Built in a single day, Lo-Blow is a playful mechanical duel powered entirely by breath and motion. Two windmill-like fans are connected to DC motors, which generate current as players blow on them. The stronger the airflow, the more current is produced—visualized through LED feedback on an Arduino. When a player’s generated current crosses a threshold, it triggers a mechanism that launches a rubber band at their opponent, declaring victory in a humorous, kinetic way.