-11
上傳用戶：大三三
snmp4j 1.8.2版 The org.snmp4j classes are capable of creating, sending, and receiving SNMPv1/v2c/v3 messages. A SNMP message is composed of its message header and its PDU payload. This package contains three main groups of classes and interfaces:
標簽： receiving creating classes capable
上傳時間： 2016-12-31
上傳用戶：qazxsw
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