https://pico.pinout.xyz/

Raspberry Pi Pico Pinout

Interactive, accessible & beautiful GPIO pinout and pin function
guide for the Raspberry Pi Pico

  * [ ]Advanced
  * [ ]Rear View

  * [*]SPI
  * [*]I2C
  * [*]PWM
  * [*]UART

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Pin  Name    SPI      I2C      UART     PWM

 1  GP0    SPI0 RX  I2C0 SDA UART0 TX  PWM0 A

 2  GP1    SPI0 CSn I2C0 SCL UART0 RX  PWM0 B

 3  Ground

 4  GP2    SPI0 SCK I2C1 SDA UART0 CTS PWM1 A

 5  GP3    SPI0 TX  I2C1 SCL UART0 RTS PWM1 B

 6  GP4    SPI0 RX  I2C0 SDA UART1 TX  PWM2 A

 7  GP5    SPI0 CSn I2C0 SCL UART1 RX  PWM2 B

 8  Ground

 9  GP6    SPI0 SCK I2C1 SDA UART1 CTS PWM3 A

10  GP7    SPI0 TX  I2C1 SCL UART1 RTS PWM3 B

11  GP8    SPI1 RX  I2C0 SDA UART1 TX  PWM4 A

12  GP9    SPI1 CSn I2C0 SCL UART1 RX  PWM4 B

13  Ground

14  GP10   SPI1 SCK I2C1 SDA UART1 CTS PWM5 A

15  GP11   SPI1 TX  I2C1 SCL UART1 RTS PWM5 B

16  GP12   SPI1 RX  I2C0 SDA UART0 TX  PWM6 A

17  GP13   SPI1 CSn I2C0 SCL UART0 RX  PWM6 B

18  Ground

19  GP14   SPI1 SCK I2C1 SDA UART0 CTS PWM7 A

20  GP15   SPI1 TX  I2C1 SCL UART0 RTS PWM7 B

Raspberry Pi Pico with the micro USB port facing upwards, standing
face-up on its GPIO pins.
Raspberry Pi Pico with the micro USB port facing downwards, standing
bottom-up on its GPIO pins.

Pin Name/ADC    SPI      I2C      UART     PWM

40  VBUS

39  VSYS

38  Ground

37  3V3 En

36  3V3 Out

35  ADC VRef

34  GP28 / A2 SPI1 RX  I2C0 SDA UART0 TX  PWM6 A

33  ADC Gnd

32  GP27 / A1 SPI1 TX  I2C1 SCL UART1 RTS PWM5 B

31  GP26 / A0 SPI1 SCK I2C1 SDA UART1 CTS PWM5 A

30  RUN

29  GP22      SPI0 SCK I2C1 SDA UART1 CTS PWM3 A

28  Ground

27  GP21      SPI0 CSn I2C0 SCL UART1 RX  PWM2 B

26  GP20      SPI0 RX  I2C0 SDA UART1 TX  PWM2 A

25  GP19      SPI0 TX  I2C1 SCL UART0 RTS PWM1 B

24  GP18      SPI0 SCK I2C1 SDA UART0 CTS PWM1 A

23  Ground

22  GP17      SPI0 CSn I2C0 SCL UART0 RX  PWM0 B

21  GP16      SPI0 RX  I2C0 SDA UART0 TX  PWM0 A

SWCLK GND SWDIO

  Pin         Function                         Notes
GP23    RT6150B-33GQW         LOW (default) for high efficiency (PFM)
        Power-Select          HIGH for improved ripple (PWM)
GP24    VBUS Sense            Detect USB power or VBUS pin
GP25    User LED
GP29 /  VSYS Sense            Read VSYS/3 through resistor divider
A3                            and FET Q1
A4      Temperature           Read onboard temperature sensor

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Raspberry Pi Pico Pinout is maintained by @Gadgetoid.

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