Typing the simple ascii characters will move your robot around, but what you might want is a more intuitive and responsive control interface. The most practical way of doing this is a game controller that has joysticks and several additional buttons. This will make controlling your wheeled robot from the remote computer much easier.
To add the game controller, you'll need to first find a game controller that can be connected to your computer. If you are using Microsoft Windows as the OS on the host computer, then pretty much any USB controller that can be connected to a PC, will work. The same type of controller also works if you are using Linux for the remote computer. In fact, in this example, you'll use another Raspberry Pi as the remote computer.
Since the joystick will be connected to the remote computer, you'll need to run two programs, one on Raspberry Pi remote computer and other on Raspberry Pi on the wheeled robot. You'll use the wireless...