"220V Cooling Fan" is compatible with the MCS-51 microcontroller, 4K bytes of programmable flash memory, 1000 write / erase life cycle of 10 years of data retention time, 128 * 8 internal RAM, 32 programmable I / O lines two 16-bit timer / counters. "220V Cooling Fan" is the microprocessor, memory (RAM and ROM), input / output interfaces, and timer / counters integrated IC chip. Then connect the temperature sensor, the delay switch circuit, the electromagnetic push-button switches, LED display, A / D, D / A conversion circuit, the control circuit SCR trigger, an oscillation circuit, a power supply circuit and other modules. "220V Cooling Fan" SCM control action, which is equivalent to the human brain.