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It is important to be aware of the distinction between two different ways of developing Django applications. One method, which I used in the last chapter, uses the manage.py startapp command to create an application module inside the project s directory. While this is easy and convenient, it does have some drawbacks, most notably in the fact that it couples the application to the project. Any other Python code that wants to access that application needs to know that it lives inside that particular project. (For example, to import the SearchKeyword model from a separate piece of code, you d have to import it from cms.search.models instead of just search.models.) Any time you want to reuse the application, you need to either make a copy of the project or create a set of empty directories to emulate the project's directory structure. The alternative is to develop a standalone application, which acts as an independent, selfcontained Python module and doesn t need to be kept inside a project directory in order to work correctly. A standalone application is much easier to reuse and distribute, but it does involve a bit more work initially to set up: the manage.py startapp command can t create things automatically for you unless you re developing an application that s coupled to a particular project. While there are cases where you ll develop one-off applications that don t need to be reusable or distributable (and in those cases, it s perfectly fine to develop them inside of, and coupled to, a particular project), in general, you ll get more benefit from developing standalone applications that can be reused in many different projects. That s how you ll be working for the rest of this book.

Arduino makes a great building block for data acquisition and logging systems, including sensors commonly used in home automation such as temperature sensors. By combining an Arduino and a few DS18B20 temperature sensors, you can install sensors around your home or office and access an up-tothe-moment report using a web browser. Readings can also be logged and graphed over time, showing trends or measuring the effectiveness of your home heating or cooling systems. By placing sensors outside the house, inside your ceiling cavity, and inside every room, you can plot how well your home maintains its temperature when climate conditions change. The information can also be used as part of the feedback loop for a control system, such as to control active heating or cooling, or to trigger servos or linear actuators to open and close windows and passive ventilation systems. The required parts are shown in Figure 7-1, and the complete schematic is in Figure 7-2.

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I already discussed in the section The First Version Is Always Easy in 2 that creating the first version is easy I also mentioned that the first version is unlikely to be perfect These two observations indicate that nearly every API needs to evolve over time The requirements for the API will change as time goes by, and those that might have been valid in the past might no longer be applicable Also, in every program there is at least one bug Bugs need to be fixed from time to time, which leads to another commonly held belief: fixing a bug usually introduces two new ones These common observations are true for any software system and APIs are no exception Now is the right time to give up and admit that the first version is never perfect.

1 Arduino Duemilanove, Arduino Pro, Seeeduino, or equivalent 1 Seeed Studio Ethernet Shield or nuElectronics Ethernet Shield with prototyping shield 6 DS18B20 Dallas 1-wire temperature sensors (Note: not DS18S20) 6 4K7 1/4W resistors 6 PCB-mount 3-pin male connectors 6 Lead-mount 3-pin female connectors Twisted-pair cable or alarm cable (minimum 3 conductors) Source code available from www.practicalarduino.com/projects/onlinethermometer.

Regardless of how much you try, the released version will contain bugs and users will attempt to use it for valid tasks that are beyond the scope of your design Short of owning a crystal ball, you can t do much about this except accept it as a fact of life This observation need not lead to pessimism The fact that the API needs to evolve isn t a sign of anything bad, but simply a recognition of reality If you design for evolution, preferably in the first version, evolution should be possible without causing problems for API users Every API writer needs to have an evolution plan; that is, to know on a strategic level what will happen to the API in future releases There are two possible approaches to such a plan.

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