Notes on the ESP32-C3 GPIO usage – strapping pins, RTC domain pins, flash pins and tips on how to get maximum GPIOs for your design.
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design
ESP32 with passive PoE is very useful in several applications such as sensor nodes or industrial control units that use power over ethernet.
The ESP32 CH340 programmer schematic is described in brief in this article. This can be used for auto-programming both ESP32 and ESP8266.