40-Pin GPIO Header

The Radxa NX4 IO Board features an onboard 40-Pin GPIO (General Purpose Input/Output) header, providing a highly flexible interface for hardware expansion.

You can use the 40-Pin GPIO header to connect sensors, actuators, communication modules, displays, and other embedded peripherals, enabling rapid prototyping and functional validation for IoT, robotics control, and industrial automation.

Usage Notes

When using the 40-Pin GPIO header, pay attention to the wiring between pins and peripherals. Ensure all connections are correct—improper operation may damage the hardware.

GPIO Functions

GPIO number	Function5	Function4	Function3	Function2	Function1	Voltage	Pin#	Pin#	Voltage	Function1	Function2	Function3	Function4	Function5	Function6	GPIO number
						3.3V	1	2	5V
55			I2C8_SDA_M1	UART2_RX_M0	GPIO1_C7	3.3V	3	4	5V
54			I2C8_SCL_M1	UART2_TX_M0	GPIO1_C6	3.3V	5	6	GND
51		SPI2_CSN0_M1			GPIO1_C3	3.3V	7	8	3.3V	GPIO4_B4	UART2_RX_M1				CAN1_RX_M2	140
						GND	9	10	3.3V	GPIO4_B5	UART2_TX_M1				CAN1_TX_M2	141
52		SPI2_MOSI_M1		UART4_TX_M1	GPIO1_C4	3.3V	11	12	3.3V	GPIO1_D1	UART10_RX_M1					57
80	PWM1_CH0_M2				GPIO2_C0	3.3V	13	14	GND
53		SPI2_MISO_M1		UART4_RX_M1	GPIO1_C5	3.3V	15	16	3.3V	GPIO2_B6	UART7_TX_M0					78
						3.3V	17	18	3.3V	GPIO2_B7	UART7_RX_M0					79
45	PWM1_CH1_M1	SPI1_MOSI_M0			GPIO1_B5	3.3V	19	20	GND
46		SPI1_MISO_M0			GPIO1_B6	3.3V	21	22	3.3V	GPIO2_D7				PWM2_CH7_M2		95
44	PWM1_CH0_M1	SPI1_CLK_M0			GPIO1_B4	3.3V	23	24	3.3V	GPIO1_B7			SPI1_CSN0_M0			47
						GND	25	26	3.3V	GPIO1_C0	UART3_TX_M2		SPI1_CSN1_M0	PWM0_CH0_M1		48
151			I2C6_SDA_M3		GPIO4_C7	3.3V	27	28	3.3V	GPIO4_C6		I2C6_SCL_M3				150
98					GPIO3_A2	3.3V	29	30	GND
49				UART3_RX_M2	GPIO1_C1	3.3V	31	32	3.3V	GPIO1_D5			SPI2_CLK_M1			61
50	PWM1_CH2_M1	SPI2_CSN1_M1			GPIO1_C2	3.3V	33	34	GND
58	PWM1_CH3_M1				GPIO1_D2	3.3V	35	36	3.3V	GPIO1_D4						60
99					GPIO3_A3	3.3V	37	38	3.3V	GPIO1_D3				PWM1_CH4_M1		59
						GND	39	40	3.3V	GPIO1_D0	UART10_TX_M1					56