本文介紹了基于單片機(jī)AT89C51 的溫度控制系統(tǒng)的設(shè)計(jì)方案與軟硬件實(shí)現(xiàn)。采用溫度傳感器DS18B20 采集溫度數(shù)據(jù)，液晶顯示屏LCM1602 顯示溫度數(shù)據(jù)，AT24C02B 存儲(chǔ)溫度上下限設(shè)定值，按鍵設(shè)置溫度上下限并可改變加熱器與致冷器的溫控狀態(tài)，當(dāng)度低于設(shè)定的下限時(shí)，單片機(jī)啟動(dòng)加熱器加熱，同時(shí)點(diǎn)亮綠色發(fā)光二極管，當(dāng)溫度高于設(shè)定的上限時(shí)，單片機(jī)啟動(dòng)致冷器降溫，同時(shí)點(diǎn)亮紅色發(fā)光二極管。給出了系統(tǒng)總體框架、程
序流程圖和Proteus 仿真結(jié)果，并在硬件平臺(tái)上實(shí)現(xiàn)了所設(shè)計(jì)的功能。
關(guān)鍵詞：?jiǎn)纹瑱C(jī)；溫度控制系統(tǒng)；溫度傳感器；液晶顯示器

Abstract：The design and implementation of temperature control system based on single chip microcontroller AT89C51 are introduced in this paper. Temperature data are collected by
DS18B20, shown on LCM1602. The set temperature limits are stored in AT24C02B. The temperature limits and the control states of heater and cooler can be changed by key-presses.
When the temperature is under the lower limit, the heater starts with the green-LED on，
oppositely，cooler starts with the red-LED on while the temperature is over the upper limit. The overall framework of the system, the program flow chart and a simulation result of Proteus are given. The designed functions are achieved in hardware platform.
Keywords：Single chip microcontroller, Temperature control system, Temperature sensor, LCD