提出了一種基于單片機的溫控系統軟件和硬件的設計方案。本設計采用8 位單片機和
16 位A/D 變換器相組合構成溫度采集系統進一步提高系統的性價比。采用數字PID 控制使溫控精度在300-500℃范圍內達到1℃，并可實現溫度設定值的連續可調。采用鉑電阻溫度測量電路，并利用軟件對測量精度進行自校準；通過電壓前饋控制減少電網干擾。設計中還加入了光電隔離措施及過熱自動保護和報警功能，增強了系統的安全性能。
關鍵字：單片機；A/D 變換器；PID；溫度控制
Abstract: Gives a design of singlechip’s software and hardware of temperature controlling system. The temperature collecting system is composed of 8 bit singlechip and 16 bit A/D converter, and it can improve the performance price rate of the system. The temperature can be controlled within the range of 300-500℃ with a precision of 1℃ and uninterrupted adjustability of temperature setting is realized by Using the digital PID control. Temperature-measuring circuit of platinum resistors and software is employed to carry on adjustment of measured precision. The interference of the grid is reduced by the voltage front feed, and it calls for the application of the photoelectric insulation, the over heating protection and alarm to enhance the security the system.
Keywords: Singlechip; A/D converter; PID; temperature control