Abstract：The design of single-chip’s temperature control system is introduced from hardware and software, and simply explains how to actualize the temperature control. The hardware principle and software case fig are described. Some important techniques in a design scheme of the hardware and the software of the temperature control by single-chip microcomputer are introduced. The system mostly takes 8031 single-chip microcomputer as core, it is structured by temperature testing circuit, A/D switch circuit, zero passage testing circuit, warning and indication circuit, optical-electrical isolation and power amplifier circuit and so on.
The main content of this design is temperature testing circuit that uses AT89C51 single-chip microcomputer .It is a part of the whole design that cannot be lacked. The system is used to collect and control temperature in real time. The temperature automatic control system based on single-chip microcomputer is described in the article including system scheme，parts of an apparatus choice, theoretical analysis，the design of hardware and software, system testing，and the main technical performance parameters．
Key Words：Single—Chip Microcomputer；Temperature sensor；Temperature collecting；Temperature controlling；PID algorithm
