This project stands on tall shoulders of Nothing Labs
instructable X-Y control
... Speakers are used as Galvos.. first speaker controls the x-axis and the second speaker the y-axis
I wanted to make a Guerilla Propaganda machine.... and I got pretty close to where I wanted it to be...
Going forward I would recommend using a stronger laser... This would allow you to hit a building or billboard at a mysterious distance... I tried to buy a stronger, $14 green laser from China
but the china laser circuit did not allow cycling ON/OFF at quick rate like this $5 laser from harbor freight seen below...(this is called blanking in the laser industry) You could rewrite the code to be more cursive in nature and less ON/OFF dependent... It would be fun to play with the programming in such a way and easy for a beginner... its all cartesian coordinates... that means easy!
HAVE FUN and please broadcast your good ideas in public spaces to better compete against those leveraged ideas....
other ideas... attach it to a telephone pole or climb a tree and hit a local billboard with a function to turn on during rush hour for 5 minutes every night..
"Book night"...Have it randomly project 1984
onto the side of a building for a few minutes every night...