Building Robots With Lego Mindstorms

416 Chapter 21 • Playing Musical Instruments

Programming the Drummer

This is one of those cases where the simplicity of the structure corresponds to the

simplicity of the software.As we explained earlier, all you have to do to use the

sticks is to run the motor for a very short time before switching it into float mode.

In our test version, we kept the motor on for just two hundredths of a second.

Create three routines (or macros) that correspond to the left and right sticks

as well as the pedal. Each one will have a structure similar to the following NQC

example:

void right_stick()

{

On(OUT_C);

Wait(2);

Float(OUT_C);

}

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Figure 21.5 Drummer Rear ...