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The ATMega168, like all microcontrollers, is limited in its ability to provide current to external devices. When the internal drive capabilities are insufficient, it is necessary to employ additional circuitry to correctly and safely switch the load in question. Before considering the type of device that best suits your application, you need to consider four parameters: current, voltage, switching frequency, and isolation. The first three are, in a sense, hard numbers; the final is more of an engineering decision. Current and voltage are interrelated (as we discussed in 1), so switching high currents at low voltages is a different engineering problem than low currents at very high voltages, for example. For the purposes of this discussion, we can consider high voltages to be anything over 24V, and high currents as anything over a few hundred mA. Switching frequency will vary enormously with application. Isolation, as the name suggests, is the practice of having electrical and/or physical separation between two parts of a circuit, typically the low and high power sections. Isolation is necessary for safety reasons when high voltages are involved and/or mains switching is the task at hand. It can also be

with it as well. It might be interesting to know the test coverage of your library, as that might identify places that are not tested at all. It might also be interesting to be notified of commits that integrate changes to the library that decrease the test coverage and thus might destabilize the library in the future.

prudent for high-current applications, even at lower voltages, simply to avoid the risk of damaging the relatively sensitive circuitry in the Arduino and/or connected devices.

ith the addition of the forms for user submissions, your code-sharing application is nearly complete. Only three features are left to implement from the original list. Then you can wrap up by rounding out the application with a few final views. Let s get started.

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For practical applications, there are two broad types of switching devices available: semiconductor and mechanical. Semiconductor devices include a few different types of transistors, optocouplers, and solid state relays (SSRs); mechanical devices come down to different types of relays. Solid state devices are often physically smaller, consume less power, and are able to switch more rapidly than mechanical devices because there are no moving parts. The lack of moving parts nominally makes semiconductors more reliable, but well-designed relay circuits will often last just as long. Only certain classes of semiconductor devices provide electrical isolation between input and output. Some solid state devices are a little trickier to use and less forgiving if used incorrectly. Mechanical switching devices have the advantages of providing electrical isolation, being pretty bulletproof to design with, and are easily understood. On the downside, they tend to need higher drive currents and so can themselves need additional circuitry to be driven from the Arduino. They are also limited in switching frequency. This latter limitation can manifest as either being unable to switch fast enough to support higher frequencies or wearing out too quickly limited number of cycles. As a rule of thumb, switching frequencies of 1Hz or faster for any continually operated circuit with a mechanical relay is marginal at best. Having discussed some of the general issues in selecting output circuits, we now look at some practical examples.

While writing tests, developers often ask how many of them should be written The simple answer is to write tests whenever they are useful The more precise and less definitive answer follows: Various tools out there help to measure test coverage We ve selected EMMA (http://emma sourceforgenet) for measuring the coverage of our application code by our tests For example, when invoked from the pop-up menu of a project from NetBeansorg, it instruments the application code and invokes automated tests on it While running, it collects information about all the called methods, visited classes, and lines, and then it shows a summary in a web browser Counting coverage by visited methods is not a very demanding criterion However, it can be surprisingly difficult to get close to 100 percent coverage Even if you succeed, there is no guarantee that the resulting application code will work correctly.

Reed relays consist of a switching element (the reed ) within a coil of wire. When current flows through the energized coil, the resulting magnetic field closes or, in some cases, opens the contacts. If the switch is open when the coil is off, the relay is said to be Normally Open or NO. If the switch is closed then the device is Normally Closed or NC. Some reed relays have both NC and NO contacts. The construction of the relay provides a high degree of electrical isolation, but because the contacts within the reed are quite small, the contacts have limited current- and voltage-handling capability. However, the small size of the contacts has an upside: only quite small currents (typically under 15mA) are needed to keep the coil energized and the contacts closed. Reed relays commonly have coil voltages designed to be compatible with 5V digital circuitry, and so in many cases can be driven directly by the Arduino. Figure 16-5 is a schematic of a reed relay connected in this manner.

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