Adafruit Metro M4 Express | DigiKey Daily

The Adafruit Metro M4 Express, featuring Microchip's ATSAMD51, is said to be the fastest, most powerful Metro ever. This development board uses the classic Arduino-compatible shape and pinout that you know and love, and is compatible with all the Adafruit shields. It uses a Cortex M4, which runs at 120 megahertz, and supports floating point. Other features of the high performance ATSAMD51 microcontroller include 512 kilobytes of Flash, 192 kilobytes of RAM, a dual digital-to-analog converter, a dual analog-to-digital converter, sixteen PWM outputs, a 10-bit parallel capture controller, and more. Some nice PCB extras include 7 to 9 volts DC input polarity protection, and four indicator LEDs and one NeoPixel, on the front edge of the PCB, for easy debugging.