ELEC2807 Integrated Project (InfoE)
T1. Introduction of Wii remote
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Something you should know …
Nicknamed “Wiimote”
The controller of the
Wii video game
console
Powered by 2 AA batteries
Bluetooth communication
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Basic features of Wii remote
• Button
– 11 buttons
– Some buttons have special usage, like pressing 1 and 2 together to start Bluetooth
pairing
• Sensing
– Accelerometer
– Infrared Camera
• Feedback
– Rumble
– LED display
– Built-in speaker
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Sensing – Accelerometer (1)
• Use the ADXL330 accelerometer
• To sense acceleration along three axes of the Wii remote
• The accelerometer measures linear acceleration in a free fall frame of
reference
• Which means, if the Wii remote is in free fall, it will report zero
acceleration. At rest, it will report an upward acceleration (+Z, when
horizontal) equal to the acceleration due to gravity
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Sensing – Accelerometer (2)
• One typical usage is using accelerometer to capture and analysis user’s
motion
Motion Data Analysis Result
Golf
Baseball
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Sensing – Infrared Camera(1)
• Resolution of the infrared camera inside Wii remote can be up to 1024 x
768
• Capable of tracking up to 4 moving objects
• Field of view is about 33 degrees horizontally and 23 degrees vertically
• Infrared light sources with wavelength other than 940nm will be filtered
by the infrared filter
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Sensing – Infrared Camera(2)
• The infrared camera and infrared emitter (e.g. infrared LED) can act as a
pointing device
• The Wii Sensor bar, which is technically an array of infrared LED. The
relative movement of the infrared LED will be used for cursor position
update.
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Feedback - Rumble
• Wii remote will vibrate when the rumble function is activated
• Usually, game use the rumble function to indicate a crash or being hit.
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Feedback – LED Display
• 4 blue LEDs are on the front of the Wii remote
• During initialization state (Bluetooth pairing), these 4 LEDs will blink.
– The number of blinking LED indicate the battery power :
• 4 LEDs : ~ 100%
• 3 LEDs : ~ 75%
• 2 LEDs : ~ 50%
• 1 LED : ~ 25%
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Feedback - Built-in speaker
• Wii remote has a small low-quality 21mm speaker, used for short sound
effects during game play
• The sound is streamed directly from the host (e.g. The Wii console, PC etc)
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