The most powerful Metro at this time, the Adafruit Metro M4 featuring the Microchip ATSAMD51. This Metro is like a bullet train, with it’s 120MHz Cortex M4 with floating point support. Your code will zig and zag and zoom, and with a bunch of extra peripherals for support, this will for sure be your favorite new chipset.
To start off the ATSAMD51 journey it has a classic ‘Arduino compatible’ shape and pinout. This Metro is the same size as the others, and is compatible with many shields. It’s got analog pins where you expect, and SPI/UART/I2C hardware support in the same spot as the Metro 328 and M0. But! It’s powered with an ATSAMD51J19:
The primary target for this board is CircuitPython - with 120 MHz, and 192KB of RAM CircuitPython runs really well on this chip. At this time, the latest versions of CircuitPython working on this board, and more API parts are added every week.
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This is the latest stable release of CircuitPython that will work with the Metro M4 Express.
Start here if you are new to CircuitPython.
This is the latest unstable release of CircuitPython that will work with the Metro M4 Express.
Unstable builds have the latest features but are more likely to have critical bugs.
Every time we commit new code to CircuitPython we automatically build binaries for it. They are stored on Amazon S3 by language (some which may be unreleased.) Try them if you want the absolute latest and are feeling risky.
All previous releases are available on GitHub. They are handy for testing but we recommend the latest stable otherwise.