I already installed (ESP32 by Espressif Systems) but I can't find it when I refer to the examples. How can I find it?
You need to select one of the ESP32 boards in board manager, then they will appear.
Topic moved. Please do not post in "Uncategorized"; see the sticky topics in Uncategorized - Arduino Forum.
The (inappropriate) screen shot shows that an AVR _ Arduino Uno is selected!!
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