Download Getting Started with RFID: Identify Objects in the Physical by Tom Igoe PDF
By Tom Igoe
If you need to scan with radio frequency id (RFID), this ebook is the ideal position to begin. All you would like is a few event with Arduino and Processing, the power to attach simple circuits on a breadboard with jumper wire—and you’re sturdy to move. You’ll be guided via 3 hands-on tasks that allow you to adventure RFID in action.
RFID is utilized in quite a few purposes, similar to picking out shop goods or gaining access to a motorway with an EZPass approach. once you construct all the book’s initiatives in succession, you’ll have the information to pursue RFID functions of your own.
* Use Processing to get a feeling of the way RFID readers behave
* attach Arduino to an RFID reader and realize the best way to use RFID tags as keys
* Automate your place of work or domestic, utilizing RFID to show on structures while you’re current, and switch them off for those who depart
* Get a whole checklist of fabrics you would like, in addition to code samples and useful illustrations
* take on each one undertaking with easy-to-follow motives of the way the code works
Read Online or Download Getting Started with RFID: Identify Objects in the Physical World with Arduino PDF
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Additional info for Getting Started with RFID: Identify Objects in the Physical World with Arduino
Sample text
For most development purposes, we can focus on five commonly-used verbs. 16 | Chapter 2: Fundamentals GET A GET request is used to ask a server to return a representation of a resource. ) respond with the markup necessary for your browser to render the page markup. ) are requested by the browser as further GETs. POST A POST is used to submit data to a web server. Arguably the most ubiquitous example of a POST is the humble login form. A user fills in his credentials, clicks a button, and the browser submits the data via a POST to the server.
Either approach for creating the symbol is acceptable. Anecdotally, the use of #to_sym seems to be more common in practice. If you want to get technical, one could also use #intern as well. Passing Data into Views Information constructed in the back-end of the application can be shared to the frontend view through the use of instance variables, as shown in Examples 2-18 and 2-19. Example 2-18. Creating instance variables for use in a view require 'sinatra' get '/home' do @name = 'Random User' erb :home end Example 2-19.
Sinatra provides a halt method for just this purpose as shown in Example 2-9. Example 2-9. 1... 1 500 Internal Server Error Connection: close Date: Sat, 17 Sep 2011 21:09:42 GMT Content-Type: text/html;charset=utf-8 Content-Length: 0 Closing connection #0 A status code of “500 Internal Server Error” was returned, and the text we entered was not delivered to the client (further verified by a Content-Length header of value 0). Passing a Request Depending on the structure of your application, there may be instances where you’d like to pass processing on to the next best matching route (if available).