Adafruit Metro RP2040

Overview

The Adafruit Metro RP2040 brings the powerful Raspberry Pi RP2040 microcontroller into an Arduino Uno-compatible form factor, enabling use with the vast ecosystem of Arduino shields. Unlike typical Metro boards, it provides 16 MB of QSPI flash, a microSD card slot (supporting both SPI and advanced SDIO modes), and a dedicated STEMMA QT connector for plug-and-play I2C sensor attachment.

The RP2040 features dual ARM Cortex-M0+ cores at 133 MHz, 264 KB SRAM, 8 programmable PIO state machines for custom hardware interfaces, and a built-in USB 1.1 controller with host and device support. The Metro RP2040 exposes 24 GPIO pins with 4 analog inputs and 16 PWM channels. A DPDT switch allows swapping the D0/D1 serial pins for greater wiring flexibility, and a 3-pin JST SH Pico Probe debug connector plus a standard 2×5 SWD header are included for debugging.

Power input options include USB Type-C (data and power) and a 5.5mm/2.1mm DC barrel jack (6–12V). An onboard NeoPixel, red LED on pin 13, reset and boot buttons, and an on/off power switch for the DC jack are included, along with four rubber bumper feet for desk use. Fully supported by CircuitPython, MicroPython (official port), and informal Arduino support.