The Grand Central M4 Express is Adafruit’s most powerful and feature-rich development board yet—built for makers, engineers, artists, and innovators who need serious horsepower and maximum I/O. At its core is the ATSAMD51P20, a blazing-fast 120MHz ARM Cortex-M4F processor with floating-point support, perfect for real-time data processing, robotics, and advanced control systems.With 70 total GPIO pins, including 15 analog inputs, 22 PWM outputs, and dual 1 MSPS DACs, the Grand Central offers unmatched flexibility for complex projects. It’s loaded with 1MB of flash and 256KB of RAM, plus QSPI flash, SD card support, NeoPixel control, and built-in crypto engines for secure applications.