Bluetooth: Ye olde King BluetoothBluetooth is a wireless protocol for sending serial data over the air. It was named after Harald I of Denmark. In fact, the symbol for Bluetooth consists of the runes for that king's name.

In order to put a project together, you'll need the following resources:

• A Bluetooth modem board, such as the BlueSMiRF
• An Arduino board or stamp
• Outputs from the Arduino (vibration "rumble" motors in our case)
• Input to the Arduino board (like our accelerometers)
• A computer or other device that can communicate via Bluetooth (most recent Macs and laptops, as well as certain Nokia phones, etc.)