Build a truck that "talks" to alert when there is a problem.
Engineer a robot that turns itself off when it leaves a safe area.
Create a circuit that has no metal wires and uses at least three different conductors.
Build an open circuit that completes when the water level drops below a certain level and/or goes above a certain level.
Engineer a sensor that can detect how much fuel is in your tank
Build a wearable device that will detect when your body moves.
Build a box that only you know how to open and is safe from hackers.
Build a joystick that can turn on and turn off multiple things
Make a bubble maze that allows bubbles to move through a series of “on” and “off” switches.