The Adafruit HalloWing M0 Express is a skull-shaped development board built around the ATSAMD21G18 processor. Featuring a 1.44" full-colour TFT display, a 3-axis accelerometer, a light sensor, a speaker driver, and Feather-compatible headers, it's designed for wearables, badges, cosplay props, and spooky interactive projects.

The board ships with the UF2 bootloader pre-installed and supports both Arduino and CircuitPython. The 8 MB SPI Flash provides ample storage for images, sounds, and animations — enough for up to 3 minutes of WAV audio. Four capacitive touch pads with alligator-clip holes offer easy interactive input.

Key Features

• ATSAMD21G18 at 48 MHz – 256 KB Flash, 32 KB RAM, 3.3V logic
• 1.44" Colour TFT Display – 128×128 pixels, ships with animated eye demo
• 8 MB SPI Flash – Store images, sounds, and animations
• 3-Axis Accelerometer – Built-in motion sensing
• Light Sensor – Front-facing, reverse-mounted for ambient light detection
• Mono Class-D Speaker Driver – Drives 4–8 ohm speakers up to 2W, with mini volume pot
• 4 Capacitive Touch Pads – Analog inputs with large alligator-clip holes
• Feather-Compatible Headers – Two female header strips accept FeatherWings
• JST Ports – 3-pin connectors for NeoPixels and sensors, 4-pin I²C connector (Grove-compatible)
• LiPo Battery Port – Built-in charging via USB
• 3.3V Regulator – 500 mA peak output
• On/Off Switch and Reset Button
• UF2 Bootloader – Drag-and-drop programming, easy CircuitPython conversion

Ideal For

• Halloween props and spooky interactive displays
• Wearable badges and cosplay electronics
• Sound and animation-driven projects
• FeatherWing-compatible development and prototyping

Package Contents

• 1× Adafruit HalloWing M0 Express – Fully assembled with UF2 bootloader

Resources

• Adafruit HalloWing Learn Guide
• CircuitPython