I'm working on a robot project for an event coming up. We are using power from 12V battery of a motor scooter to power everything. My part involves wirelessly switching on/off 3-4 different things requiring 12V of power such as clamp and actuator.
I'm planning to use  Arduino Duemilanove and  XBee series 1 and  shields by libelium.
I know how to program a button to turn an LED on/off. I'm not very skilled w/ electronics so I'm wondering what I need to do to basically switch things on/off wirelessly using power from the 12V battery. I'm thinking I'll need a relay.
Can anyone share some insight on this or point me to some links?