Adafruit Grand Central M4 Express featuring SAMD51 - Without Headers
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 headerless version ships without through-hole components soldered, making it ideal for direct soldering into custom builds or fitting into tight spaces. 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
- Custom builds requiring a low-profile, headerless board
Package Contents
- 1× Adafruit Grand Central M4 Express (without headers) – Assembled and tested
- 1× 2.1 mm DC jack (loose, unsoldered)
- Bumper feet
Resources
Original: $61.92
-70%$61.92
$18.58Product Information
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Shipping & Returns
Shipping & Returns
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 headerless version ships without through-hole components soldered, making it ideal for direct soldering into custom builds or fitting into tight spaces. 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
- Custom builds requiring a low-profile, headerless board
Package Contents
- 1× Adafruit Grand Central M4 Express (without headers) – Assembled and tested
- 1× 2.1 mm DC jack (loose, unsoldered)
- Bumper feet
