Here’s a DIY laser show project entirely from spare parts. The laser and motors are from an old DVD player, the collimator is from an old laser printer, and it’s all controlled by a Basic Stamp 2. DIY Engineering says:
I’ve designed the circuitry myself (not the LD driver), I studied the motor and mirror setup in a cheap laser crab I had. It’s quite simple: the motors are aligned 45 degrees in accordance to the beam, and the first motors mirror is angled 4 degrees and second motors’ about 6 degrees. This is tuned depending on how big a flower you want, mine is about 2 m in diameter from a distance of 4 m.
The BS2 simply runs the motors at random speeds (through an LM358 and small signal PNP), for random seconds. I probably will burn a PIC and put in there later since I need the BS2 for other projects.
For the schematic, source code and more visit DIY Engineering.