[Rickertsen2]

Unless you either want to rotate the robot and or have lots of sensors and be slow, there is no way to do this without motors. My point was to only use one motor and do things really fast. Or if you wnat to be really elaborate, you could use the above setup combined with a giant spring pretensioned before the match, that unwinds through a greartrain and roatates the mirror or sensor during the 15 secs.

Btw, the reason i mentioned using a mirror is bc its hard to spin a sensor really fast with wires atached, without using slip rings(rotating electrical connectors) or other weird hard to find expensive parts.