Adafruit Metro RP2350 with PSRAM

Overview

The Adafruit Metro RP2350 with PSRAM brings the RP2350 microcontroller into the familiar Arduino Uno form factor, making it a natural drop-in for projects that rely on Uno-compatible shields. Built around Raspberry Pi's RP2350 chip, it offers dual ARM Cortex-M33 or RISC-V Hazard3 cores at 150MHz, significantly more processing power than the RP2040 it succeeds. The Metro form factor exposes 37 GPIO pins, including 6 analog inputs, spread across socket headers and an HSTX high-speed serial port.

The defining feature of this variant is 8MB of QSPI PSRAM added alongside the 16MB of QSPI flash and 520KB of on-chip SRAM. This extra dynamic memory is particularly valuable for CircuitPython users, who get dramatically more working space for code, data structures, and libraries. For C/C++ developers, it unlocks use cases such as frame buffering, audio streaming, and large lookup tables that would overflow on-chip SRAM alone.

Adafruit includes a NeoPixel RGB LED, a reset button, and a STEMMA QT / Qwiic I2C connector for quick integration with sensor and display breakout boards. The USB-C connector supports native USB for programming and serial communication without a separate UART chip. A standard DC barrel jack (5.5mm/2.1mm, 6–12V input) allows powering from a wall adapter alongside the USB-C option.

The board ships with CircuitPython pre-installed and is fully compatible with the Arduino IDE and the Raspberry Pi Pico SDK. Adafruit's extensive open-source documentation, learning guides, and CircuitPython libraries make it a well-supported platform for makers moving from classic Arduino boards to the modern RP2350 ecosystem.