This kit from natrium42 lets you build a custom robotic device that’s controlled by the Nintendo DS portable gaming system.
The $119 RoboDS is an open robotics platform for the Nintendo DS, designed to let you remotely control your robot through the DS’ brains and on-board Wi-Fi connection.
The system includes a wheeled base that can be driven via remote control, and can be extended through the connection of additional serial devices. The platform lets you securely mount your DS, provides rechargeable power for the robotics, and connects to a special card called the DSerial2 which lets you control devices with your DS.
In order to use the RoboDS, you’ll need the DSerial2 card ($45,) as well as the hardware to run homebrew code on your DS, all of which is available from natrium42’s online shop. If you want to check out the RoboDS in action, you can actually remotely control the original prototype here.