esp-idf/examples/get-started/blink/main/Kconfig.projbuild

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menu "Example Configuration"
config BLINK_GPIO
int "Blink GPIO number"
range 0 34
default 5
help
GPIO number (IOxx) to blink on and off.
Some GPIOs are used for other purposes (flash connections, etc.) and cannot be used to blink.
GPIOs 35-39 are input-only so cannot be used as outputs.
endmenu