By Tom Igoe
If you must test with radio frequency identity (RFID), this e-book is the right position to begin. All you wish 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 head. 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 settling on shop goods or getting access to a highway with an EZPass method. when you construct all of the book’s tasks in succession, you’ll have the information to pursue RFID purposes of your own.
* Use Processing to get a feeling of ways RFID readers behave
* attach Arduino to an RFID reader and notice easy methods to use RFID tags as keys
* Automate your place of work or domestic, utilizing RFID to show on platforms while you’re current, and switch them off in the event you depart
* Get an entire checklist of fabrics you wish, in addition to code samples and important illustrations
* take on every one venture with easy-to-follow causes 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
That’s why I mounted the reader vertically on a wall, so that tags wouldn’t just lay on the antenna all the time. 26 Getting Started with RFID 5/Conclusion Despite what some authors would have you think, RFID is pretty far from being a “big brother” technology. The “identity” of each RFID tag is just a number. What you do with that information is up to you. There is no single universal RFID protocol, nor are there readers that can read every tag out there. There’s no secret database somewhere that holds all the RFID numbers and associates them with the things they’re attached to, or worse, the people who own those things.
RFID Meets Home Automation 25 Note that the reader lacks the ability to read multiple tags if more than one tag is in the field. That’s an important limitation. It means that you have to design the interaction so that the person using the system places only one tag at a time, then removes it before the second one is placed. In effect, it means that two people can’t hold their key tags to the reader at the same time. In other words, users of the system need to take explicit action to make something happen.
Switching Power with RFID The following sketch will toggle the state of each PowerSwitch Tail when the corresponding RFID tag is held up to the reader. begin(2400); // Initialize all the PowerSwitchTail controller pins. println(" turning ON"); } // Set the switch to the new state. digitalWrite(unit[thisTag], unitState[thisTag]); } lastRead = millis(); // mark the last time you got a good tag } } } The top part of the sketch is essentially the same as what you saw in the example in Chapter 3. 24 Getting Started with RFID This string contains the tag that’s currently being read.