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Unfortunately, the ID series RFID modules all have one major annoying idiosyncrasy: instead of having their pins spaced on a 0.1in imperial grid like the vast majority of electronic parts, they re spaced on a 2mm metric grid. Since 0.1in is about 2.54mm, that means it s impossible to simply plug an ID-12 module into a breadboard or fit it on a prototyping shield unless you either do surgery on the shield to drill additional holes or mount the ID-12 on a breakout board that converts it to a standard 0.1in grid. For this project we wanted to mount the module behind a blank wall plate separated from the Arduino and shield so the problem isn t quite as frustrating as it could have been, but it still makes things awkward. If all else fails you could solder wires directly to the appropriate pins on your ID-12, but that won t provide much mechanical support. An alternative is to buy a generic prototyping board with a nonstandard 2mm grid, but that tends to be very expensive and not commonly available. Or you could etch a tiny custom circuit board that provides the correct pin spacing for the ID-12 module plus mounting pads, or buy one ready-made from a supplier such as SparkFun. Because this is such a simple PCB, you can easily fabricate it yourself at home using either a resist pen to draw it out by hand or photographic exposure techniques. If you are using a PCB, start by inserting your ID-12 module into the board and soldering the pins in place. Then fit the end of a length of four-core cable, such as a length stripped from a ribbon cable, to

stability-related problems when migrating to the latest 26 versions Experience shows that sticking with an older version of a library is a possible and acceptable solution However, this works only as long as there is no second user of the same library someone who needs a different incompatible version from the one you re using At that point, you encounter the problem of the mutual coexistence of multiple versions of the same library This is sometimes possible, especially if the two instances of the same library are well isolated and don t know about each other However, sometimes this approach might not work at all Even the decision about whether there is a nonconflicting configuration to enable all modules in the system when multiple incompatible versions of a library are re-exported by other libraries seems to be an NP-complete problem a problem that is hard to solve.

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the +5V (pin 11), Gnd (pin 1), TX (pin 9), and RX (pin 8) connections. Connecting the reader on a PCB produces a mechanically strong subassembly that can be mounted separately and then easily connected or disconnected as required. It also means you can create a longer cable and mount the reader totally separately: you may want to have the reader mounted near a conveyor belt to track items passing along it, or on the end of a pole so you can reach up high to read tags attached to boxes on shelving in a storage facility. Or, as you ll see at the end of this project, on a pole so it can be inserted into a penguin burrow to read RFID tags surgically implanted in a colony of Little Penguins! To put the ID-12 module into the correct mode it s also necessary to make a few additional connections between different pins on the module. Pin 2 is the reset pin, which is active-low, so link it to pin 11 (+5V) to prevent the unit from resetting. Pin 7 is the format (mode) pin. When held high, it puts the module into Wiegand26 mode to emulate an older Wiegand-format reader. If connected to pin 10, the module goes into a magnet emulation mode in which it pretends to be a magnetic card reader. If held low the module goes into ASCII mode, which happens to be exactly what we want. Link pin 7 to pin 1 (ground) for operation with an Arduino (see Figure 14-13).

The details are beyond the main topics of this book; in case you are interested visit http:// reexportapidesignorg Third, you can use wrappers A possible solution one that eliminates the re-export problems completely is to create a wrapper around the imported API and not to show it in your own API signatures at all The library can still be used internally, but it is invisible from the outside, where it is a hidden implementation detail: public final class Query { public static final class Sequence { private String data; Sequence(String data) { thisdata = data; } public int length() { return datalength(); } public char charAt(int i) { return data.

Figure 14-13. Schematic of ID-12 module connection to Arduino serial interface Fit a 4-pin oriented female header to the other end of the cable to match the connections on the shield, keeping in mind that you need to reverse TX/RX on the RFID module compared to the Arduino. The TX pin on the module (pin 9) needs to go to RX (pin 4) on the Arduino. We don t use it with the ID12 module, but for completeness you can also connect the RX pin on the module (pin 8) to the Arduino s TX on pin 5. Mount the ID-12 module itself inside your case or front panel, keeping it flat against the case. The read range can be quite limited and nearby metal could alter the tuning, so the closer you can get it to the location of the tag the more reliable it will be. For our prototype we mounted the ID-12 inside a blank wall plate along with the indicator LEDs (see Figure 14-14).

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