Through control of the microcontroller we achieved "220V Cooling Fan" main function: When you press the key, system initialization default setting temperature of 25 degrees, if the outside temperature is higher than the set temperature "220V Cooling Fan" is operated, If the outside temperature is below the set temperature is higher than the wind page does not rotate, also shows the outside temperature. You can set the desired temperature, and simultaneously display the set temperature, press the plus or minus key to exit the setting function. "220V Cooling Fan" automatic control, so fans of the home appliances become more intelligent. Overcome the common difficulties fans can not automatically adjust the speed according to the outside temperature. Intelligent fan design has important practical significance.