摘 要

氣壓計(jì)被廣泛應(yīng)用于國(guó)防領(lǐng)域、工業(yè)領(lǐng)域、醫(yī)療領(lǐng)域以及我們?nèi)粘＜彝ド钪?。本設(shè)計(jì)中就介紹了一種氣壓的實(shí)時(shí)顯示設(shè)備。它是利用軟、硬件基礎(chǔ)知識(shí)，通過(guò)單片機(jī)與氣壓傳感器的結(jié)合，使得在顯示器上顯示出當(dāng)前大氣壓值。
本文介紹基于氣壓傳感器MPX4105的精密數(shù)字氣壓計(jì)系統(tǒng)的軟、硬件實(shí)現(xiàn)方法。通過(guò)氣壓傳感器MPX4105獲得與汽車胎壓相對(duì)的模擬電壓值，并經(jīng)過(guò)電壓/頻率（V/F）轉(zhuǎn)換模塊轉(zhuǎn)換為數(shù)字脈沖，通過(guò)單片機(jī)對(duì)此脈沖序列的計(jì)數(shù)等處理后獲得實(shí)際的氣壓值，并通過(guò)數(shù)碼管顯示電路顯示。闡述了系統(tǒng)的軟件設(shè)計(jì)，以C語(yǔ)言為開(kāi)發(fā)工具，進(jìn)行了詳細(xì)設(shè)計(jì)和編碼。總體目標(biāo)是實(shí)現(xiàn)系統(tǒng)的可靠性、穩(wěn)定性、安全性和經(jīng)濟(jì)性。

關(guān)鍵詞：氣壓傳感器，電壓/頻率轉(zhuǎn)換，單片機(jī)



The Design of Numeral-barometer Based on SMC

ABSTRACT

Barometer is widely used in the defense sector, industry, medical fields as well as our daily life.Using basic knowledge of hardware and software, and through the combination of SCM and pressure sensors, The current atmospheric pressure value is displayed by the LED.
Introduces a precise numerical barometer system based on MPX4105, giving the achieve-method of soft and hardware Obtain the value of analog voltage according to the air pressure via MPX4105, and convert it into numerical pulse by the voltage/frequency conversion. Recur to the take count of the pulse-sequence and relevant management by the SCM, an actual air-pressure value is obtained. On the system software design, development tools is C language, a detailed design and coding. The overall objective is to achieve system reliability, stability, security and economy.

KEY WORDS: Gs pressure transducer，Voltage / frequency conversion，SCM

目　錄

前　言 1
第1章 概述 2
1.1 課題背景 2
1.2技術(shù)概況及發(fā)展趨勢(shì) 3
1.3數(shù)字胎壓計(jì)系統(tǒng)設(shè)計(jì)的意義 7
1.4國(guó)內(nèi)外相關(guān)技術(shù) 8
第2章 系統(tǒng)總體設(shè)計(jì) 9
2.1 設(shè)計(jì)思路分析 9
2.1.1 設(shè)計(jì)方案一 9
2.1.2 設(shè)計(jì)方案二 9
2.2 系統(tǒng)總體結(jié)構(gòu) 10
2.3系統(tǒng)各功能模塊的設(shè)計(jì)思想 11
2.3.1 A/D轉(zhuǎn)換模塊 11
2.3.2 數(shù)據(jù)處理模塊 11
2.3.3 顯示模塊 11
2.4氣壓傳感器的選擇 12
2.5 A/D轉(zhuǎn)換器件的選擇 12
2.6三態(tài)穩(wěn)壓器 14
2.7數(shù)碼管顯示 14
2.7.1 數(shù)碼管靜態(tài)顯示 14
2.7.2 數(shù)碼管動(dòng)態(tài)顯示 14
2.8系統(tǒng)配置 14
第3章 硬件電路設(shè)計(jì) 16
3.1 單片機(jī)電路部分 16
3.2 氣壓傳感和V/F轉(zhuǎn)換電路部分 19
3.3胎壓計(jì)電源與單片機(jī)部分 25
第4章 軟件設(shè)計(jì) 27
4.1 用C語(yǔ)言開(kāi)發(fā)單片機(jī)的優(yōu)勢(shì) 27
4.2如何由頻率計(jì)算出氣壓值 28
4.3軟件實(shí)現(xiàn) 28
第5章 系統(tǒng)調(diào)試與仿真 34
5.1 偉福仿真介紹 34
5.2Keilc介紹 36
5.3 聯(lián)機(jī)調(diào)試過(guò)程 39
結(jié)　論 40
謝 辭 41
參考文獻(xiàn) 42
附　錄 43
外文資料翻譯 44