通用短距離無線采集卡畢業(yè)設計


目    錄

中文摘要 I
英文摘要 II
1  緒論 1
1.1  課題背景 1
1.2  數(shù)據(jù)采集系統(tǒng)簡單介紹 1
1.3  無線采集卡系統(tǒng)框圖 3
2  數(shù)據(jù)采集部分 5
2.1  信號調(diào)理模塊的設計 5
2.1.1  常見傳感器簡介 5
2.1.2  差分輸入和電流信號輸入 5
2.1.3  電壓信號輸入 7
2.1.4  頻率信號輸入 8
2.1.5  數(shù)字信號的輸入 10
2.2  AD7714的硬件電路設計 15
2.2.1  AD7714與MCU的接口 16
2.2.2  對AD7714 的讀寫要點和注意事項 17
2.2.3  AD7714與基準電壓源AD780連接 18
3  數(shù)據(jù)處理和發(fā)送、接收硬件設計 19
3.1  單片機部分 19
3.1.1  STC89C52 的特點及工作原理 19
3.1.2. STC89C52管腳說明 20
3.2  無線芯片的選擇 22
3.2.1  NRF24L01無線數(shù)據(jù)傳輸部分 22
3.2.2  NRF24L01簡介 24
3.2.3  NRF24L01工作模式 26
3.2.4  NRF24L01配置過程 29
4  串口通信模塊設計 30
4.1  通信簡介 30
4.2  單片機串口通信接口 31
4.2.1  單片機串口結(jié)構(gòu) 31
4.2.2  單片機與PC 機之間電平轉(zhuǎn)換硬件接口 33
4.2.3  單片機串口通信設置及初始化 35
5  系統(tǒng)電源電路設計 39
5.1  計算參數(shù)值 39
5.1.1  變壓器的計算 39
5.1.2  整流橋的選擇 39
5.1.3  濾波電容的計算 39
5.2  穩(wěn)壓電路原理圖 40
6  系統(tǒng)軟件設計 41
6.1  主程序設計 41
6.2  AD7714和單片機的接口程序設計 42
6.3  無線芯片和單片機接口程序設計 42
6.4  單片機和PC機接口的程序設計 43
7  總結(jié) 46
致謝 47
參考文獻 48
附錄 49
 
通用短距離無線采集卡設計

摘    要

本文介紹了基于單片機的無線數(shù)據(jù)采集的硬件設計和軟件設計，該系統(tǒng)能夠應用于人們的生活，實現(xiàn)工業(yè)生產(chǎn)現(xiàn)場的短距離數(shù)據(jù)采集和控制。數(shù)據(jù)采集系統(tǒng)硬件部分主要是將常見的傳感器信號轉(zhuǎn)換成標準的數(shù)字信號,從而使單片機可以進行處理并通過無線芯片發(fā)射和接收。數(shù)據(jù)采集與通信控制采用了信號調(diào)理模塊和單片機STC8C52實現(xiàn)，主要是以單片機為核心，以及其他的功能模塊:傳感器信號調(diào)理模塊、A/D模數(shù)轉(zhuǎn)換模塊、無線芯片發(fā)收模塊和串行接口模塊。多路傳感器信號經(jīng)過模數(shù)轉(zhuǎn)換器AD7714進行模數(shù)轉(zhuǎn)換，單片機處理采集的數(shù)據(jù)，然后通過發(fā)射端NRF24L01發(fā)射出去，接收端的NRF24L01接收后，經(jīng)單片機由MAX232上傳至上位機。
軟件部分主要包括AD7714和單片機的接口程序設計、單片機和無線芯片的接口程序設計、單片機和上位機的接口程序設計。

關鍵詞  數(shù)據(jù)采集  STC89C52  AD7714  無線芯片

 
The Design Of General Short-range Wireless Data
Acquisition Card

Abstract

This paper introduces the wireless data acquisition based on single-chip microcomputer of the hardware design and software design, This system can be applied in people's life, the industrial production site data acquisition and control in short distance. This paper is focused on the data acquisition system, the hardware part focuses on how to converts common sensor signals to standard digital signal which could processed by SCM ,then the data is transmitted and receipted by wireless chips. Data collection and communication control system adopt the Signal Conditioning module and realized by STC89C52.The hardware is consisted of some modules which are sensor Signal Conditioning module, wireless chip module and serial interface module. Multi-channel sensor signals is processed by AD7714, which convert the collected analog data to digital data. SCM in charge of data processing, and transmit the data through wireless chips NRF24L01, after another NRF24L01 accepted and processed by SCM, the processed data is delivered by MAX232 interface to computer.
 The software design mainly consists of AD7714 and SCM interface program design, SCM and wireless chip interface program design, SCM and PC interface program design.

KEY WORDS  Data Acquisition  STC89C52  AD7714  Wireless-Chip