MEMS Sensor 2 (Nunchuk)
Many games on the Wii take advantage of a second controller, called the Nunchuk, which plugs into the Wii Remote. It features an analog joystick and two buttons, but it also has its own MEMS accelerometer, this one provided by STMicroelectronics. Benedetto Vigna, an STMicroelectronics physicist, says that the company’s three-dimensional accelerometer had a “really quick” development time; the company first met with Nintendo about the Wii in March 2005, only nine months before the product shipped. Vigna notes that there are two chips inside the 5-millimeter-by-5-millimeter-by-1.5-millimeter plastic package–the accelerometer and another chip that translates the tiny wiggles of the sensor into voltage. As in the Wii Remote, the voltage readings are then translated into motion data by a microprocessor, and the data are transmitted wirelessly from the Wii Remote via Bluetooth to the Wii console.
Infrared Sensor Bar
The accelerometers in the controls gauge movement but not position relative to the TV screen. So the Wii comes with a “sensor bar,” to be placed at the top or bottom of the screen. The bar sends out an infrared signal, which is picked up by detectors at the front of the Wii Remote. The Remote uses distance and angle information to triangulate its location, which it sends, along with acceleration data, to the console.
Nintendo saw the value of adding Wi-Fi wireless connectivity to its popular DS handheld gaming device, which allowed users to play against others wirelessly, so it did the same with the Wii. If you have an Internet connection, you can use the Wii to surf the Web or access information hosted on Nintendo’s servers, such as weather and news. Developers have said there will be Wii games that offer online play, though as of this writing only one–a Pokémon title–has been released.