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Finally, there s the main program loop: void loop() You start off by requesting the temperatures from the DallasTemperature library sensors.requestTemperatures(); then call your getTemperature function, passing it the address of the sensor getTemperature(insideThermometer); that is then displayed in the serial monitor window. Serial.println(tempC); Next you check that temperature to see if it has reached or exceeded your high threshold. If it has, then the appropriate e-mail is sent. However, you only want to send one e-mail every (emailInterval*1000) seconds so check also that millis() is greater than the last time the e-mail message was sent (lastMessage) plus the interval time. If true, the code is executed. if (tempC >= HighThreshold && (millis()>(lastMessage+(emailInterval*1000)))) { The user is informed and then the two lines that make up the e-mail message are sent: Serial.println("High Threshhold Exceeded"); char message1[] = "Temperature Sensor\0"; char message2[] = "High Threshold Exceeded\0"; The sendEmail function is then called, passing it the parameters that make up the subject, message line one and two, and the current temperature: sendEmail(subject, message1, message2, tempC); If the high teperature threshold has not been reached, you check if it has dropped below the low temperature threshold. If so, carry out the same procedure with the appropriate message. else if (tempC<= LowThreshold && (millis()>(lastMessage+(emailInterval*1000)))) Serial.println("Low Threshhold Exceeded"); char message1[] = "Temperature Sensor\0"; char message2[] = "Low Threshold Exceeded\0"; sendEmail(subject, message1, message2, tempC); } Finally, you check if there is any data ready to be received back from the client (after an e-mail has been sent) and display the results: if (client.available()) {checkEmail();} This data is useful for debugging purposes.

CartID is the unique ID you ll generate for each shopping cart. Unlike the other unique identifiers you ve seen so far, this is not an integer field; instead, it s a Char(36) field, which will be filled with a GUID string. A GUID (Globally Unique Identifier) is a value guaranteed to be unique across time and space. Two generated GUIDs will never be the same. The string representation of a GUID has 36 characters: The GUID itself is 32 bytes long, and its string representation also contains 4 separating dashes. An example of a GUID is ff8029a7-91e2-4ca2-b4e7-99a7588be751.

public class LaunchDemo extends Activity { private EditText lat; private EditText lon; @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.main); Button btn=(Button)findViewById(R.id.map); lat=(EditText)findViewById(R.id.lat); lon=(EditText)findViewById(R.id.lon); btn.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { String _lat=lat.getText().toString(); String _lon=lon.getText().toString(); Uri uri=Uri.parse("geo:"+_lat+","+_lon); startActivity(new Intent(Intent.ACTION_VIEW, uri)); } }); } }

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Tip When you know the exact length of the strings you re storing in a table field, it s better to use the Char

This project has given you the basic knowledge for sending an e-mail from an Arduino with Ethernet Shield. You can use this to send alerts or report whenever an action has occurred, such as a person has been detected entering a room or a box has been opened. The system can also take other actions, i.e. to open a window if the temperature in a room gets too hot or to top up a fish tank if the water level drops too low. Next, you will learn how to send data from an Arduino to Twitter.

The second field is ProductID, which, as expected, holds the ID of an existing product. To ensure that the cart doesn t hold any nonexistent products, you need to enforce the One-to-Many relationship between the ShoppingCart and Product tables through a FOREIGN KEY constraint. The relationship is tied between the ProductID columns in the ShoppingCart and Product tables.

Again you will use the circuit with the two temperature sensors. This time you will send regular updates about the status of the two sensors to Twitter. This will give you a simple system for checking on the status of any sensors you have connected to the Arduino. Twitter is a microblogging service that allows you to send miniature blog posts or tweets of up to 140 characters in length. The tweets are publically accessible to anyone who does a search or to those persons who have chosen to subscribe to (or follow) your blog. Twitter is incredibly popular and can be accessed from any web browser or from one of the many Twitter clients that are available, including mobile phone apps. This makes it ideal for sending simple short pieces of information that you can check while on the move. You will need to go to Twitter.com and create a new account. I recommend creating an account just for tweeting from your Arduino. As of August 31,2010, Twitter changed its policy regarding third party apps accessing the website. An authentication method known as OAuth is now used that makes it very difficult to tweet directly from an Arduino; prior to this change it was an easy process. Tweeting, at the moment, can only be done via a third party. In other words, you sending the tweet to a website, or proxy, that will tweet on your behalf using the OAuth token (authorization code). The current Twitter library uses this method. Once you have your account set up, enter the code below.

If you fill in a location (e.g., 38.8891 latitude and -77.0492 longitude) and click the button, the resulting map is more interesting, as shown in Figure 18 2.

key). This makes sense because a particular product can exist only once in a particular shopping cart, so a (CartID, ProductID) pair shouldn t appear more than once in the table. If the visitor adds a product more than once, you just increase the Quantity value.

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