Check out the latest learn guide from Erin St Blaine: Make a necklace pendant or amulet with a Feather ESP32 and a 64-pixel matrix inside. Use WLED’s 2-d mapping features to run two dimensional animations on the matrix, jazzing up your outfit with flames, clouds, and psychedelic patterns that you can control via your smart phone or web browser over WiFi — with no coding required.
From the guide:
Make your outfit shine with this customizable LED amulet. It packs a whopping 64 LEDs into a tiny space so you can go crazy with animations and effects, match any outfit, and twinkle like the star you are.
This is a fairly easy project that requires a little tight soldering, but no coding. The free, open-source WLED software does all the heavy lifting for you, and offers dozens of animations and color palettes to choose from, using a smart phone interface over your local WiFi network.
My enclosure is sculpted from low-temperature thermoplastic, giving a fun organic look to the necklace. The electronics could also easily be made into a hat topper or brooch. This little piece of sparkle is versatile and small enough to use just about anywhere you need some light and color.
— Adafruit Feather HUZZAH (ESP32) — provides WiFi, LiPo charging, JST battery port and GPIO pins
– Adafruit DotStar 8×8 LED Matrix — 64 RGB LEDs that form the pendant display wired to the Feather
Full tutorial: LED Matrix Necklace Pendant