Adafruit Grand Central M4 Express featuring the SAMD51
The Adafruit Grand Central M4 Express is a powerful development board built around the Microchip ATSAMD51P20 — a 120 MHz Cortex M4 processor with hardware floating point, 1 MB Flash, and 256 KB RAM. In the familiar Arduino Mega form factor, it brings 70 GPIO pins, dual DACs, 15 analog inputs, 8 MB QSPI Flash, an SD card slot, and a NeoPixel to your projects.
This version comes with headers pre-soldered, ready to plug into breadboards and accept shield connections. The front half shares the same pinout as Adafruit Metro boards, making it compatible with Arduino shields. It supports both CircuitPython and Arduino IDE, with a UF2 bootloader for drag-and-drop firmware loading over USB.
Key Features
- ATSAMD51P20 Cortex M4 at 120 MHz – Hardware DSP and floating point support
- 1 MB Flash, 256 KB RAM – 32-bit, 3.3V logic and power
- 70 GPIO Pins Total – 62 accessible GPIO, 16 analog inputs, 2 true analog outputs (DAC)
- 8 Hardware SERCOM – Configurable as I²C, SPI, or UART
- 22 PWM Outputs – For servos, LEDs, and motor control
- Stereo I²S Input/Output – With MCK pin for audio projects
- 12-bit Parallel Capture Controller – For camera and video input
- Built-in Crypto Engines – AES-256, true RNG, and public key controller
- 8 MB QSPI Flash – Acts as storage for CircuitPython scripts and files, or as a datalogger in Arduino
- Micro SD Card Slot – Removable storage via SPI
- Native USB – Serial, HID keyboard/mouse, and UF2 bootloader for drag-and-drop programming
- Flexible Power – 7–9V DC via 2.1 mm jack (with on/off switch) or 5V via Micro-USB, with automatic switching
- Status LEDs and NeoPixel – Green power LED, RX/TX LEDs, red indicator LED, and one RGB NeoPixel
Ideal For
- Complex projects needing many I/O pins (Arduino Mega replacement)
- CircuitPython development with high performance and large storage
- Audio, sensor logging, and data-heavy applications
- Prototyping with breadboards and Arduino shields
Package Contents
- 1× Adafruit Grand Central M4 Express (with headers) – Assembled, tested, and ready to use
Resources
Original: $77.94
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Description
The Adafruit Grand Central M4 Express is a powerful development board built around the Microchip ATSAMD51P20 — a 120 MHz Cortex M4 processor with hardware floating point, 1 MB Flash, and 256 KB RAM. In the familiar Arduino Mega form factor, it brings 70 GPIO pins, dual DACs, 15 analog inputs, 8 MB QSPI Flash, an SD card slot, and a NeoPixel to your projects.
This version comes with headers pre-soldered, ready to plug into breadboards and accept shield connections. The front half shares the same pinout as Adafruit Metro boards, making it compatible with Arduino shields. It supports both CircuitPython and Arduino IDE, with a UF2 bootloader for drag-and-drop firmware loading over USB.
Key Features
- ATSAMD51P20 Cortex M4 at 120 MHz – Hardware DSP and floating point support
- 1 MB Flash, 256 KB RAM – 32-bit, 3.3V logic and power
- 70 GPIO Pins Total – 62 accessible GPIO, 16 analog inputs, 2 true analog outputs (DAC)
- 8 Hardware SERCOM – Configurable as I²C, SPI, or UART
- 22 PWM Outputs – For servos, LEDs, and motor control
- Stereo I²S Input/Output – With MCK pin for audio projects
- 12-bit Parallel Capture Controller – For camera and video input
- Built-in Crypto Engines – AES-256, true RNG, and public key controller
- 8 MB QSPI Flash – Acts as storage for CircuitPython scripts and files, or as a datalogger in Arduino
- Micro SD Card Slot – Removable storage via SPI
- Native USB – Serial, HID keyboard/mouse, and UF2 bootloader for drag-and-drop programming
- Flexible Power – 7–9V DC via 2.1 mm jack (with on/off switch) or 5V via Micro-USB, with automatic switching
- Status LEDs and NeoPixel – Green power LED, RX/TX LEDs, red indicator LED, and one RGB NeoPixel
Ideal For
- Complex projects needing many I/O pins (Arduino Mega replacement)
- CircuitPython development with high performance and large storage
- Audio, sensor logging, and data-heavy applications
- Prototyping with breadboards and Arduino shields
Package Contents
- 1× Adafruit Grand Central M4 Express (with headers) – Assembled, tested, and ready to use
