[Abstract] This design is the fan system of an automatic temperature control,it is to make the ordinay fans become more intelligent, it has a sensitive temperature detection and display functions, as a control is STC89C52RC microcontroller core, through the temperature sensor DS18B20 data collection on the ambient temperature in order to establish a control system that allows the fan speed changes with the external temperature automatically adjust the speed, to achieve "high temperature, wind, low temperature, wind speed and weak ".
[Key words] SCM; temperature sensor; fan