Hi Trawen,
Which pcb did you make?
The one from post #136?
If only one galvo moves, change the TL082. These things sometimes brake down for no appearant reason.
Is the power supply section correct?
Did you fit the shield correctly to Arduino DUE?
If the pin is one off, then only 1 DAC is...
Beside the projector, you also need a DAC, a device which controls the projector.
Further you have to think about the wavelengths to use and their power ratio.
Othewise you cannot get a nice white color.
Thanks Maciejas!
I could not agree more with Things.
The distance from the photo sensor depends also on the amount of ambient light.
But as Things said, with good shielding, you can improve the harp's sensitivity a lot.