畢業(yè)設(shè)計(jì) 基于單片機(jī)實(shí)現(xiàn)數(shù)字萬(wàn)用表的設(shè)計(jì)

 

摘  要

數(shù)字萬(wàn)用表（DMM）亦稱數(shù)字多用表，是目前在電子測(cè)量和維修工作中最常用、最得力的一種工具類數(shù)字儀表。但以往數(shù)字萬(wàn)用表電路復(fù)雜，且實(shí)現(xiàn)不易，為了簡(jiǎn)化數(shù)字萬(wàn)用表電路，本設(shè)計(jì)選擇單片機(jī)為核心。本設(shè)計(jì)的工作原理是測(cè)量時(shí)將所有測(cè)量參數(shù)值轉(zhuǎn)換為直流電壓值。測(cè)量參數(shù)的選擇是由鍵盤(pán)控制電路完成的。單片機(jī)采樣該直流電壓值，再通過(guò)單片機(jī)內(nèi)部的A/D轉(zhuǎn)換將其轉(zhuǎn)換成單片機(jī)所能處理的數(shù)字值，采集到單片機(jī)中，通過(guò)編寫(xiě)程序?qū)⒃撝颠€原為所測(cè)參數(shù)的真值，最后輸送到顯示和語(yǔ)音播報(bào)部分將其傳送給測(cè)量人員。
本課題的設(shè)計(jì)是用已學(xué)的電子信息工程專業(yè)的專業(yè)知識(shí)，利用單片機(jī)設(shè)計(jì)出的一款數(shù)字萬(wàn)用表。這款數(shù)字萬(wàn)用表除了具有測(cè)量電阻、電流、電壓、電容等功能外，還具有語(yǔ)音播報(bào)功能，同時(shí)能把測(cè)量的結(jié)果在LCD顯示器上顯示出來(lái)。

關(guān)鍵詞： 數(shù)字萬(wàn)用表，單片機(jī)，A/D轉(zhuǎn)換
 

ABSTRACT

Digital Multimeter (DMM), also known as the digital multipurpose table, is currently in electronic measurement and maintenance work in the most commonly used, the most effective tools of a number of instruments. But the past digital multimeter circuit complicated and difficult to achieve, in order to simplify the digital multimeter circuit, the design options for the microcontroller core. The design of the working principle is to measure when all measurement parameters for the DC voltage conversion value. Measurement parameters of choice is controlled by the keyboard to complete the circuit. SCM sampling of the DC voltage value, and then through the internal microcontroller A/D converter to convert SCM can handle the number of values, collected the SCM, through the preparation procedures for the reduction of the value The true value of measuring parameters, transported to the final broadcast of the show and voice will be transmitted to the measurement of its staff.
This topic is designed to have been used in the electronics and information engineering expertise, the use of a microcontroller design a digital multimeter. The digital multimeter in addition to measuring resistance, current, voltage, capacitance, and other functions, but also a voice broadcast feature, and can measure the results in the LCD monitor on the show.

Key words： Digital Multimeter(DMM), Single-chip micro-computer(SCM), A/D transformation
        

目   錄
 
摘 要 I
ABSTRACT II

1 前言 3
1.1 課題研究的背景及意義 3
1.2 本課題的研究現(xiàn)狀和水平 3
1.3 數(shù)字萬(wàn)用表的發(fā)展趨勢(shì) 4
1.4 本設(shè)計(jì)實(shí)現(xiàn)的技術(shù)指標(biāo) 5
2 方案分析與選擇 6
2.1 設(shè)計(jì)方案 6
2.2 方案論證 8
3 系統(tǒng)硬件設(shè)計(jì) 9
3.1 凌陽(yáng)SPCE061A簡(jiǎn)介 9
3.1.1 總述 9
3.1.2 性能 9
3.1.3 結(jié)構(gòu)概覽 9
3.1.4 芯片的引腳排列和說(shuō)明 10
3.1.5 特性 11
3.2 系統(tǒng)硬件設(shè)計(jì) 14
3.2.1 參數(shù)測(cè)量電路的設(shè)計(jì) 14
3.2.2 鍵盤(pán)控制電路的設(shè)計(jì) 25
3.2.3 語(yǔ)音播報(bào)和顯示電路的設(shè)計(jì) 26
3.3 電源電路的設(shè)計(jì) 27
4 系統(tǒng)軟件設(shè)計(jì) 29
4.1 主程序設(shè)計(jì) 29
4.2 子程序設(shè)計(jì) 30
4.2.1 聲音功能子程序的設(shè)計(jì) 30
4.2.2 鍵盤(pán)掃描子程序設(shè)計(jì) 32
4.2.3 采樣子程序設(shè)計(jì) 33
5 系統(tǒng)組裝與調(diào)試 36
5.1 系統(tǒng)組裝 36
5.1.1 PCB制作 36
5.1.2 元件焊接 36
5.2 系統(tǒng)調(diào)試 36
5.2.1 硬件調(diào)試 36
5.2.2 軟件調(diào)試 37
5.2.3 綜合調(diào)試 37
5.3誤差分析 37
6 結(jié)論 38
參考文獻(xiàn) 39
附圖A 源程序 40
附錄B 總電路圖 49
致 謝 50