Is the Pico W pinout the same as the Pico?

The 40 header pins are the same. Inside, the Pico W uses GP23, GP24, GP25 and GP29 for its wireless chip (GP29 still reads VSYS/3, but only while GP25 is high), its LED hangs off the wireless chip rather than GP25, and the SWD debug pads move to the middle of the board.

How many ADC pins does the Raspberry Pi Pico have?

Three on the header: GP26, GP27 and GP28 (ADC0 to ADC2). The RP2040 also measures VSYS/3 on ADC3 and its own temperature sensor on ADC4.

Can I power the Pico from 5 V?

Yes. Feed 5 V into VSYS (pin 39), which accepts 1.8 V to 5.5 V, or into VBUS (pin 40). Never put 5 V on a GPIO or the 3V3 pin.

Raspberry Pi Pico Pinout

Raspberry Pi Pico (RP2040) · 40-pin module, 2.54 mm pitch, castellated

The Pico puts the RP2040 on a 40-pin board: 26 of its 30 GPIO on the edge, three of them with an ADC, plus power pins that let it run from USB, a battery or an external rail.

Checked against the KiCad library and datasheet on 16 October 2026

Raspberry Pi Pico (RP2040) pinout: KiCad footprint Module:RaspberryPi_Pico_Common_THT seen from the top, beside the KiCad library symbol MCU_Module:RaspberryPi_Pico with every pin number and name — Left, the Pico's 40-pin footprint with the USB end at the top: pins 1 to 20 down the left, 21 to 40 back up the right; the square pads are pin 1 and the grounds. Right, KiCad's symbol, which stacks all the GND pins into the one marked 3. Exported from the KiCad 9 libraries (MCU_Module:RaspberryPi_Pico, Module:RaspberryPi_Pico_Common_THT). Open full size

Pin by pin

Pin	Name	Function
1	GP0	SPI0 RX · UART0 TX · I²C0 SDA · PWM0 A
2	GP1	SPI0 CSn · UART0 RX · I²C0 SCL · PWM0 B
3	GND	Ground
4	GP2	SPI0 SCK · UART0 CTS · I²C1 SDA · PWM1 A
5	GP3	SPI0 TX · UART0 RTS · I²C1 SCL · PWM1 B
6	GP4	SPI0 RX · UART1 TX · I²C0 SDA · PWM2 A
7	GP5	SPI0 CSn · UART1 RX · I²C0 SCL · PWM2 B
8	GND	Ground
9	GP6	SPI0 SCK · UART1 CTS · I²C1 SDA · PWM3 A
10	GP7	SPI0 TX · UART1 RTS · I²C1 SCL · PWM3 B
11	GP8	SPI1 RX · UART1 TX · I²C0 SDA · PWM4 A
12	GP9	SPI1 CSn · UART1 RX · I²C0 SCL · PWM4 B
13	GND	Ground
14	GP10	SPI1 SCK · UART1 CTS · I²C1 SDA · PWM5 A
15	GP11	SPI1 TX · UART1 RTS · I²C1 SCL · PWM5 B
16	GP12	SPI1 RX · UART0 TX · I²C0 SDA · PWM6 A
17	GP13	SPI1 CSn · UART0 RX · I²C0 SCL · PWM6 B
18	GND	Ground
19	GP14	SPI1 SCK · UART0 CTS · I²C1 SDA · PWM7 A
20	GP15	SPI1 TX · UART0 RTS · I²C1 SCL · PWM7 B
21	GP16	SPI0 RX · UART0 TX · I²C0 SDA · PWM0 A
22	GP17	SPI0 CSn · UART0 RX · I²C0 SCL · PWM0 B
23	GND	Ground
24	GP18	SPI0 SCK · UART0 CTS · I²C1 SDA · PWM1 A
25	GP19	SPI0 TX · UART0 RTS · I²C1 SCL · PWM1 B
26	GP20	SPI0 RX · UART1 TX · I²C0 SDA · PWM2 A
27	GP21	SPI0 CSn · UART1 RX · I²C0 SCL · PWM2 B
28	GND	Ground
29	GP22	SPI0 SCK · UART1 CTS · I²C1 SDA · PWM3 A
30	RUN	RP2040 reset, active low. Pull to GND to restart the chip
31	GP26	ADC0 · SPI1 SCK · UART1 CTS · I²C1 SDA · PWM5 A
32	GP27	ADC1 · SPI1 TX · UART1 RTS · I²C1 SCL · PWM5 B
33	AGND	Analog ground for the ADC
34	GP28	ADC2 · SPI1 RX · UART0 TX · I²C0 SDA · PWM6 A
35	ADC_VREF	ADC reference, a filtered 3.3 V on the board
36	3V3(OUT)	3.3 V from the on-board regulator. Keep loads under 300 mA
37	3V3_EN	Pulled up to VSYS (100 kΩ); pull low to switch the 3.3 V regulator off, which also powers down the RP2040
38	GND	Ground
39	VSYS	Main supply in, 1.8 V to 5.5 V
40	VBUS	USB 5 V, present only while USB is plugged in

Things that catch people out

GPIO are 3.3 V only and not 5 V tolerant. The ADC inputs (GP26 to GP28) have diodes to 3.3 V: keep them below it, and never drive them while the Pico is unpowered.
Physical pin and GPIO numbers differ: GP0 is pin 1, but GP2 is pin 4 because pin 3 is a ground.
GP23, GP24, GP25 and GP29 never reach the header. The board uses them for the regulator's mode, VBUS sensing, the LED and a VSYS/3 measurement on ADC3.
Each GPIO can take any of the functions listed for it. The SDK's defaults are UART0 on GP0/GP1, I²C0 on GP4/GP5 and SPI0 on GP16 to GP19.
To run from a battery on VSYS with USB also plugged in, feed the battery through a Schottky diode (or a P-MOSFET) so the two supplies cannot back-feed each other.

Putting the Raspberry Pi Pico (RP2040) on a PCB

As a module on your board: two rows of 20 at 2.54 mm pitch, 17.78 mm apart, 1.0 mm holes (KiCad Module:RaspberryPi_Pico_Common_THT). Or use the SMD footprint and solder the castellated edges flat.
Seven GND pins and AGND run down both sides. Tie every one to your ground plane rather than picking one.
Keep the three SWD debug pads (SWCLK, GND, SWDIO) reachable if you will ever need a debugger: on the Pico they are at the end opposite USB, on the Pico W mid-board. The Pico W's antenna is at the end opposite USB: keep copper and metal away from it.

Common questions

Is the Pico W pinout the same as the Pico?: The 40 header pins are the same. Inside, the Pico W uses GP23, GP24, GP25 and GP29 for its wireless chip (GP29 still reads VSYS/3, but only while GP25 is high), its LED hangs off the wireless chip rather than GP25, and the SWD debug pads move to the middle of the board.
How many ADC pins does the Raspberry Pi Pico have?: Three on the header: GP26, GP27 and GP28 (ADC0 to ADC2). The RP2040 also measures VSYS/3 on ADC3 and its own temperature sensor on ADC4.
Can I power the Pico from 5 V?: Yes. Feed 5 V into VSYS (pin 39), which accepts 1.8 V to 5.5 V, or into VBUS (pin 40). Never put 5 V on a GPIO or the 3V3 pin.

Describe the board the Pico plugs into and PCBEditor builds the schematic and a routed board around its 40 pins, grounds and power pins included.

Design a Pico carrier board →

Sources

Raspberry Pi Pico datasheet
RP2040 datasheet (GPIO function table)
KiCad 9 libraries: symbol MCU_Module:RaspberryPi_Pico, footprint Module:RaspberryPi_Pico_Common_THT (CC-BY-SA 4.0).