[J]oby came up with an innovative way to emulate capacitive sensing using a tinfoil, a capacitor and a resistor using the Launchpad. The theory behind it is simple – charge the capacitor, then wait for it to discharge it through the resistor when you touch it. This will register as a voltage to drop to a port pin. The circuit seems to work pretty well and registers a touch every time, as he demonstrates in the video.
Download the code when you visit his post.