Our friend Pete Mills has built an interesting visual project, it is a DIY Spinning Mirror Laser Light Show which was built into a cigar box. If you are wanting to make your own Pete has made the code available, this could be made without a controller but in this design a ATMega328 allows this project to be very powerful and flexible.
“When a mirror is mounted on a motor shaft so that the mirrors’ face is less than perpendicular and less than parallel to the motors axis of rotation and a laser is reflected off of this rotating mirror, the reflected laser light will trace a circle on a projection surface and dependent on the speed of the motor being high enough, the laser path traced will appear to be a solid circle on the projection surface (a wall in my case) due to the persistence of vision. “
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