单片机在电子产品中的应用已经越来越广泛，在很多的电子产品中也用到了温度检测和温度控制，但那些温度检测与控制电路通常较复杂，成本也高，本文提供了一种低成本的利用单片机多余I／O口实现的温度检测电路，该电路非常简单，且易于实现，并且适用于几乎所有类型的单片机。-MCU in the application of electronic products has been more and more widely, in many electronic products are also used in the temperature detection and temperature control, but the temperature detection and control circuits are usually more complex, costs are also high, this article provides an use of low-cost single-chip redundant I/O port implementation of the temperature detection circuit, the circuit is very simple and easy to achieve, and applicable to almost all types of single-chip microcomputer.