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Figure 12-5. Pressure transducer mounted above tank The second option is to mount the entire Arduino and sensor inside a waterproof container submerged at the bottom of the tank with a short hose exposed to the water and a long hose running up and exiting the tank to provide an atmospheric pressure reference (see Figure 12-6). You ll also need to pass the power and data cabling up through the tank, and it goes without saying that electricity and water don t mix, so you need to be very careful to totally seal the assembly! Plastic project boxes with waterproof O-ring seals are fairly commonly available, and combined with waterproof cable glands and liberal doses of silicone sealant you should be able to build an assembly that can withstand long-term submersion without problems. Getting access to the Arduino for maintenance, though, could be quite tricky, and condensation in the atmospheric tube could build up over time.

1. In a temporary directory (not one on your Python import path), create an empty setup.py file and a copy of your application s directory, containing its code. 2. Fill out the setup.py script with the appropriate information. 3. Run python setup.py sdist to generate the package; this creates a directory called dist that contains the package.

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public static interface Impl { public void close() throws IOException; public void flush() throws IOException; public void write(String str, int off, int len) throws IOException; public void write(char[] arr, int off, int len) throws IOException; } public static interface ImplSeq { public void close() throws IOException; public void flush() throws IOException; public void write(CharSequence seq) throws IOException; } } Now compile time checks completely replace the problems with the default implementation of append(CharSequence) that so complicated the runtime behavior when BufferedWriter was subclassable. You can implement a Writer.Impl and use an appropriate factory method to create the instance of Writer. Alternatively, you can implement Writer.ImplSeq, use the new factory method, and provide the new method append(CharSequence). The decision is fully done during compile time and doesn t require any runtime checks. Indeed, using final classes for client APIs, using interfaces for provider APIs, and bridging them with a factory methods pattern might sound complicated, but it is built from the basic patterns that are commonly used, well understood, and accepted. The new API uses factory methods, it hides as much as possible, and it clearly defines interfaces for clients (the final class) as well as for providers (those two implementation interfaces). So, it s not that complicated to use such an API. Moreover, it solves a lot of evolution problems pretty well. Although writing the initial version might require more work, separating client APIs from provider APIs greatly simplifies future evolution and prevents problems created by the fact that delegation and subclassing don t work well together.

Figure 12-6. Pressure transducer and Arduino mounted inside tank The third option is a clever variation on the previous approach that replaces the project box with a length of large-diameter pipe, sealed at one end and protruding from the bottom of the tank all the way up out of the water, or alternatively, a sealed box with a pipe attached. An Arduino with two shields stacked on top will slide easily into the end of a 75mm (3-inch) PVC pipe, and you can then pass a short length of hose out through a cable gland to sample the water pressure near the bottom of the tank. A 2m length of 75mm pipe can be inserted vertically into a tank with the top protruding, but be warned that it will displace a surprisingly large volume of water and will be extremely buoyant, so you will need to attach a significant weight to hold it down (see Figure 12-7). You ll also need to make sure the top isn t directly exposed to the weather so the pipe fills up and drowns your Arduino first time it rains! And you ll be limited to using cabled Ethernet rather than WiFi for communications because a WiFi shield surrounded by several tons of water will have no range at all. Overall, though, this is a very practical way to do it and gives you reasonable access to the Arduino for future maintenance, but watch for corrosion over time since air can circulate so easily all the way down to the circuitry.

The previous section talked about the importance of splitting the API that people call from the API that people implement. Its motivation to separate the APIs for clients from those intended for service providers was mostly motivated by evolution problems. However, there is another interesting approach to looking at the separation of APIs: readability. Any API especially an API written in Java exhibits signs of locality: related things are expected to be defined next to each other. They should either be defined in the same class, in the same package, or as in the NetBeans case, in the same module. Locality is encouraged by

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