When I first saw Crispin Jones Tengu, I was sure, I must have one. If you don’t know tengu and don’t want to follow the link, it’s a small face, made of LEDs, that reacts to music and sound. It did not take long until I decided to clone this funny little device. All it needs is a microcontroller, an LED matrix and a sound sensor.
DIY Tengu on a breadboard - [Link]