I believe many friends have come into contact with esp8266. esp01s is the simplest module based on esp8266. However, the esp01s module only has AT function, which is not very friendly to friends who want to burn other firmware and perform secondary development. It may require a USB to serial port module and troublesome wiring and manual control of the boot pin, which is still very troublesome. I redesigned my own version based on the information on the Internet and the plans of other experts (it has been verified by Jiali Chuang). If there are any mistakes, please let me know.
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