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Relays are a variation on the reed relay previously described and differ primarily in their mechanical construction. Typically, the coil of wire, or solenoid, causes a lever to move that opens and/or closes the relay contacts. Relays typically have higher voltage and current ratings at the expense of slightly slower switching speed and higher coil current. In the advantages column, these higher voltage and current ratings are joined by greater flexibility in contact configurations multiple poles (separate switches) and changeover (NC + NO) is commonplace. The somewhat higher current demands of a conventional coil relay generally precludes driving them directly from the Arduino. If only one or two relays are being used, then a simple bipolar transistor, as discussed in the next section, will do the job nicely. If four or more relays are being used, it is worth considering a specialized transistor array or driver chip, which we touch on later in the Transistor Arrays section.

def __unicode__(self): return "%s bookmarked by %s" % (selfsnippet, selfuser) def save(self): if not selfid: selfdate = datetimedatetimenow() super(Bookmark, self)save() There s only one new feature in use here, and that s the related_name argument to the foreign key pointing at the User model The fact that you ve created a foreign key to User means that Django will add a new attribute to every User object, which you ll be able to use to access each user s bookmarks By default, this attribute would be named bookmark_set based on the name of your Bookmark model For example, you might query for a user s bookmarks like so: from djangocontribauthmodels import User u = Userobjectsget(pk=1) bookmarks = ubookmark_set.

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That is why we suggest that people use code coverage tools as a sanity check that something is not under-tested. However, you need to remind yourself that there might still be bugs in an application, no matter how high the code coverage is. To help fight the strange shifts of an application s amoeba shape, we suggest writing a test whenever something breaks. When there is a bug report, write a test to verify it and prevent regressions. That way, coverage will be focused on the code that matters: the parts that were actually broken.

Figure 16-6 shows a relay being driven from the Arduino using a conventional bipolar transistor to provide additional current-handling capability. Note that like the reed relay circuit in Figure 16-5, a back-EMF diode is used. We describe this circuit further in the next section.

In addition to these regular tests, your library needs a lot of special care. It s likely that you want to publish a Javadoc with each build and make sure it doesn t contain broken links. Moreover, you might be influenced by this book s opinion that the Javadoc is not enough. In such cases, you probably want to find a way to describe other APIs and annotate them in a way that will be easily recognizable to your API s users. Potentially, you also want to assign your API stability categories, as discussed in the section Life Cycle of an API in 4. Last but not least, you want to notify users of your API about the latest changes that have been made. For all these reasons, you might want to employ the NetBeans Javadoc extensions.

Note Mechanical contacts like those used in reed relays, conventional relays, and switches have a minor design quirk that you should be aware of if you re designing for high-reliability applications. With the exception of exotic wetted contacts, it s desirable to ensure at least 10mA or so flows through the contacts when on in order to ensure they stay free of oxidization and corrosion. If you re just tinkering, it s pretty safe to ignore this, though!

all() However, this can create a problem: if you ever use any other application with a bookmarking system, and if that application names its model Bookmark, you ll get a naming conflict, because the bookmark_set attribute of a User can t simultaneously refer to two different models The solution to this is the related_name argument to ForeignKey, which lets you manually specify the name of the new attribute on User, which you ll use to access bookmarks In this case, you use cab_bookmarks, so once this model is installed and you have some bookmarks in your database, you ll be able to run queries like this: from djangocontribauthmodels import User u = Userobjectsget(pk=1) bookmarks = ucab_bookmarksall() Generally, it s a good idea to use related_name any time you re creating a relationship from a model with a common name.

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