針對DS18B20 采集精度高但讀取溫度速度慢的特點，本文設計開發(fā)了一套層次化
多點數(shù)字化測溫系統(tǒng), 該系統(tǒng)是一個PC 機為主控機，由多個單片機和多個數(shù)字溫度傳感器DS18B20 構成溫度檢測系統(tǒng)。系統(tǒng)分為三層，每一層都采用了模塊化設計，便于系統(tǒng)的擴展。本文給出了系統(tǒng)的總體結構框圖及底模塊單元電路圖。軟件部分給出了數(shù)據(jù)轉(zhuǎn)發(fā)控制流程圖。該系統(tǒng)結構簡單,溫度控制準確,測量精度高和實時性強,具有很高的實際應用價值。
關鍵詞: 實用、DS18B20、層次化、RS-485串行總線、精確測溫
Abstract: Aiming at the DS18B20’s characteristics which is high collecting precision but low speed of reading the temperature, this text designed and developed a set of hierarchical Digital Temperature Measuring System. That system was a temperature examination system which is composed by a PC machine that is control machine mainly, many single chip computers and many digital temperature sensors of DS18 B20. The system is divided into 3 layers; the each layer adopted a module design for expanding system easily. This text gives the total structure frame of the system diagram and Bottom module unit electric circuit diagram of the each layer. The part of software give the data exchange control flow chart.

The system's structure is simple, temperature controlling is accurate, measure accuracy is high, and real-time character is strong and has very high practical and applied value