Glowboard now plots grayscale images.

A project log for Glowboard Plotter

The Glowboard Plotter plots images using 64 UV LEDs attached in a line moved over a 120cmx60cm glow-in-the-dark sheet by a stepper.

nilonilo 05/25/2016 at 22:100 Comments

By applying multiple passes, every pass containing fewer LEDs (lightest pixels are contained in all passes, darkest pixels only in the first, and so on) the glowboard can now plot grayscale images. We limited the number of passes to 10, which gives very nice results. After a while, the contrast decreases (because brightness of the glow-in-the-dark material decreases exponentially), and the image looks smooth for a few minutes.