Copied ESP32-S2-Saola-1 board, changed ttl to ch340c, added tx rx indicator lights, all placed on the back, patterned windows on the front, need to solder the LED on the back
PS: The current price-performance ratio of esp32 is really high, especially stm32 is sky-highly expensive. esp32 has many peripherals, is modular, and integrates many basic hardware. Except for relatively few ios, it beats stm32 in all aspects, and the s2 version has also been added. After losing the number of ios, I switched to esp32. I can’t afford stm32 anymore.
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