SCM smart "220V AC Cooling Fan" governor design that cleverly using infrared remote control technology, microprocessor control technology, variable speed technology and temperature sensing technology, the intelligent control technology to control appliances, sampling the ambient temperature around the human body "220V AC Cooling Fan" speed control. System 2 control device works to AT89C51 as the core, using a temperature sensor circuit, timely and accurate collection of ambient temperature, after A / D converter, the level of the signal input to the AT89C51, AT89C51 through data processing, and outputs a control signal Triac use variable speed motor to adjust the "220V AC Cooling Fan" speed.