[Abstract] This design is to automatically control the temperature of the fan system, in order to make the ordinary fan more intelligent. It has sensitive temperature detection and display functions. As the control core, STC89C52RC single chip microcomputer collects the environmental temperature through the temperature sensor DS 18B20, thus establishing a control system, which makes the fan speed automatically adjust with the change of the external temperature, and realizes "high temperature, strong wind and low temperature".

[Keywords:] SCM temperature sensor; fan