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. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button. This board aims to provide a platform for innovative projects in smart IoT devices, wearable technology, high-tech automation, crazy. The Arduino Uno is a microcontroller board based on the ATmega328 (datasheet).
Depending on the state of these pins, the ESP32 will enter BOOT mode or FLASH mode at power on. Arduino Zero is a simple and powerful 32-bit extension of the platform established by the UNO. 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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