Phosphorescence chemical POV – Spray painting with UV LEDS, mtbf0 writes -

when i started building arduino brain machines i had a bunch of minipov boards left lying around, so i built one with uv leds. works pretty well. has it’s own font built in and room for about 950 characters of message. as presented here, there is an output bug at the end of the second line, but i reckon i’ll work on that in the morning. meanwhile, i can wave it around and wipe poetry onto a piece of butcher paper painted with fluorescent paint. here’s some not very good video of the chemical pov running the above code. the light does persist a little longer than it appears to in the video, but i think it will work better when i replace the current limiting resistors.