“In this project we’ll show you how to build a POV LED wand. Adafruit DotStar’s deliver high speed PWM making them great for Persistence Of Vision. It’s powered by Adafruit’s Circuit Python, making it really easy to change and modify. The Adafruit Feather shows up as a USB drive so you can drag and drop the code. The handle and wand were designed to be 3D printed and houses all of the electronics.
As the LEDs move in space, they flash different parts of an image, building up an image in your brain. Using a long (several seconds) camera exposure, a single row of LEDs under computer control displays an image one line at a time while it’s carried or rolled across the frame. The combined result is a luminous picture floating in air.”