Raspberry Pi Pico Pinout Diagram and Raspberry Pi Pico W

Raspberry Pi is a single-board computer. There are so many versions available in the Raspberry Pi series. The Raspberry Pi Pico was released in January 2021. It was the first board launched by the Raspberry Pi Foundation that is based upon a single microcontroller chip(RP2040). The main drawback of the Raspberry Pi Pico was there was no wireless connectivity function. So later in June 2022, the Raspberry Pi Pico W was launched. Here the W referees the WiFi technology. Even it supports Bluetooth technology also. 

It supports 2.4GHz WiFi with an onboard antenna. Due to its wireless connectivity function, it is very easy and compatible to use with IoT systems. Here, we are going to see the pinout diagram of both Raspberry Pi Pico and Pico W. Both of them have the same number of pins and the same function also.

Here, you can see the pinout diagram of Raspberry Pi Pico and Pico W(both are the same)

Raspberry Pi pico pinout diagram, Raspberry Pi Pico W pinout diagram

You can see the board has a total of 40 pins. These 40 pins can be divided into different categories.

Power Supply Pins

It operates with 3.3V and 5V. It has an onboard SMPS circuit also that converts the voltage to its operating voltage. When we plug in with a USB it gets almost 5V. So the SMPS circuit decreases it to 3.3V when required. When a power supply is provided by an external circuit through its GPIO pins the voltage should not be greater than 5V. It not only has the power input but it has a power output pin also that provides 3.3V. You can see pins no 36, 39, and 40 are the power pins where 36 is the power output pin.

Pin no 40 VBus is internally connected to the USB pin. So the board is powered by USB, here also 5V available. Or we can give the power supply from an external source through this pin.

Pin no 39 Vsys is the system voltage pin. Here, also external power supply can be applied with 1.8V to 5.5V. It is connected to the onboard SMPS so it will convert the voltage into 3.3V before being provided to the system.

Ground Pins

It has a total of eight number ground pins - 3,8,13,18,23,28,33,38. Actually, all the ground pins are internally connected to each other.

UART(Default) Pins

There are two UART default pins - pin no 1 and 2. That are named as UART0 TX and UART0 RX.


Pin No 6,7,11,12,16,17,21,22


It has 26 numbers of GPIO pins that can be used for multifunction with 3.3V.

Test Pins

The Raspberry Pi Pico has some surface-mounted pins that can be used for testing. These are

TP1 - Ground for differential USB signals



TP4 - WL_GPIO1/SMPS PS Pin(not recommended to use)

TP5 - WL_GPIO0/LED(not recommended to use)


So, the TP 1-3 pins can be used to access the USB signals instead of using the micro USB port.

Other Pins

It has two SPI pins, two I2C pins, three ADC Pins, and sixteen controllable PWM pins associated with GPIO pins.

Pin no 35 ADC_VREF is used for the ADC and its reference power supply.

Also, there are some internal GPIO pins(GPIO26-29) available that are used by the RP2040 microcontroller chip. Pin no 33 AGND is the ground reference pin for those internal GPIO pins.

Pin no 37 3V3_EN is for the SMPS enable. When this pin is high the SMPS will be enabled and when this pin is low the SMPS will be disabled.

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Raspberry Pi Pico Pinout Diagram and Raspberry Pi Pico W Raspberry Pi Pico Pinout Diagram and Raspberry Pi Pico W Reviewed by Author on 11/23/2022 Rating: 5