The Adafruit ItsyBitsy M4 Express is a high-performance microcontroller board powered by the ATSAMD51 Cortex M4 running at 120 MHz with hardware floating point and DSP support. Packed into a tiny 1.4" × 0.7" form factor, it delivers 512 KB Flash, 192 KB RAM, and 2 MB of SPI Flash for CircuitPython code and file storage.

Ships with CircuitPython pre-loaded — plug it in, edit the Python code on the drive that appears, and your project runs immediately. Also fully compatible with the Arduino IDE. The UF2 bootloader makes flashing as simple as dragging a file to a USB drive.

Key Features

• ATSAMD51 Cortex M4 – 120 MHz, 32-bit with hardware floating point and DSP
• 512 KB Flash, 192 KB RAM – Plenty of room for complex projects
• 2 MB SPI Flash – Onboard storage for CircuitPython code, data logging, and files
• CircuitPython & Arduino – Ships with CircuitPython; also programmable via Arduino IDE
• Native USB – Serial console, HID keyboard/mouse, MIDI, or disk drive
• 23 GPIO Pins – 7× analogue inputs (12-bit), 2× 12-bit DAC outputs (1 MSPS), 18× PWM
• Dual 12-bit DAC – Play 12-bit stereo audio clips from A0 and A1
• VHigh Output & Level-Shifted Pin 5 – 5V logic output for NeoPixels, servos, and LEDs
• DMA NeoPixel Support – Drive 60,000+ pixels without processor overhead
• Built-in Crypto – AES-256, true RNG, and public key controller
• UF2 Bootloader – Drag-and-drop firmware flashing via USB
• Built-in RGB DotStar LED – Plus red Pin 13 LED

Ideal For

• High-performance CircuitPython and Arduino projects in a compact form
• Audio projects with dual 12-bit DAC outputs
• Large NeoPixel/DotStar LED installations with DMA support
• Shrinking Metro M4 or Feather M4 prototypes into final builds

Package Contents

• 1× Adafruit ItsyBitsy M4 Express (with CircuitPython pre-loaded)
• 1× Header Strip (unsoldered)

Resources

• Adafruit ItsyBitsy M4 Express Guide
• CircuitPython.org