Instructions

Game and Knowledge in Electronics-Lab
40
The micro-controller contains a secret
message. To retrieve it, you only need to
connect the LED strip. The programme is
started with the connection C-H.
39
Secret message
First, you only see random flashes of the
LEDs. But if you move the entire mounting
plate back and forth quickly, you can paint a
picture in the air. Move the game faster and
faster over a distance of about 25 cm, until
you can see the secret message. (Tip: It is
not a question mark.)
The light of the fast-moving LEDs reaches
different areas on the retina of your eye. But
because each photoreceptor maintains the
light stimulus for a short moment, you still
see the light when the LED is already in a
different place. This creates a seemingly
stationary picture in your head.