【正文】 ..........32第 4 章 軟件設(shè)計 .....................................................................................................35 系統(tǒng)的軟件設(shè)計思路 .....................................................................................35 初始化子程序 .................................................................................................36 鍵盤子程序 .....................................................................................................36 A/D 子程序 ......................................................................................................37 液晶顯示子程序 .............................................................................................38第 5 章 仿真測試 .....................................................................................................40 PROTEUS 軟件 ...................................................................................................40 PROTEUS 電路設(shè)計 ...........................................................................................41 Proteus 源文件設(shè)計和目標代碼生成 ......................................................42 Proteus 仿真 .............................................................................................43 仿真調(diào)試小結(jié) .................................................................................................46結(jié) 論 .......................................................................................................................48致 謝 .......................................................................................................................49參考 文獻 ...................................................................................................................50附錄 1 電源模塊參數(shù)表 ..........................................................................................53III附錄 2 C 語言程序 ....................................................................................................55IContentsABSTRACT(chinese) .................................................................................................IABSTRACT...............................................................................................................IIChapter 1 Introduction .............................................................................................1 Summari ............................................................................................................1 Classify..............................................................................................................2 The principle of the electronic pressure switch.................................................3 The overseas development ................................................................................4Chapter 2 the project design ........................................................................................6 Design structure diagram ..................................................................................6 Scheme in the controller....................................................................................6 Pressure sensor selection...................................................................................7 Type of pressure test..................................................................................7 Piezoresistive sensor principle of work.....................................................9 Bridge principle .......................................................................................11 Sensor is final plan ..................................................................................14Chapter 3 the hardware circuit design ..................................................................15 The overall design diagram.............................................................................15 Pressure sensor ................................................................................................15 The characteristic of the sensor ...............................................................16 Piezoresistive sensor measure circuit ......................................................16 Parameters are calculated ........................................................................17 Signal conditioning circuit and amplification .................................................19 Circuit structure .......................................................................................19 Active filter parameters are calculated ....................................................22II A/D conversion circuit ....................................................................................23 TLC1543 A/D conversion module ..........................................................23 The characteristics of the.........................................................................23 A/D acquisition time is calculated...........................................................24 TLC1543 and SCM interface circuit design............................................24 Display circuit .................................................................................................25 LM032L module......................................................................................25 Connection module and MCU ................................................................26 The keyboard circuit .......................................................................................27 MCU and keyboard interface circuit design............................................27 Relay and alarm device ...................................................................................28 The working principle of solid state relay ...............................................28 The relay is connected circuit..................................................................29 Alarm device ...........................................................................................29 Pow