WBC Sample Demos

Location

$REVOLUTION_SDK_ROOT/build/demos/wbcdemo

Compilation

Change directories to $REVOLUTION_SDK_ROOT/build/demos/wbcdemo and enter make. An executable file (.elf) will be generated under the path $REVOLUTION_SDK_ROOT/RVL/bin/demos/wbcdemo/.

Running the Demos

Change to the $REVOLUTION_SDK_ROOT/RVL/bin/demos/wbcdemo/ directory and perform the following steps:

To simply execute a program, run the ndrun script using the ELF file as the argument:
To debug using CodeWarrior, do one of the following:

Run $CWFOLDER/bin/IDE.exe with the ELF file as an argument.
Launch $CWFOLDER/bin/IDE.exe, then drag and drop the ELF file.
If the ELF file is associated with $CWFOLDER/bin/IDE.exe, double-click the ELF file.

Description

handling_weight

Demo description:
Consists of handling.c from wpadHealthdemo, with weight conversion processing added.
It converts the values from the four balance sensors on the Wii Balance Board legs to weight (kg) and displays them.

The weight values shown on the right of the screen have the following meanings.

Wt	Average value over two seconds
Wt(TGC)	Average value over two seconds, corrected for temperature and gravitational acceleration

Operations Described:

START	Sets the zero point. Gets the raw WBC values over a duration of two seconds and sets the average value to the `WBCSetZEROPoint` function.
+Control Pad Left Button	Gets the average weight value. Takes the average value over two seconds.

Caution:

To take accurate weight measurements based on the characteristics of the balance sensors, you need to set the zero point every time you take a measurement (by pressing START with no weight placed on the WBC).

In the demo, temperature is updated immediately before the zero point is set. The temperature update command is executed inside the WBCSetZEROPoint function.

simple_wbc

Demo description:
This demo clearly shows how to control the Wii Balance Board. The code is a simplified version of the handling_weight demo.
Values for the four balance sensors are converted to weight (kg), and the total is displayed on the Wii console output. (Nothing appears on the TV screen.)

Operations Described:

A Button Sets the zero point. In this demo, the output values from the Wii Balance Board are sent to the WBCSetZEROPoint function without any modification.

balance

Demo description:
The simple_wbc demo with an added center of gravity display.
Values for the four balance sensors are converted to weight (kg), and the total is displayed on the Wii console. (Nothing appears on the TV screen.)

Operations Described:

A Button Sets the zero point. In this demo, the output values from the Wii Balance Board are sent to the WBCSetZEROPoint function without any modification.

Revision History

2008/08/28 Revised terminology.
2008/02/26 Added the simple_wbc and balance demos.
2007/11/15 Initial version.