51 microcontroller wireless downloader

Question requirements

Implement STC brand 51 microcontroller code download over the air

Bilibili demo video link: https://www.bilibili.com/video/BV1tR4y1c7mb?spm_id_from=333.999.list.card_archive.click

Question analysis

There are two main points for downloading the 51 microcontroller: wireless data transmission and cold start

STC microcontroller downloader = USB to serial port + cold boot

Wireless STC microcontroller downloader = USB to wifi + wifi to serial port + cold boot

USB to wifi = NodeMCU IoT development board

wifi to serial port = ESP12F

Cold start = MOS tube

Schematic diagram

PCB diagram

3D drawing of PCB

Software description

NodeMCU and ESP12F are developed using arduino IDE (1.8.10)

Download configuration diagram of arduino IDE, pay attention to press the FLA button when downloading

Of course, you can also download it using a BIN file. Pay attention to pressing the FLA button when downloading. The corresponding configuration diagram is as follows

Note that you need to lock the download baud rate of the STC-ISP software at 9600 when downloading.

The wiring diagram is as follows