基于PT100熱電阻的單片機溫度檢測系統(tǒng)設計



目  錄

摘  要 I

Abstract II

1 緒論 1

1.1 課題背景 1

1.2 方案論證 2

1.2.1 單片機選型 2

1.2.2 模數(shù)轉(zhuǎn)換器選型 3

1.2.3 顯示方案確定 3

2 硬件設計 3

2.1 溫度信號的獲取與放大 3

2.1.1 元件介紹 3

2.1.2 放大電路設計 4

2.2 模數(shù)轉(zhuǎn)換單元 5

2.2.1 8位串行A/D轉(zhuǎn)換器ADC0809 5

2.2.2 模數(shù)轉(zhuǎn)換單元電路的設計 7

2.3 鍵盤電路的設計 8

2.4 LED顯示電路的設計 8

2.4.1 LED數(shù)碼管原理 8

2.4.2 LED數(shù)碼管編碼方式 9

2.4.3 LED數(shù)碼管顯示方式和典型應用 10

2.4.4 LED數(shù)碼管的原理圖 11

2.5 聲光報警電路 12

2.6 單片機接口電路 12

 

2.6.1單片機的時鐘電路 12

2.6.2復位電路和復位狀態(tài) 13

3 軟件設計 15

3.1 程序設計語言的選用 15

3.2 軟件程序的設計 16

3.2.1 程序流程 16

3.2.2 鍵盤管理 17

3.2.3 LED顯示 18

3.2.4 模擬量的采集與處理 19

4 抗干擾設計 20

4.1 用于單片機系統(tǒng)的干擾抑制元件 20

4.2 提高單片機系統(tǒng)抗干擾能力的主要手段 21

結(jié)  論 23

致  謝 24

參考文獻 25

附錄1 26

附錄2 27


 




 

摘  要


 本課題以AT89C51單片機系統(tǒng)為核心，對單點的溫度進行實時檢測。采用模擬溫度傳感器PT100對溫度進行檢測；采用串型模數(shù)轉(zhuǎn)換器ADC0809進行A/D轉(zhuǎn)換把溫度信號調(diào)解轉(zhuǎn)換為電壓信號與AT89C51單片機接口設置LED八段數(shù)碼管實時顯示溫度值。本設計包括溫度傳感器、A/D轉(zhuǎn)換模塊、數(shù)據(jù)傳輸模塊、溫度顯示模塊四個部分。文中對每個部分功能、實現(xiàn)過程作了詳細介紹。


關(guān)鍵詞  單片機；PT100熱電阻；ADC0809；溫度檢測


 




The design of Single Chip Microcomputer

Temperature Detection System

Based on the Resistive Thermal Detector of PT100


Abstract

This article AT89C51 monolithic integrated circuit which produces by ATMEL Corporation is the core, can inspect a single point of the temperature in real time. The adoption of the serial A/D for temperature signals into voltage signal mediation AT89C51 Single-Ship Compute interfaces with the eighth LED digital display of real-time temperature. The design includes four parts of the temperature sensor and the A / D converter module and the data transmission modules and the temperature display module. Each part functions and the process was described in the Paper in detail.


Key words   Single-Ship Computer; Resistive Thermal Detector of PT100; ADC0809; Measure-temperature