本文介紹了基于單片機AT89C51 的溫度控制系統的設計方案與軟硬件實現。采用溫度傳感器DS18B20 采集溫度數據，液晶顯示屏LCM1602 顯示溫度數據，AT24C02B 存儲溫度上下限設定值，按鍵設置溫度上下限并可改變加熱器與致冷器的溫控狀態，當度低于設定的下限時，單片機啟動加熱器加熱，同時點亮綠色發光二極管，當溫度高于設定的上限時，單片機啟動致冷器降溫，同時點亮紅色發光二極管。給出了系統總體框架、程
序流程圖和Proteus 仿真結果，并在硬件平臺上實現了所設計的功能。
關鍵詞：單片機；溫度控制系統；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