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Raspberry Pi Pico Rev3 pinout

Explore all 40 Raspberry Pi Pico Rev3 pins, including RP2040 GPIO, ADC, PWM, SPI, I2C, UART, PIO, power and debug connections.

Raspberry PiDevelopment boardRP2040Rev33.3 V logic2 × 20 pins26 usable GPIO

Fast answers

Which GPIO should I use?

Start with what you are connecting. Click any GPIO to locate it in the interactive diagram and inspect the full reason.

Interactive shortlist

Pin colour key

RecommendedUse with careAvoidSpecial case

Recommendation and GPIOsWhy

Easy choice

Input-capable, no declared boot warning, and suitable for the ESP32 internal pull resistor.

Add an external resistor

No matching pins declared

Excellent inputs, including ADC1, but these input-only pins have no internal pull-up or pull-down.

Works with care

No matching pins declared

These pins are sampled during boot or share the programming serial connection. Your button circuit must not force the wrong reset-time level.

Do not use

No matching pins declared

Connected to the module flash. Treat these header positions as reserved.

Reference by function

See only the pins relevant to your circuit.

Each view removes the unrelated labels, then keeps the exact channel, bus role, and assignment status beside the physical board position.

01 · GPIO

GPIO pins: safe, conditional and avoid

Green pins are the easiest general-purpose choices. Amber pins have a device or board caveat. Red pins are reserved by the board or module.

Pin colour key

GPIOADCI2CSPIUARTPWM

02 · ADC

ADC analogue inputs

Only analogue-capable connections are shown, with the exact converter and channel role declared by the source data.

Pin colour key

GPIOADCI2CSPIUARTPWM

03 · I2C

I²C data and clock

Default data and clock roles are labelled separately from routes that software can remap.

Pin colour key

GPIOADCI2CSPIUARTPWM

04 · SPI

SPI buses

Usable SPI routes are shown with their controller and signal roles. Pins marked avoid are excluded from this view.

A remappable peripheral still has electrical and boot restrictions. Remapping does not make a reserved pin safe.

Pin colour key

GPIOADCI2CSPIUARTPWM

05 · UART

UART serial ports

Transmit and receive pins are grouped by UART controller, with default and fixed assignments shown explicitly.

Pin colour key

GPIOADCI2CSPIUARTPWM

06 · PWM

PWM outputs

PWM can be routed to output-capable GPIOs. Input-only pins are not included because they cannot drive a PWM waveform.

Pin colour key

GPIOADCI2CSPIUARTPWM

A flexible RP2040 board

This reference covers the original, non-wireless Raspberry Pi Pico Rev3. Its two castellated 20-pin edges expose 26 multi-function RP2040 GPIOs, three of which also reach the analogue-to-digital converter.

Peripheral choices

RP2040 uses a regular pin-multiplexer pattern. Each exposed GPIO supports digital input, output, PWM, interrupts and PIO, while specific groups can be switched to SPI, I2C or UART roles. Select a bus in the explorer to see the exact role and controller attached to each pin.

Analogue inputs

GP26, GP27 and GP28 expose ADC0, ADC1 and ADC2. ADC_VREF and AGND are provided to improve analogue wiring. The fourth RP2040 ADC channel is used internally to measure the on-chip temperature sensor and is not a header GPIO.

Power pins

VBUS is the USB 5 V rail, VSYS is the board's system supply input, and 3V3(OUT) is the regulated output. Pulling 3V3_EN low disables the regulator. RUN is the RP2040 reset input. Treat these as distinct power-control connections rather than general GPIO.

Quick explanations

RP2040 pinout FAQ

Which RP2040 GPIO pins are the easiest to use?

Start with the pins marked recommended: GP0, GP1, GP2, GP3, GP4, GP5, GP6, GP7, GP8, GP9, GP10, GP11, GP12, GP13, GP14, GP15, GP28, GP27, GP26, GP22, GP21, GP20, GP19, GP18, GP17, GP16. They are declared as general-purpose GPIO without a board-specific boot, programming, or reserved-function warning in this reference. Always check the exact function you need before wiring.

Which pins can I use for a push button?

Use a recommended, input-capable GPIO. Check whether the selected pin provides an internal pull resistor or requires an external resistor.

Which analogue pins should I use while Wi-Fi is active?

Prefer the ADC1 pins: GP27. On this processor, ADC2 has a wireless-use conflict recorded in the pin definition, so ADC1 is the dependable starting point when radio operation and analogue sampling must coexist.

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Complete pin table

Every physical connection and declared alternate function is included here for accessibility, printing and search discovery.

Physical	Pin	Input / output	General suitability	Functions	Important notes
1	GP0	Input + Output	recommended	GPIO · fixed PWM · PWM0A · fixed Pio · remappable Interrupt · fixed SPI · RX · fixed I2C · SDA · fixed UART · TX · fixed
2	GP1	Input + Output	recommended	GPIO · fixed PWM · PWM0B · fixed Pio · remappable Interrupt · fixed SPI · CSn · fixed I2C · SCL · fixed UART · RX · fixed
3	GND	—	unavailable	Ground · fixed
4	GP2	Input + Output	recommended	GPIO · fixed PWM · PWM1A · fixed Pio · remappable Interrupt · fixed SPI · SCK · fixed I2C · SDA · fixed UART · CTS · fixed
5	GP3	Input + Output	recommended	GPIO · fixed PWM · PWM1B · fixed Pio · remappable Interrupt · fixed SPI · TX · fixed I2C · SCL · fixed UART · RTS · fixed
6	GP4	Input + Output	recommended	GPIO · fixed PWM · PWM2A · fixed Pio · remappable Interrupt · fixed SPI · RX · fixed I2C · SDA · fixed UART · TX · fixed
7	GP5	Input + Output	recommended	GPIO · fixed PWM · PWM2B · fixed Pio · remappable Interrupt · fixed SPI · CSn · fixed I2C · SCL · fixed UART · RX · fixed
8	GND	—	unavailable	Ground · fixed
9	GP6	Input + Output	recommended	GPIO · fixed PWM · PWM3A · fixed Pio · remappable Interrupt · fixed SPI · SCK · fixed I2C · SDA · fixed UART · CTS · fixed
10	GP7	Input + Output	recommended	GPIO · fixed PWM · PWM3B · fixed Pio · remappable Interrupt · fixed SPI · TX · fixed I2C · SCL · fixed UART · RTS · fixed
11	GP8	Input + Output	recommended	GPIO · fixed PWM · PWM4A · fixed Pio · remappable Interrupt · fixed SPI · RX · fixed I2C · SDA · fixed UART · TX · fixed
12	GP9	Input + Output	recommended	GPIO · fixed PWM · PWM4B · fixed Pio · remappable Interrupt · fixed SPI · CSn · fixed I2C · SCL · fixed UART · RX · fixed
13	GND	—	unavailable	Ground · fixed
14	GP10	Input + Output	recommended	GPIO · fixed PWM · PWM5A · fixed Pio · remappable Interrupt · fixed SPI · SCK · fixed I2C · SDA · fixed UART · CTS · fixed
15	GP11	Input + Output	recommended	GPIO · fixed PWM · PWM5B · fixed Pio · remappable Interrupt · fixed SPI · TX · fixed I2C · SCL · fixed UART · RTS · fixed
16	GP12	Input + Output	recommended	GPIO · fixed PWM · PWM6A · fixed Pio · remappable Interrupt · fixed SPI · RX · fixed I2C · SDA · fixed UART · TX · fixed
17	GP13	Input + Output	recommended	GPIO · fixed PWM · PWM6B · fixed Pio · remappable Interrupt · fixed SPI · CSn · fixed I2C · SCL · fixed UART · RX · fixed
18	GND	—	unavailable	Ground · fixed
19	GP14	Input + Output	recommended	GPIO · fixed PWM · PWM7A · fixed Pio · remappable Interrupt · fixed SPI · SCK · fixed I2C · SDA · fixed UART · CTS · fixed
20	GP15	Input + Output	recommended	GPIO · fixed PWM · PWM7B · fixed Pio · remappable Interrupt · fixed SPI · TX · fixed I2C · SCL · fixed UART · RTS · fixed
40	VBUS	—Output	unavailable	Power · USB 5 V rail · fixed
39	VSYS	Input + Output	unavailable	Power · system supply · fixed	• absolute maximum: 5.5 V input — VSYS board supply input
38	GND	—	unavailable	Ground · fixed
37	3V3_EN	Input	unavailable	Power · regulator enable · fixed	• Pull low to disable the 3.3 V regulator and RP2040
36	3V3(OUT)	—Output	unavailable	Power · regulated 3.3 V output · fixed
35	ADC_VREF	Input	unavailable	Power · ADC reference · fixed
34	GP28	Input + Output	recommended	GPIO · fixed ADC · ADC2 · 2 · fixed PWM · PWM6A · fixed Pio · remappable Interrupt · fixed SPI · RX · fixed I2C · SDA · fixed UART · TX · fixed
33	AGNDGND	—	unavailable	Ground · analogue ground · fixed
32	GP27	Input + Output	recommended	GPIO · fixed ADC · ADC1 · 1 · fixed PWM · PWM5B · fixed Pio · remappable Interrupt · fixed SPI · TX · fixed I2C · SCL · fixed UART · RTS · fixed
31	GP26	Input + Output	recommended	GPIO · fixed ADC · ADC0 · 0 · fixed PWM · PWM5A · fixed Pio · remappable Interrupt · fixed SPI · SCK · fixed I2C · SDA · fixed UART · CTS · fixed
30	RUN	Input	unavailable	Reset · active-low reset · fixed	• Pull low to reset RP2040
29	GP22	Input + Output	recommended	GPIO · fixed PWM · PWM3A · fixed Pio · remappable Interrupt · fixed SPI · SCK · fixed I2C · SDA · fixed UART · CTS · fixed
28	GND	—	unavailable	Ground · fixed
27	GP21	Input + Output	recommended	GPIO · fixed PWM · PWM2B · fixed Pio · remappable Interrupt · fixed SPI · CSn · fixed I2C · SCL · fixed UART · RX · fixed
26	GP20	Input + Output	recommended	GPIO · fixed PWM · PWM2A · fixed Pio · remappable Interrupt · fixed SPI · RX · fixed I2C · SDA · fixed UART · TX · fixed
25	GP19	Input + Output	recommended	GPIO · fixed PWM · PWM1B · fixed Pio · remappable Interrupt · fixed SPI · TX · fixed I2C · SCL · fixed UART · RTS · fixed
24	GP18	Input + Output	recommended	GPIO · fixed PWM · PWM1A · fixed Pio · remappable Interrupt · fixed SPI · SCK · fixed I2C · SDA · fixed UART · CTS · fixed
23	GND	—	unavailable	Ground · fixed
22	GP17	Input + Output	recommended	GPIO · fixed PWM · PWM0B · fixed Pio · remappable Interrupt · fixed SPI · CSn · fixed I2C · SCL · fixed UART · RX · fixed
21	GP16	Input + Output	recommended	GPIO · fixed PWM · PWM0A · fixed Pio · remappable Interrupt · fixed SPI · RX · fixed I2C · SDA · fixed UART · TX · fixed

Which GPIO should I use?

See only the pins relevant to your circuit.

GPIO pins: safe, conditional and avoid

ADC analogue inputs

I²C data and clock

SPI buses

UART serial ports

PWM outputs

A flexible RP2040 board

Peripheral choices

Analogue inputs

Power pins

RP2040 pinout FAQ

Complete pin table

Raspberry Pi Pico Rev3 project