We are the champions

An "tiny" air writer based on persistance of vision (POV).
It easily fits in any pocket. By pushing the button and waving the unit, text will appear mid air. Easy to input your own text by adapting the attached Arduino file and upload it to the ATtiny.
Put your text in Excell or on a piece of paper and fill in the individual leds.
If you can't make a PCB, just use a piece of perfboard.
Bend the battery pins slightly inwards befor pushing them into the openings to make a relyable contact.