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SetTitle("Stop") recording = 1 OPEN fileName$ FOR OUTPUT AS #1 END SUB ! ! ! ! Called to stop recording data, this subroutine changes the name of the recording button to Recording, clears the recording flag and closes the output file. It is safe to call this subroutine even if nothing is being recorded. setEnabled(1) END IF END SUB ! Handle a tap on one of the buttons. ! Parameters: ! ctrl - The button that was tapped. time - The time when the event occurred. SUB touchUpInside (ctrl AS Button, time AS DOUBLE) IF ctrl = quit THEN stopRecording STOP ELSE IF ctrl = record THEN IF recording THEN stopRecording The Magnetometer | 37 ELSE startRecording END IF ELSE IF ctrl = send THEN stopRecording sendData END IF END SUB Faster Sensor Response The three programs presented so far are fun, useful ways to see the raw sensor values for the accelerometer, gyroscope, and magnetometer, but they do have a drawback.

Mag ! If needed, write the value to the output file. IF recording AND (t0 <> m(4)) THEN PRINT #1, m(1); ","; m(2); ","; m(3); ","; m(4) END IF ! Update the plot. 1 THEN ! Update the arrays holding the points to plot. 1 FOR i = 1 TO 99 mx(i, 2) = mx(i + 1, 2) my(i, 2) = my(i + 1, 2) mz(i, 2) = mz(i + 1, 2) NEXT mx(100, 2) = m(1) my(100, 2) = m(2) mz(100, 2) = m(3) WEND 34 | Chapter 2: Accessing the Other Built-in Sensors ! Adjust the function range based on the maximum observed value. setView(-10, -range, 0, range, 0) !

Create the plots and arrays to hold the plot points. DIM p as Plot, px as PlotPoint, py as PlotPoint, pz as PlotPoint DIM rx(100, 2), ry(100, 2), rz(100, 2) ! Create the controls. DIM quit AS Button, record AS Button, send AS Button ! Create and initialize the global tracking variables. txt" The Gyroscope | 25 recording = 0 ! Get and set an initial time for the gyroscope. gyro t0 = r(4) WEND END IF ! Create the user interface. setUpGUI ! Creates a new button with a gradient fill. ! Parameters: !

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