🧩 Raspberry Pi 5 GPIO Pinout Summary

Raspberry Pi 5 GPIO Pinout Summary

Pin #	Label	GPIO #	Function / Alt Function	Notes / Use
1	3.3 V	—	Power	3.3 V regulated output
2	5 V	—	Power	Direct 5 V input from USB-C
3	GPIO 2	SDA1	I²C bus 1 data	Default I²C (SDA)
4	5 V	—	Power	Same as Pin 2
5	GPIO 3	SCL1	I²C bus 1 clock	Default I²C (SCL)
6	GND	—	Ground	Common ground
7	GPIO 4	GPCLK0	General / Clock	Used for 1-Wire / clock out
8	GPIO 14	TXD0	UART0 TX	Serial transmit
9	GND	—	Ground	—
10	GPIO 15	RXD0	UART0 RX	Serial receive
11	GPIO 17	—	General	Common GPIO
12	GPIO 18	PCM_CLK / PWM0	Audio / PWM	PWM / Audio clock
13	GPIO 27	—	General	GPIO / input interrupt
14	GND	—	Ground	—
15	GPIO 22	—	General	Interrupt or logic control
16	GPIO 23	—	General	—
17	3.3 V	—	Power	—
18	GPIO 24	—	General	—
19	GPIO 10	MOSI	SPI0 MOSI	SPI bus data out
20	GND	—	Ground	—
21	GPIO 9	MISO	SPI0 MISO	SPI bus data in
22	GPIO 25	—	General	—
23	GPIO 11	SCLK	SPI0 SCLK	SPI clock
24	GPIO 8	CE0 N	SPI0 CE0	SPI chip select 0
25	GND	—	Ground	—
26	GPIO 7	CE1 N	SPI0 CE1	SPI chip select 1
27	GPIO 0	SDA0	I²C0 SDA	Reserved / camera
28	GPIO 1	SCL0	I²C0 SCL	Reserved / camera
29	GPIO 5	—	General	—
30	GND	—	Ground	—
31	GPIO 6	—	General	—
32	GPIO 12	PWM0	Audio left / PWM	—
33	GPIO 13	PWM1	Audio right / PWM	—
34	GND	—	Ground	—
35	GPIO 19	PCM_FS / SPI1 MISO	Audio / SPI	—
36	GPIO 16	—	General	—
37	GPIO 26	—	General	—
38	GPIO 20	PCM_DIN / SPI1 MOSI	Audio / SPI	—
39	GND	—	Ground	—
40	GPIO 21	PCM_DOUT / SPI1 SCLK	Audio / SPI	—

I²C bus 1: GPIO 2 (SDA1), GPIO 3 (SCL1) — used for sensors and OLEDs.
SPI bus 0: GPIO 7-11 — used for displays, ADCs, etc.
UART0: GPIO 14 (TX), GPIO 15 (RX) — for serial consoles or microcontrollers.
PWM channels: GPIO 12, 13, 18, 19 — control fans, servos, LEDs.
1-Wire: GPIO 4 — temperature sensors (DS18B20).
GPIO 17-27: Free for digital logic / inputs / outputs.

Now driven by the RP1 I/O controller, improving timing stability and interrupt handling.
All 40 pins are 3.3 V logic only (not 5 V tolerant).
Supports DMA-driven PWM, higher-speed SPI/I²C, and more consistent timing.
Maximum total GPIO current: ≈ 50 mA, so use transistors or relays for heavy loads.