For a complete electronic design, the first problem is to provide power supply modules for the entire system. The stability and reliability of the power modules is the premise and basis for the smooth operation of the system. Although the 51 single-chip microcomputer has the earliest use time and the widest application range, in the actual use process, one typical problem is that compared with other series of single-chip microcomputers, the 51 single-chip microcomputer is more susceptible to interference and the program runs away, overcoming this phenomenon. An important means of emergence is to configure a stable and reliable power supply module for the microcontroller system.
As shown in the circuit diagram below, the power supply of the power supply module in this minimum system can be supplied through the USB port of the computer or by an external stable 5V power supply module. The power indicator LED is connected to the power circuit. R11 is the current limiting resistor of the LED; S1 is the power switch. 
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