The figure below shows the location of C15 highlighted in yellow. In case these issues occur, please remove the component. If you output clock on GPIO0, C15 may impact the signal The component C15 may cause the following issues on earlier ESP32-DevKitC V4 boards: Pin Layout ĮSP32-DevKitC Pin Layout (click to enlarge)  Note on C15  The boards with ESP32-WROVER modules have the pins reserved for internal use. The pins GPIO16 and GPIO17 are available for use only on the boards with the modules ESP32-WROOM and ESP32-SOLO-1. Avoid using these pins, as it may disrupt access to the SPI flash memory / SPI RAM. They are grouped on both sides near the USB connector.

The pins D0, D1, D2, D3, CMD and CLK are used internally for communication between ESP32 and SPI flash memory. The two tables below provide the Name and Function of I/O header pins on both sides of the board, as shown in ESP32-DevKitC V4 with ESP32-WROOM-32 module soldered. The power supply must be provided using one and only one of the options above, otherwise the board and/or the power supply source can be damaged. There are three mutually exclusive ways to provide power to the board: You can program ESP32 to enable multiple functions such as PWM, ADC, DAC, I2C, I2S, SPI, etc. Most of the pins on the ESP module are broken out to the pin headers on the board. For details see the schematics in Related Documents. Turns on when the USB or an external 5V power supply is connected to the board. Power supply for the board as well as the communication interface between a computer and the ESP32-WROOM-32 module. Single USB-UART bridge chip provides transfer rates of up to 3 Mbps. Holding down Boot and then pressing EN initiates Firmware Download mode for downloading firmware through the serial port. For more information, see ESP32-WROOM-32 Datasheet.ĭownload button. The following figure and the table below describe the key components, interfaces and controls of the ESP32-DevKitC V4 board.ĮSP32-DevKitC V4 with ESP32-WROOM-32 module soldered Ī module with ESP32 at its core. For details please refer to ESP Product Selector.

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