Use this forum to chat about hardware specific topics for the ESP8266 (peripherals, memory, clocks, JTAG, programming)

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By martinayotte
#49119 As I said earlier, simply respect the boot process at reset or powerup : GPIO15 pulled-down, GPIO2/GPIO0 pulled-up.
When your application is started, you can then use those pins for something else, like having an LED on GPIO15 and having an I2C bus on GPIO2/GPIO0. Just make sure your attached hardware doesn't conflict with the boot process.