![]() Remember! You’ll have to make this connection every time you want to upload a new code. ![]() Once you have finished programming the board, you must disconnect this connection. When you connect GPIO 0 to GND, the ESP32 enters flash mode, and you can upload code to the board. This GPIO must be HIGH during boot and LOW during flashing, so it is internally pulled up by a 10K resistor. It determines whether or not the ESP32 is in flashing mode. GND is the ground pin.GPIO 0 is the most important pin. The 3V3 pin is the output from the on-board voltage regulator you can get up to 600mA from it. The VIN pin can be used to directly power the ESP32 and its peripherals, if you have a regulated 5V power supply. There are two power pins: the VIN pin and the 3V3 pin. The strapping pins function normally after reset release, but they should still be used with caution. However, if peripherals are connected to these pins, you may encounter issues when attempting to upload new code or flash the ESP32 with new firmware, as these peripherals prevent the ESP32 from entering the correct mode. On most development boards with built-in USB/Serial, you don’t need to worry about the state of these pins, as the board puts them in the correct state for flashing or boot mode. Depending on the state of these pins, the ESP32 will enter BOOT mode or FLASH mode at power on. These pins are used to put the ESP32 into BOOT mode (to run the program stored in the flash memory) or FLASH mode (to upload the program to the flash memory).
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