Download Building Wireless Sensor Networks: with ZigBee, XBee, by Robert Faludi PDF

By Robert Faludi

Get able to create disbursed sensor platforms and clever interactive units utilizing the ZigBee instant networking protocol and sequence 2 XBee radios. by the point you're midway via this fast paced, hands-on consultant, you'll have outfitted a chain of valuable initiatives, together with an entire ZigBee instant community that can provide remotely sensed data.

Radio networking is developing revolutions in volcano tracking, functionality artwork, fresh power, and patron electronics. As you persist with the examples in every one bankruptcy, you'll the right way to take on inspiring initiatives of your personal. This useful consultant is perfect for inventors, hackers, crafters, scholars, hobbyists, and scientists.
* examine an collection of functional and fascinating venture principles
* Prep your ZigBee toolbox with an intensive procuring checklist of elements and courses
* Create an easy, operating ZigBee community with XBee radios in lower than hours -- for less than $100
* Use the Arduino open resource electronics prototyping platform to construct a sequence of more and more complicated tasks
* Get accustomed to XBee's API mode for developing sensor networks
* construct absolutely scalable sensing and actuation structures with reasonably cheap parts
* find out about strength administration, resource routing, and different XBee technical nuances
* Make gateways that connect to neighboring networks, together with the net

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6. If desired, change the values of the three variables, save the file, and run the script again B. If you assign another value to an existing variable (say $book), the new value will overwrite the old one. For example: $book = 'High Fidelity'; $book = 'The Corrections'; /* $book now has a value of 'The Corrections'. */ PHP has no set limits on how big a string can be. It’s theoretically possible that you’ll be limited by the resources of the server, but it’s doubtful that you’ll ever encounter such a problem.

Chapter 8 discusses error reporting in detail. To see how PHP handles the different form input types, print out the $_REQUEST['age'] and $_REQUEST['gender'] values D. D The values of gender and age correspond to those defined in the form’s HTML. Magic Quotes Earlier versions of PHP had a feature called Magic Quotes, which has since been deprecated and will eventually be removed entirely. Magic Quotes—when enabled—automatically escapes single and double quotation marks found in submitted form data (there were actually three kinds of Magic Quotes, but this one kind is most important here).

To improve upon this, you could write $address = $city . ', ' . $state; so that a comma and a space are concatenated to the variables as well. Because of how liberally PHP treats variables, concatenation is possible with strings and numbers. Either of these statements will produce the same result (Seattle, Washington 98101): $address = $city . ', ' . $state . ' 98101'; $address = $city . ', ' . $state . ' ' . php to use this new operator. To use concatenation: 1. 6) in your text editor or IDE. 2.

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