How to make a robot with home materials?

Ah, a classic challenge. The heart of your robot will be a small motor. You can salvage one from an old electronic toy. For the body, a simple cardboard box or plastic bottle works well. Bottle caps make for excellent wheels. The real magic is the circuit. You need only a battery and some wire to connect to your motor. This creates simple, direct movement. It is a humble machine, of course, but it is the true beginning of robotics.