Pinout Reference

The ESP32-P4-WIFI6-DEV-KIT exposes a 40-pin (2x20) GPIO header at 2.54 mm pitch. This page documents every pin on the header.

Pin legend

Pin functions are color-coded by type:

• Power (3.3 V / 5 V)
• Ground (GND)
• General-purpose GPIO
• I2C bus (SDA / SCL)
• UART (TX / RX)

40-pin header map

Pin 1 is at the top-left corner of the header (closest to the board edge near the Ethernet jack). Left column is odd-numbered, right column is even-numbered.

Pin	Left Function		Right Function	Pin
1	3V3		5V	2
3	SDA / GPIO7		5V	4
5	SCL / GPIO8		GND	6
7	GPIO23		TXD / GPIO37	8
9	GND		RXD / GPIO38	10
11	GPIO21		GPIO22	12
13	GPIO20		GND	14
15	GPIO6		GPIO5	16
17	3V3		GPIO4	18
19	GPIO3		GND	20
21	GPIO2		GPIO1	22
23	GPIO0		GPIO36	24
25	GND		GPIO32	26
27	GPIO24		GPIO25	28
29	GPIO33		GND	30
31	GPIO26		GPIO54	32
33	GPIO48		GND	34
35	GPIO53		GPIO46	36
37	GPIO47		GPIO27	38
39	GND		GPIO45	40

Power pins

The header provides both 3.3 V and 5 V power rails:

Pin(s)	Voltage	Notes
1, 17	3.3 V	Regulated 3.3 V output from onboard regulator. Max draw depends on total board load.
2, 4	5 V	Direct from USB input. Available when powered via either USB-C port.
6, 9, 14, 20, 25, 30, 34, 39	GND	Common ground reference.

Caution

The 5 V pins are connected directly to the USB power input. They are not regulated or current-limited beyond the USB source. Drawing excessive current from these pins can cause voltage drops that destabilize the board.

I2C pins

Function	Pin	GPIO
SDA	3	GPIO7
SCL	5	GPIO8

These are the default I2C bus pins, shared with the dedicated I2C port connector on the board. If you connect I2C devices to both the header and the I2C port connector simultaneously, they will be on the same bus.

UART pins

Function	Pin	GPIO
TXD	8	GPIO37
RXD	10	GPIO38

Note

These UART pins are independent of the USB-C UART port (component 17), which uses a CH343 bridge on separate internal GPIOs. The header UART is available for connecting to external serial devices.

GPIO capabilities

All GPIO pins on the header support:

• Digital input and output
• Internal pull-up and pull-down resistors
• Edge and level interrupts

Specific pins may also support analog input (ADC), PWM output, or alternate peripheral functions depending on the ESP32-P4 multiplexing configuration. Consult the ESP32-P4 Technical Reference Manual for the full pin multiplexing matrix.

Caution

GPIO53 (pin 35) is used internally as the PA_Ctrl signal for the NS4150B audio amplifier. If you use the onboard speaker output, do not repurpose this pin. If the speaker is not in use, GPIO53 is available as a general-purpose output.

Pin summary by type

Type	Count	Pins
3.3 V Power	2	1, 17
5 V Power	2	2, 4
Ground	8	6, 9, 14, 20, 25, 30, 34, 39
I2C	2	3 (SDA), 5 (SCL)
UART	2	8 (TXD), 10 (RXD)
GPIO	24	7, 11-13, 15-16, 18-19, 21-24, 26-29, 31-33, 35-38, 40

---

Pin assignments sourced from the Waveshare ESP32-P4-WIFI6-DEV-KIT Wiki.