風向單片機測量系統(tǒng)的設計—硬件部分

摘 要

風場風向的研究在風場建設中十分重要，本設計提供了一種以高精度環(huán)形電位計為傳感器的風向測量系統(tǒng)。此系統(tǒng)主控電路由單片機AT89C51，“看門狗”電路MAX813L，電壓轉(zhuǎn)換模塊組成。主控電路中AT89C51為系統(tǒng)中央處理器；電壓轉(zhuǎn)換模塊為系統(tǒng)提供各芯片所需工作電壓；“看門狗”電路有防止單片機死機的作用。風向標的偏向角與高精度電位計的輸出電壓成正比，輸出電壓經(jīng)A/D轉(zhuǎn)換芯片ADC0832輸入通道進入芯片內(nèi)部轉(zhuǎn)換成數(shù)字信號，數(shù)字信號由A/D轉(zhuǎn)換芯片ADC0832輸出端輸入到單片機AT89C51后由編程實現(xiàn)對其的運算處理。單片機處理結果可以通過RS-485串行接口傳輸?shù)狡渌獠吭O備。
關鍵詞：風向測量系統(tǒng)；高精度環(huán)形電位計；AT89C51；ADC0832

Abstract

The study of the wind direction for wind fields is very important. This design provides a high-precision circular potentiometer to the sensor test system of the wind direction. The control circuit of this system consists of the single chip AT89C51, "watchdog" circuit MAX813L, voltage conversion module. In this system, the single chip AT89C51 is CPU (Central Processing Unit); the "watchdog" circuit can prevents the microcontroller crash; voltage conversion module can provide working voltage for various system chip. The vane bias angle is proportional to the high-precision potentiometer output voltage. After output voltage converted though A/D to the ADC0832 chip, it import channel into the internal chip to convert into digital signals. Digital signal will input single chip AT89C51 from the A/D conversion chip to ADC0832 output terminal chip, then the programming can operation to this system. The results of single chip processing can be transmitted through the RS-485 serial interface to the other peripherals.
Keywords: wind test system; the high precision circular potentiometer; AT89C51; ADC0832

目 錄

引 言 1
第一章 風向測量系統(tǒng)概述 2
1.1 風向采集系統(tǒng)介紹 2
1.2 主控模塊 2
1.2.1 89C51的主要特性及管腳說明 2
1.2.2 看門狗電路 5
1.2.3 電壓轉(zhuǎn)換電路 6
1.2.4 外部時鐘電路 7
第二章 風向傳感器 8
2.1 風向傳感器原理 8
2.2 信號調(diào)理電路 9
2.2.1 ADC0832芯片介紹 9
2.2.2 芯片ADC0832A/D轉(zhuǎn)換的工作時序 11
第三章 串行接口設計 12
3.1 RS-485標準接口 12
3.2 芯片MAX485介紹及使用方式 12
3.2.1 串口方式選擇 14
3.2.2 AT89C51通信波特率設置 15
結 論 17
參考文獻 18
附 錄 19
謝 辭 20