The DC4 SportBot was a multi-team Rube Goldberg machine with a movie theme. Our 12-person group assigned subteams; I was responsible for the Legally Blonde component. The Legally Blonde module was designed to receive a ball, route it via wire rails, trigger a gavel rotation 90 degrees via a 555-timer-driven motor, then pass the ball to the next track. (Design and circuit details are in the SportBot documentation.)
How it worked (summary):
- Frame & routing: I laser-cut a Harvard Law-style frame to act as the physical structure; the ball enters at the back and follows wire rails that wrap it toward the gavel entrance.
- Gavel mechanism: The gavel was constructed from a modified toilet-paper roll reinforced with papier-mâché and a small PVC shaft; a 3D-printed collar fit the motor's rotating pin to the gavel securely.
- Switch & timing: The ball depresses a switch in the gavel entrance that triggers a 555-timer circuit, commanding the motor to rotate the gavel for ~2 seconds (deliver ball to exit rail) — wiring and switch are embedded inside the gavel housing for neatness and reliability.
- Wiring & packaging: All wiring routed through the gavel body and frame so motion did not tangle or pull on wires; 3D-printed motor mounts were iterated for wear resistance and fit.
- Integration: The output exit aligns to the next module's entry. The SportBot documentation includes the Legally Blonde circuit schematic and action summary (see memo).
Below are video(s) and photos: one full-team run video, one video of my component, and three photos (gavel close-up, frame routing, integrated view). Click the memo button for full documentation including schematics and team reflections.