ESP32-S3-DevKitC-1 pinout

Espressif's own ESP32-S3 board: Wi-Fi, Bluetooth LE, two USB ports and an RGB LED. Breadboard friendly, 3.3 V logic.

Top view, USB connector on the left. Colors: red power, grey ground, green GPIO, yellow analog, orange USB serial, blue I2C.

At a glance

Chip: ESP32-S3 (ESP32-S3-WROOM-1-N8R8)
Processor: Dual-core Xtensa LX7 at 240 MHz, 512 KB SRAM, 8 MB flash, 8 MB octal PSRAM, Wi-Fi and Bluetooth LE
Logic level: 3.3 V. Not 5 V tolerant unless marked below.
Flashing tool: esptool
Arduino board (FQBN): esp32:esp32:esp32s3
Live pin view in BoardPilot: Yes (diagnostic agent available)

Pins to avoid or use with care

Flash memory: 37, 36, 35

Wired to the flash memory. Never use them.

Boot-critical strapping pins: 45

A wrong level at reset stops the board from booting.

Strapping pins: 3, 46, 0

Their level at reset changes how the board boots. Usually fine after boot.

USB serial: TX (GPIO43), RX (GPIO44)

Used for uploading and the serial monitor. Anything connected here can break uploads.

Native USB: 20, 19

The USB data lines. Using them breaks USB uploads and the serial monitor.

Good pins for LEDs, buttons and signals

4, 5, 6, 7, 15, 16, 17, 18, 21, 47, 1, 2, 14

Default pins in Arduino

I2C: SDA = 8, SCL = 9. Any output-capable pins work with Wire.begin(sda, scl). Any GPIO can be I2C on the ESP32-S3. Arduino's Wire uses GPIO 8 (SDA) and GPIO 9 (SCL) by default.
SPI: MOSI = 11, MISO = 13, SCK = 12, CS = 10.
Analog inputs: 1, 2, 4, 5, 6, 7, 10, 3, 8, 9 (0–3.3 V)

How to flash it

Use the port labelled UART. If uploading does not start, hold BOOT, press and release RESET, then release BOOT.

All 44 pins

Pin	GPIO	Chip pin	Functions	Notes
3V3	—		3V3	3.3 V from the on-board regulator. You can feed 3.3 V in here instead of USB, but never both at once.
3V3	—		3V3	Same 3.3 V rail as the other 3V3 pin.
RST	—		CHIP_PU	Reset. Pulling it LOW restarts the chip (same as the RESET button).
4	4		GPIO, RTC_GPIO4, TOUCH4, ADC1_CH3
5	5		GPIO, RTC_GPIO5, TOUCH5, ADC1_CH4
6	6		GPIO, RTC_GPIO6, TOUCH6, ADC1_CH5
7	7		GPIO, RTC_GPIO7, TOUCH7, ADC1_CH6
15	15		GPIO, RTC_GPIO15, U0RTS, ADC2_CH4, XTAL_32K_P
16	16		GPIO, RTC_GPIO16, U0CTS, ADC2_CH5, XTAL_32K_N
17	17		GPIO, RTC_GPIO17, U1TXD, ADC2_CH6
18	18		GPIO, RTC_GPIO18, U1RXD, ADC2_CH7, CLK_OUT3
8	8		GPIO, RTC_GPIO8, TOUCH8, ADC1_CH7, SUBSPICS1, I2C_SDA (default)	Arduino's default I2C SDA pin on the ESP32-S3.
3	3		GPIO, RTC_GPIO3, TOUCH3, ADC1_CH2	Strapping pin for the JTAG source. It is ignored unless special eFuses are burned, so it is normally fine to use.
46	46		GPIO	Strapping pin: keep it LOW (its default) at reset, or uploading may fail.
9	9		GPIO, RTC_GPIO9, TOUCH9, ADC1_CH8, FSPIHD, SUBSPIHD, I2C_SCL (default)	Arduino's default I2C SCL pin on the ESP32-S3.
10	10		GPIO, RTC_GPIO10, TOUCH10, ADC1_CH9, FSPICS0, FSPIIO4, SUBSPICS0, SPI_CS (default)
11	11		GPIO, RTC_GPIO11, TOUCH11, ADC2_CH0, FSPID, FSPIIO5, SUBSPID, SPI_MOSI (default)
12	12		GPIO, RTC_GPIO12, TOUCH12, ADC2_CH1, FSPICLK, FSPIIO6, SUBSPICLK, SPI_SCK (default)
13	13		GPIO, RTC_GPIO13, TOUCH13, ADC2_CH2, FSPIQ, FSPIIO7, SUBSPIQ, SPI_MISO (default)
14	14		GPIO, RTC_GPIO14, TOUCH14, ADC2_CH3, FSPIWP, FSPIDQS, SUBSPIWP
5V	—		5V	5 V from the USB ports. You can power the board here with 5 V instead of USB, but never both at once.
G	—		GND
G	—		GND
TX	43	GPIO43	GPIO, U0TXD, CLK_OUT1	USB serial TX through the CP2102N (port labelled UART). Used for uploading and the serial monitor.
RX	44	GPIO44	GPIO, U0RXD, CLK_OUT2	USB serial RX through the CP2102N (port labelled UART). Used for uploading and the serial monitor.
1	1		GPIO, RTC_GPIO1, TOUCH1, ADC1_CH0
2	2		GPIO, RTC_GPIO2, TOUCH2, ADC1_CH1
42	42		GPIO, MTMS
41	41		GPIO, MTDI, CLK_OUT1
40	40		GPIO, MTDO, CLK_OUT2
39	39		GPIO, MTCK, CLK_OUT3, SUBSPICS1
38	38		GPIO, FSPIWP, SUBSPIWP, RGB_LED	Drives the RGB LED on v1.1 boards. Arduino's RGB_BUILTIN points to GPIO 48 (the v1.0 LED pin), so use 38 for this LED.
37	37		GPIO, SPIDQS, FSPIQ, SUBSPIQ	Used inside the module by the octal PSRAM (N8R8 and other R8 / R16V boards). Not available: do not use.
36	36		GPIO, SPIIO7, FSPICLK, SUBSPICLK	Used inside the module by the octal PSRAM (N8R8 and other R8 / R16V boards). Not available: do not use.
35	35		GPIO, SPIIO6, FSPID, SUBSPID	Used inside the module by the octal PSRAM (N8R8 and other R8 / R16V boards). Not available: do not use.
0	0		GPIO, RTC_GPIO0	Strapping pin wired to the BOOT button: LOW at reset starts upload mode instead of your program.
45	45		GPIO	Strapping pin: HIGH at reset selects 1.8 V flash voltage, so the board may not boot. Keep it LOW or floating at reset.
48	48		GPIO, SPICLK_N, SUBSPICLK_N_DIFF	Free on v1.1 boards. On the older v1.0 board this pin drives the RGB LED.
47	47		GPIO, SPICLK_P, SUBSPICLK_P_DIFF
21	21		GPIO, RTC_GPIO21
20	20		GPIO, RTC_GPIO20, U1CTS, ADC2_CH9, CLK_OUT1, USB_D+	Native USB D+ (the port labelled USB). Using it breaks that USB port.
19	19		GPIO, RTC_GPIO19, U1RTS, ADC2_CH8, CLK_OUT2, USB_D-	Native USB D- (the port labelled USB). Using it breaks that USB port.
G	—		GND
G	—		GND

Check your wiring with BoardPilot

BoardPilot shows this board in 3D, flags risky pins as you wire, and flashes it safely with a backup first.

Download BoardPilot

Sources

ESP32-S3-DevKitC-1 v1.1 user guide, Header Block (J1, J3), Description of Components, Hardware Revision Details
ESP32-S3-DevKitC-1 v1.1 schematic (2022-11-30), Sheet 2: CP2102N-A02, two micro-USB connectors, RGB LED on GPIO38, BOOT on GPIO0
ESP32-S3-DevKitC-1 v1.1 dimensions (DXF 2022-04-29), Board outline, header pad centres, component outlines
ESP32-S3 Series Datasheet v2.2, 3 Boot Configurations (strapping pins GPIO0, 3, 45, 46; Tables 3-1, 3-3, 3-4, 3-5)
ESP32-S3-WROOM-1 / 1U Datasheet v1.8, Pin Definitions note b: IO35-37 used by octal PSRAM; Table 1-1 ordering codes
ESP-IDF Programming Guide (ESP32-S3), ADC Oneshot: Hardware Limitations (ADC2 is also used by Wi-Fi)
arduino-esp32 variants/esp32s3/pins_arduino.h, SDA 8, SCL 9, SS 10, MOSI 11, MISO 13, SCK 12, PIN_RGB_LED 48, USB 303a:1001
Board data file and source notes on GitHub

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