docs.espressif.com/projects/esp-idf/en/release-v4.2/esp32/hw-reference/esp32/get-started-devkitc.html
docs.espressif.com/projects/esp-idf/en/release-v4.2/esp32/hw-reference/modules-and-boards.html#esp-modules-and-boards-esp32-wroom-32d-and-u