多通道數(shù)據(jù)采集系統(tǒng)的開發(fā)

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1、目錄摘要IIIABSTRACTIV1前言11.1多路數(shù)據(jù)采集系統(tǒng)簡(jiǎn)介11.2本設(shè)計(jì)的主要任務(wù)12系統(tǒng)硬件設(shè)計(jì)32.1硬件設(shè)計(jì)思想32.1.1多路數(shù)據(jù)輸入部分32.1.2采樣保持部分32.1.3A/D轉(zhuǎn)換部分42.1.4PC和單片機(jī)的通信部分42.1.5獨(dú)立鍵盤和顯示部分42.1.6電源部分42.2硬件電路設(shè)計(jì)52.2.1單片機(jī)AT89S5152.2.2多路轉(zhuǎn)換開關(guān)82.2.3前置放大電路102.2.4采樣/保持電路122.2.5模/數(shù)轉(zhuǎn)換電路172.2.6單片機(jī)與PC機(jī)通信的接口電路222.2.7鍵盤結(jié)構(gòu)232.2.8液晶顯示242.2.9系統(tǒng)電源292.2

2、.10系統(tǒng)總圖363程序流程圖373.1主程序流程圖373.2A/D轉(zhuǎn)換程序的流程圖383.3鍵盤和顯示程序的流程圖394系統(tǒng)性能及誤差分析404.1系統(tǒng)可靠性措施404.1.1低功耗措施404.1.2抗干擾措施405結(jié)論41謝辭42參考文獻(xiàn)43附錄44摘要本設(shè)計(jì)主要完成了基于AT89S51單片機(jī)控制的數(shù)據(jù)采集系統(tǒng)的硬件電路的設(shè)計(jì)。本系統(tǒng)的硬件設(shè)計(jì)主要包括：多路轉(zhuǎn)換開關(guān)及前置放大電路的設(shè)計(jì)，采樣保持電路的設(shè)計(jì)，模數(shù)轉(zhuǎn)換電路的設(shè)計(jì)，PC機(jī)通信的技術(shù)，鍵盤和顯示的設(shè)計(jì)，系統(tǒng)電源的設(shè)計(jì)。多路轉(zhuǎn)換開關(guān)及前置放大電路的設(shè)計(jì)中重點(diǎn)介紹了多路開關(guān)的選擇、AD521放大倍數(shù)

3、的計(jì)算以及多路開關(guān)CD4051和放大器AD521硬件連接電路。采樣保持電路的設(shè)計(jì)中重點(diǎn)介紹了采樣保持電路的原理和主要參數(shù)以及采樣保持器的選擇和連接電路。模數(shù)轉(zhuǎn)換電路的設(shè)計(jì)中重點(diǎn)介紹了系統(tǒng)A/D通道的選擇和A/D轉(zhuǎn)換器的各項(xiàng)誤差分析以及A/D轉(zhuǎn)換器AD574的介紹、輸入方式和連接電路。單片機(jī)與pc機(jī)通信主要是利用MAX232單芯片RC-232標(biāo)準(zhǔn)的接口通信電路。鍵盤和顯示的設(shè)計(jì)采用八個(gè)獨(dú)立鍵盤并通過串行通信的方式傳輸?shù)?2864中并顯示。電源部分的設(shè)計(jì)通過采用2*6V的變壓器對(duì)220V的輸入交流電進(jìn)行降壓，經(jīng)二極管全波整流，通過三端穩(wěn)壓器的穩(wěn)壓，輸出5V直流電

4、壓，利用555時(shí)基電路輸出15V的雙電源電壓。關(guān)鍵詞：數(shù)據(jù)采集；AT89S51單片機(jī)；CD4051；MAX232Multi-channeldataacquisitionsystemdevelopmentABSTRACTThedesigncompletesthehardwaredesignofdataacquisitionsystemthatitbasesonthecontrolofAT89S51microcontroller.Thissystemhardwaredesignincludes:multiplexerswitchandpreamplifierci

5、rcuitdesign,samplingkeepcircuitdesign,thedesignofthecircuitmoduleconversion,thePCcommunicationtechnology,thekeyboardanddisplaydesign,thedesignofthepowersystem.Themultiplexerswitchandpreamplifiercircuitdesignfocusesonintroducingthemultipleswitchchoice,AD521magnificationcalculationan

6、dmultipleswitchCD4051andamplifierAD521hardwareconnectioncircuit.Samplingkeepcircuitdesignofmainlyintroducedinsamplingkeepingcircuitprincipleandmainparametersandimplementthechoiceandsamplingkeepconnectioncircuit.ThedesignofthecircuitmoduleconversionintroducedthesystemA/Dchannelselec

7、tionandA/DconverterandtheerroranalysisoftheA/DconverterAD574introduction,inputmethodsandconnectioncircuit.SCMandPCcommunicationisuseofaMAX232single-chipcomposedofRC-232standardinterfacecommunicationcircuit.Keyboardanddisplaydesignwitheightseparatekeyboardandthroughserialcommunicati

8、onmodeto12864anddisplay.Th