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A simple ESP32 or ESP8266 Programming Board This ESP32 or ESP8266 programming board is self powered only. The board that is being programmed must be self powered.
How to connect the programmer to an ESP32
More detaild: https://github.com/mike-rankin/ESP32-ESP8266-Programmer This project is reposted with the approval of this project creator. He is a good DIY maker who designs custom ESP32 IoT projects using Altium Designer, Arduino IDE and Fusion360. Welcome everyone to follow him. This is his GitHub account, Mike Rankin, where you will explore more excellent projects.