When I make gadgets for myself, I often use the stc series of microcontrollers. Every time I download, I have to unplug the power and re-power on, which is very troublesome. According to the stc download software mentioned on the Internet, the rts pin of the ch340 series will be pulled low during downloading. You can increase the The capacitor controls a MOS tube to achieve short-term automatic power-off. It can be realized by building a circuit test, just for use. After the test, the capacitance should be above 30uf, and the download will be stable.
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