{"title":"Adafruit HalloWing M4 Express","handle":"adafruit-hallowing-m4-express","url":"/products/adafruit-hallowing-m4-express","description":"The Adafruit HalloWing M4 Express is a skull-shaped development board powered by the ATSAMD51G18 — a 120 MHz Cortex M4 processor with 512 KB Flash and 192 KB RAM. Featuring a 1.54\" IPS TFT display (240×240 pixels), a 3-axis accelerometer, a light sensor, a speaker driver, four NeoPixel LEDs, and Feather-compatible headers, it's the ultimate board for wearables, badges, cosplay props, and spooky interactive projects.\n\nA significant upgrade over the HalloWing M0, the M4 version offers 4× the display pixels on a brighter IPS panel, a much faster processor, more RAM, and side-mounted NeoPixel LEDs for underlighting effects. It supports both Arduino and CircuitPython, with 8 MB SPI Flash for storing images, sounds, and animations.\n\nKey Features\n\n\nATSAMD51G18 at 120 MHz – 512 KB Flash, 192 KB RAM, 3.3V logic\n\n1.54\" IPS Colour TFT Display – 240×240 pixels with excellent colour and brightness, ships with customisable eye animation\n\n8 MB SPI Flash – Store images, sounds, and animations (up to ~3 minutes of WAV audio)\n\n3-Axis Accelerometer – Built-in motion sensing\n\nLight Sensor – Front-facing, reverse-mounted for ambient light detection\n\nMono Class-D Speaker Driver – Drives 4–8 ohm speakers up to 1W, connected to 12-bit DAC\n\n4 NeoPixel Side-Light LEDs – For cool underlighting effects\n\n4 Capacitive Touch Pads – Analog inputs with large alligator-clip holes\n\nFeather-Compatible Headers – Two female header strips accept FeatherWings\n\nJST Ports – 3-pin connectors for NeoPixels and sensors, 4-pin I²C connector (Grove-compatible)\n\nLiPo Battery Port – Built-in charging via USB\n\n3.3V Regulator – 500 mA peak output\nOn/Off Switch and Reset Button\n\nUF2 Bootloader – Drag-and-drop programming, easy CircuitPython conversion\n\n\nIdeal For\n\nHalloween props and spooky interactive displays\nWearable badges and cosplay electronics\nSound, animation, and display-driven projects\nFeatherWing-compatible development and prototyping\n\n\nPackage Contents\n\n1× Adafruit HalloWing M4 Express – Fully assembled with UF2 bootloader\n\n\n\nNote: LiPo battery not included. A 3.7V LiPo battery (350 mAh or 500 mAh recommended) is required for portable use. The board can also be powered via USB.\n\n\n\nTip: Looking for a more compact option? Check out the Adafruit HalloWing M0 Express with a smaller 1.44\" display and SAMD21 processor.\n\n\nResources\n\nAdafruit HalloWing M4 Learn Guide\nCustom Eye Graphics Guide\nCircuitPython\n","vendor":"Adafruit","product_type":"physical","in_stock":false,"options":[],"variants":[{"id":4943,"title":"Default Title","sku":"AF-4300","price":81.83,"compare_at_price":0.0,"on_sale":false,"in_stock":false,"available_quantity":0,"option1":"Default Title"}]}