Are you the kind of person who doesn’t like taking down the skeletons and spiders until after January? Well, we’ve got the development board for you. This is electronics at its most spooky! The Adafruit HalloWing M4 is a skull-shaped ATSAM521 board with a ton of extras built in to make for an adorable wearable, badge, development kit, or the engine for your next cosplay or prop.
There’s also 4 fang-teeth below the display, these are analog/capacitive touch inputs with big alligator-clip holes.
On the reverse is a smorgasbord of electronic goodies:
ATSAMD51G18 @ 120MHz with 3.3V logic/power – 512KB of FLASH + 192KB of RAM, can run Arduino or CircuitPython super fast
8 MB of SPI Flash for storing images, sounds, animations, whatever!
3-axis accelerometer (motion sensor)
Light sensor, reverse-mount so that it points out the front
Mono Class-D speaker driver for 4-8 ohm speakers, up to 1 Watt, connected to a 12-bit DAC on the SAMD51
Four side-light NeoPixel LEDs for cool underlighting effects
LiPoly battery port with built in recharging capability
USB port for battery charging, programming and debugging
Two female header strips with Feather-compatible pinout so you can plug any FeatherWings in
JST ports for Neopixels, sensor input, and I2C (you can fit I2C Grove connectors in here)
3.3V regulator with 500mA peak current output
OK so technically it’s more like a really tricked-out Feather M4 Express than a Wing but we simply could not resist the HalloWing pun.
You can use the Hallowing similarly Feather M4 Express, it’s got the same chip although the pins have been rearranged. We’ve got both Arduino and CircuitPython build support for it so you can pick your favorite development language! The extra 8 MB of SPI Flash is great for sound effects projects where you want to play up to 3 minutes of WAV files.
On each side of the Hallowing are JST-PH plugs for connecting external devices. The 3-pin JSTs connect to analog pins on the SAMD21, so you can use them for analog inputs. We label one for NeoPixel and one for Sensors since we think most people will have one of each. The 4-pin JST connector connects to the I2C port and you can fit Grove connectors in it for additional hardware support.
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.