Adafruit Grand Central M4 Express featuring the SAMD51

The Adafruit Grand Central M4 Express is a feature-rich development board powered by the ATSAMD51 Cortex M4 processor running at 120MHz. Designed in the Arduino Mega form factor, it offers extensive GPIO pins, multiple communication interfaces, and advanced analog capabilities including dual ADC and DAC. With 8MB QSPI flash and a microSD card slot, it supports data logging and storage applications efficiently. Native USB support allows easy programming without additional hardware. Compatible with Arduino IDE and CircuitPython, it simplifies development for beginners and professionals alike. Built-in NeoPixel and status LEDs improve debugging and visual feedback. Ideal for robotics, IoT, and embedded projects, this board delivers high-speed processing and flexibility for demanding applications. Features: 120MHz Cortex M4 with floating-point support Arduino Mega-compatible form factor 62 GPIO pins with 16 analog inputs Dual DAC and high-speed ADC support 8MB onboard QSPI flash storage Native USB with UF2 bootloader MicroSD card slot for external storage Built-in NeoPixel and status LEDs Specifications: Microcontroller : ATSAMD51P20 Core : Cortex M4 CPU Speed : 120 MHz Floating Point Support : Yes (DSP instructions) Flash Memory : 1 MB RAM : 256 KB Logic Level : 3.3 V Total GPIO Pins : 70 Usable GPIO Pins : 62 Analog Inputs : 16 ADC : Dual 1 MSPS Analog Outputs : 2 (DAC) DAC : Dual 1 MSPS SERCOM Interfaces : 8 (I2C/SPI/UART configurable) PWM Outputs : 22 Communication Interfaces : SPI, I2C, UART USB Support : Native USB Storage : 8 MB QSPI Flash External Storage : MicroSD Card Slot (SPI) I2S Support : Stereo I2S with MCK Parallel Capture : 12-bit (camera/video input) Crypto Engine : AES-256, True RNG, Public Key Power Input (DC Jack) : 6V–12V (polarity protected) Power Input (USB) : 5V via Micro USB Bootloader : UF2 (drag-and-drop programming) Indicators : Power LED, RX/TX LEDs, user LED RGB LED : 1 x NeoPixel Form Factor : Arduino Mega compatible Dimentions: 104 x 54 x 10 mm Weight: 34 g Package Includes: 1 x Adafruit Grand Central M4 Express featuring the SAMD51 4 x Rubber Bumper

Specifications

Microcontroller	ATSAMD51P20
CPU Speed	120 MHz
Flash Memory	1 MB
RAM	256 KB
Operating Voltage	3.3 V
Shipping Weight	0.04 kg
Shipping Dimensions	12 × 10 × 2 cm