- Combination Lock Box
- Money Bank Robot
Project Line: Engineering
Combination Lock Box - The combination lock is one opened not by a key but by the alignment of its interior parts in a definite position. The most common types have an internal mechanism consisting of a series of three or four interconnected rings or discs that are attached to and turned by a central shaft. Manually rotating the outside knob or dial turns the discs, each of which is "programmed" to stop at a notched opening or gate.
Money Bank Robot - The Money Bank Robot is hungry for money! Just place a coin on the coin tray and - Gulp! - The robot swallows the coin into its mouth! The Money Bank Robot is composed of two series of circuits controlled by a knife switch. The reason why the robot can open and close its mouth is the conductivity property of conductors. Conductivity is a property that allows electricity to flow through a material. Coins are conductive materials. When the coin touches the two metal pieces on coin tray, the circuits are connected, driving the motor to rotate.