基于LPC2378的高精度数据采集系统设计 - 图文

基于LPC2378的高精度数据采集系统设计

摘要

数据采集系统用于从一个或多个源采集模拟信号并将信号转换成可供终端设备,如数字计算机,通信网络分析和传输的数字形式。输入到数据采集系统 中的模拟信号往往是由传感器和变送器将实际参数,比如压力,温度,流量等转 化成相应的电信号。这些相应的电信号通常被数据采集系统转化,然后被终端设 备以数字量形式利用.系统保障信号的准确和完整性的能力是衡量这个系统质量的标准。

在用工控机进行数据测量和控制时,必须将信号输入到工控机里和将工控机 里数据输出去。数据采集卡功能强大,可以实现多种信号的输入和输出。以LPC2378微型处理器为核心的数据采集和处理系统,提供极其灵活的面向对象的动态图形功能以及丰富的图形库.在\数据采集系统\中得到广泛应用。

依托LPC2378为核心处理器在嵌入式应用领域内的成熟技术，设计新一代的基于lpc2378的多参数数据采集仪，可提升自动化 监测系统的技术水平。通过对数据采集系统的分析,以ADS1.2开发工具设计出工控机数据采集系统；同时,对数据采集系统的原理,实现,意义作了主要介绍,总结了数据采集系统的特点以及数据采集系统在ADS1.2下的实现。

并以其在1个典型 自动气象站中的应用为实例，着重说明外接传感器的接口电路、低功耗、大容量固态存储等的设计，并阐明数据 采集仪嵌入式系统软件设计的过程。

通过试验结果表明，该系统效果良好，有极大的应用潜力。

[关键词]：LPC2378, 数据采集系统，大容量储存，低耗能。

Based on LPC2378 high accuracy of the data

acquisition system design

Abstract：Data acquisition system used for from one or DuoGe source colle

ction analog signals and will signal conversion to available for terminal equipm ent, such as digital computer, communication network analysis and transmissio n of the digital form. Input to the data acquisition system of the analog signal is often the sensor and the transmitter will the actual parameters, such as pressure, temperature, flow rate and turn into the corresponding electric signals. The corresponding signal is usually data acquisition system transformation, and be prepared to a terminal digital quantity of system security signal form. The accuracy and completeness of the ability to measure the quality of the system is the standard.

With industrial computer in data measurement and control, must the signal is input to the industrial computer in industrial output data and will go to. The data acquisition card powerful, can realize DuoZhong signal input and output. To LPC2378 micro processor as the core of the data acquisition and processing system, and provide extremely flexible object oriented dynamic graphics functions and the rich graphics library. In \has been widely used.

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Relying on LPC2378 as the core processor in embedded applications in the

mature technology, design of a new generation of LPC2378 based on the parameter data acquisition instrument, can promote automatic monitoring system level of technology.Through to the analysis of the data acquisition system, in order to ADS1.2 development tool to design the industrial data collection system; At the same time, the principle of data acquisition system, realize the meaning, mainly introduced, summarizes the characteristics of the data acquisition system and data collecting system in the realization of the ADS1.2 next.

And with its in a typical automatic weather stations of the application for example, the focus on external sensor interface circuit, low power consumption, solid state storage capacity, and expounds the design of embedded system software and data acquisition instrument design process.

Through the test results show that the system has good effectiveness, have great potential application

Key words: PC2378, data acquisition system，The large capacity to store, the

low consumption.

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目录

一. 绪 论 ..................................... 5

（一）设计背景....................................................................................................................... 5

（二）设计意义....................................................................................................................... 6

二.系统整体结构和硬件设计 ........................ 6

（一）系统构造....................................................................................................................... 6 （二）主控............................................................................................................................... 8 （三）硬件............................................................................................................................... 8

（1）传感器 ..................................................................................................................... 8 （2）电源 ......................................................................................................................... 9 （四）处理模块..................................................................................................................... 10

（1）A/D接口电路 ........................................................................................................ 10 （2）D/A接口电路 ........................................................................................................ 10 （3）R/D接口电路 ........................................................................................................ 10 （4）串口扩展模块 ....................................................................................................... 11 （5）USB接口电路设计 ................................................................................................ 12

三.系统功能设计 ................................ 12

（一）系统软件设计............................................................................................................. 12 （二）低耗能设计................................................................................................................. 13 （三）大容量储存设计 ......................................................................................................... 14

四.实验测试 ................................... 14

（一）使用USB和以太网的RAM.......................................................................................... 14 （二）温度数据采集测试 ..................................................................................................... 15

五.结语 ...................................... 16 六.参考文献 ................................... 17 七.致 谢 ..................................... 18 八.附 录 ..................................... 19

（一）数据采集系统原理图 ................................................................................................. 19 （二）LPC2378资料图 ........................................................................................................ 20 （三）智能CAN接口卡 ...................................................................................................... 21

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