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First, you set up two variables: float sinVal; int toneVal; The sinVal float variable holds the sin value that causes the tone to rise and fall in the same way that the lamp in Project 7 pulsated. The toneVal variable takes the value in sinVal and converts it to the frequency you require. In the setup function, you set Digital Pin 8 to an output: void setup() { pinMode(8, OUTPUT); } In the main loop, you set a for loop to run from 0 to 179 to ensure that the sin value does not go into the negative (as you did in Project 7): for (int x=0; x<180; x++) { You convert the value of x into radians (again, as in Project 7): sinVal = (sin(x*(3.1412/180))); Then that value is converted into a frequency suitable for the alarm sound: toneVal = 2000+(int(sinVal*1000)); You take 2000 and add the sinVal multiplied by 1000. This supplies a good range of frequencies for the rising and falling tone of the sine wave. Next, you use the tone() command to generate the frequency at the piezo sounder: tone(8, toneVal); The tone() command requires either two or three parameters, thus: tone(pin, frequency) tone(pin, frequency, duration) The pin is the digital pin being used to output to the piezo and the frequency is the frequency of the tone in hertz. There is also the optional duration parameter in milliseconds for the length of the tone. If no duration is specified, the tone will keep on playing until you play a different tone or you use the noTone(pin) command to cease the tone generation on the specified pin. Finally, you run a delay of 2 milliseconds between the frequency changes to ensure the sine wave rises and falls at the speed you require: delay(2);

1. Add a new class to the SecurityLib directory called StringEncryptorException with code as follows: using System; using System.Collections.Generic; using System.Text; namespace SecurityLib { public class StringEncryptorException : Exception { public StringEncryptorException(string message) : base(message) { } } } 2. Add another new class to the SecurityLib directory called StringEncryptor with code as follows: using using using using using System; System.Collections.Generic; System.Text; System.Security.Cryptography; System.IO;

While this XML structure is not exactly a model of space efficiency, it will suffice for a demo. The Java code now must read in that XML file, parse out the words, and put them someplace for the list to pick up:

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If you are wondering why you didn t put the 2 milliseconds into the duration parameter of the tone() command like this tone(8, toneVal, 2); it s because the for loop is so short that it will change the frequency in less than 2 milliseconds anyway, thus rendering the duration parameter useless. Therefore, a delay of 2 milliseconds is put in after the tone is generated to ensure that it plays for at least 2 milliseconds before the for loop repeats and the tone changes again. You could use this alarm generation principle later when you learn how to connect sensors to your Arduino. Then you could activate an alarm when a sensor threshold has been reached, such as if someone gets too close to an ultrasonic detector or if a temperature gets too high. If you change the values of 2000 and 1000 in the toneVal calculation and the length of the delay, you can generate different alarm sounds. Have some fun and see what sounds you can make!

namespace SecurityLib { public static class StringEncryptor { public static string Encrypt(string sourceData) { // set key and initialization vector values byte[] key = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 }; byte[] iv = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 }; try { // convert data to byte array byte[] sourceDataBytes = System.Text.ASCIIEncoding.ASCII.GetBytes(sourceData); // get target memory stream MemoryStream tempStream = new MemoryStream();

public class StaticFileDemo extends ListActivity { TextView selection; ArrayList<String> items=new ArrayList<String>(); @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.main); selection=(TextView)findViewById(R.id.selection); try { InputStream in=getResources().openRawResource(R.raw.words); DocumentBuilder builder=DocumentBuilderFactory .newInstance() .newDocumentBuilder(); Document doc=builder.parse(in, null); NodeList words=doc.getElementsByTagName("word"); for (int i=0;i<words.getLength();i++) { items.add(((Element)words.item(i)).getAttribute("value")); } in.close(); } catch (Throwable t) { Toast .makeText(this, "Exception: "+t.toString(), 2000) .show(); } setListAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, items)); } public void onListItemClick(ListView parent, View v, int position, long id) { selection.setText(items.get(position).toString()); } }

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