Stroboscope
This is a simple stroboscope using a speed-controlled DC motor and a LED which blinks with a relatively high and adjustable frequency. The basic idea is to adjust the blinking frequency and/or the speed of the disk in order to obtain interesting patterns. For example, one can make the rotating disk look still, or slowly turn backwards/forwards. Technically, one potentiometer adjusts the motor speed and the other potentiometer adjusts the blinking frequency.
The initial idea was to have a simple story of 8 little sketches on the disk and to adjust everything so that an observer would see a basic "movie" made of the successive pictures. In practice, adjusting the blinking frequency and the speed proved harder than expected.
