Propeller clock

Pierre Boucrault & Lilian Delaveau (14/15, 1st year)

The physical phenomenon used in this project is a bit different from the one used in movies where the beta effect is used: it happens when two images with a slight shift are displayed in a short time frame. Our brain automatically associates it to a movement ( In this project, we sent light signals with a quite high frequency (high enough to swindle eyes/brain). Our brain keeps a copy for a few milliseconds: this time is long enough to sent a shifted light signal. Therefore, a continuous image can be created. At this step, we could think that switching on/off LEDs without rotation should make the trick. However, this is not the case: rotation allows to “pixelate” the display. Here is the presentation we made (in French, sorry!):