The Arduino Nano RP2040 Connect

The Pico's RP2040 on the classic Nano outline, with the Nano's pin names and an LED on D13.

What it is

The same RP2040 as the Raspberry Pi Pico, a Cortex-M0+, on a board 45 by 18 mm with two fifteen-pin rows 0.6 inch apart. The real board also carries a u-blox NINA-W102 radio module, an LSM6DSOX IMU, a crypto chip and a PDM microphone. Mokxi runs the RP2040 and its pins, and none of the others.

Pin numbers: by GPIO number

Mokxi builds this board the way the arduino-pico core's "Arduino Nano RP2040 Connect" does: a bare number is a GPIO, and the Nano's names are defined as GPIO numbers. So write D13, A0 and LED_BUILTIN, not bare numbers. Arduino's own Mbed core numbers the pins the Arduino way instead; the names mean the same pins under both.

Pin	GPIO	Also
RX (D0)	1	UART RX
TX (D1)	0	UART TX
D2	25
D3 to D9	15 to 21
D10	5	SPI SS
D11	7	SPI MOSI
D12	4	SPI MISO
D13	6	SPI SCK, the LED
A0 to A3	26 to 29
A4, A5	12, 13	I2C SDA, SCL
A6, A7	none	the radio module's

What is left open

A6 and A7 are pins of the NINA-W102, not of the RP2040, so they are open. 5V carries the USB rail only once the board's VUSB jumper is bridged, which it is not out of the box, so it is open too, as are VIN and AREF. Both RESET pins hold the chip in reset when pulled low.

The LED

LED_BUILTIN is the LED on D13 (GPIO 6), which lights when the pin is HIGH. The RGB LED on the real board belongs to the radio module and stays dark.

What is not modeled

The NINA-W102 (WiFi, Bluetooth and the RGB LED: WiFiNINA.h has nothing to talk to), the LSM6DSOX and the crypto chip on the I2C bus (nothing answers at their addresses) and the PDM microphone.

The RP2040's ADC is modeled, as on the Pico: analogRead() on A0 to A3 reads the voltage on the net, ten bits against 3.3 V by default. A4 and A5 are GPIO 12 and 13, with no converter behind them, so they read 0, and A6 and A7 belong to the radio module.

CircuitPython

Pick CircuitPython (code.py) in the board's Firmware panel and Run boots the official CircuitPython 10.3.1 firmware built for the Nano RP2040 Connect. board.LED is the LED on D13 (GPIO 6), and board.I2C() is on A4 and A5. Your code.py is saved onto the board's CIRCUITPY drive over USB and runs, and the Adafruit libraries it imports go into lib/ by themselves. The drive is 1 MB here, where a real Nano's 16 MB flash leaves 15 MB. See CircuitPython on the Pico, which covers both boards.

Common mistakes

digitalWrite(13, HIGH) to light the LED. Here 13 is GPIO 13, which is A5. Write digitalWrite(LED_BUILTIN, HIGH) or digitalWrite(D13, HIGH).

Starter project

Nano RP2040 button is the board across a breadboard with a pushbutton on D2 lighting the LED on D13.