A Sound-Reactive LED Bracelet

Sound-reactive LED bracelet powered by ATtiny85. 15x WS2812 LEDs, USB charging, and wearable design—perfect for festivals and makers

Markus Loeffler

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Description

The bracelet features 15x WS2812 addressable LEDs embedded in a soft TPU band. At its heart is an ATtiny85 microcontroller running custom firmware that processes incoming audio and drives dynamic LED animations. Power is supplied by a slim 180mAh LiPo battery, making the bracelet lightweight, compact, and fully portable.

Features:
-Sound-reactive animations
-ATtiny85-powered (compatible with my TinyBlinky prototyping board)
-Compact, wearable form factor
-USB charging
-Festival-ready design

This project combines my experience in DIY electronics, coding, 3D printing, and wearable design. I am very happy of how small embedded systems can bring light, motion, and rhythm together in a fun and fashionable way.

✨ Special thanks to PCBWay for sponsoring the PCB manufacturing!

Details

Huge thanks to PCBWay for their excellent service and high-quality PCB manufacturing! The boards arrived quickly, perfectly fabricated, and ready to go. Their support throughout the process was top-notch—highly recommended for makers and pros alike!