Adafruit METRO M0 Express

Dev Board
Adafruit METRO M0 Express

Arduino Uno-compatible development board powered by ATSAMD21G18 Cortex M0+ at 48MHz with 256KB flash, 32KB SRAM, 2MB SPI flash, and CircuitPython pre-loaded. Features Arduino shield compatibility and

ATSAMD21G18 ARM Cortex M0+32 KB256 KB25 GPIO
~$25View

Adafruit Grand Central M4 Express

Dev Board
Adafruit Grand Central M4 Express

Arduino Mega-form-factor board with ATSAMD51P20 Cortex M4F at 120MHz, 1MB flash, 256KB RAM, 8MB QSPI flash, 70 GPIO pins, SD card slot, 8 SERCOM, 22 PWM outputs, dual DAC/ADC, AES-256, and native USB.

Microchip ATSAMD51P20 ARM Cortex M4F256 KB1 MB70 GPIO
~$40View

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