| This simple project uses the
hub's internal gyro sensor to imitate a handheld magnetic
compass. The gyro can't tell which direction is actually north,
but it starts by defining north to be the direction that the
model is pointed when you run the program. Then the red pointer
will always point north even when you rotate the model around.
You can press one of the hub arrow buttons to
reset the current direction to north at any time, and the
display also shows "N", "S", "E", or "W" if the model is within
10 degrees of pointing that direction relative to its idea of
north.
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