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Then, the second simplest task is to enhance an existing module The already existing code can serve as a sample It s just necessary to plug into it, but you don t need much knowledge in most cases you re led by example It s much easier than writing something from scratch However, guess which task the students took Nobody fixed any other bugs, one person donated a patch to some module, and the rest wrote their own code Simply put, students are afraid of foreign code That is not good news for them, because as soon as they leave the university, they ll spend most of their work time digging out bugs in legacy code they inherit from someone else The other thing to nitpick regarding the current state of computer science education is the way that it measures the quality of student code.

With a single analog input we can therefore read the voltage level on a sensor channel and detect any of those four possible states with just one pair of wires to the sensor.

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At the time I attended my university, we just wrote a program, showed it to the teacher, and either got approval or not However, at that time access to the Internet was rare and the open source movement was not as strong as it is today That is why I would expect some progress since my university days, especially given the power of the Internet and the number of existing open source projects seeking contributions However, there doesn t seem to be any progress Students still create their own projects from scratch, show them to the professor, and that s it The project is then forgotten It would be much more valuable to show students how to work with existing code For example, they could be evaluated on the integration of their solution into some existing open source project The best grade would be for someone.

Start assembly by fitting the screw terminal connections onto the prototyping shield. Many types of sensors, including PIRs, require a 12V power supply so we ll actually be running a 4-core cable to each sensor with one pair for power and one pair for the sensor output. Snap the screw terminals together into pairs to form four sets of four connections each plus one separate pair for the connection from the 12V power supply. In this system, the power for the sensors will be kept totally separate from the Arduino and will have no connection to it at all it doesn t even need a common ground. The output from a PIR is typically a tiny reed relay that provides total electrical isolation from the device itself, and the tamper switch is

also bundled with it and provide out-of-the-box solutions for specific needs like administrative interfaces and user authentication. In the example applications used in this book, you ll see all of these features, and more, in action. So let s dive in.

likewise a simple switch output. By keeping the power supply for sensors totally separated from the Arduino, we avoid possible problems with noise induced in the supply, and also protect the system against possible attack methods such as shorting the power supply going to a sensor to disable the entire security system. If that particular attack was attempted with this system, the sensors would go offline and their outputs would drop open, but the Arduino would continue running and could trigger an alarm. Many commercial security systems scrimp on power connections and provide only one pair of connections for all sensors connected to the system. If you wanted to save space on the shield, you could do that here as well, but the downside is that you then have to twist all the sensor positive leads together and all the negative leads together and jam them into a single pair of screw terminals. That approach can be awkward and frustrating and some of the power leads may tend to fall out, so we prefer to provide dedicated power supply connections for every sensor channel. Using this approach we can comfortably fit connections for four PIRs, plus the input from a 12V power supply, on one shield (see Figure 6-6). Of course, most Arduino models have a total of six ADC inputs and we re wasting two in this project, so if you can find smaller screw terminals or choose to switch to plugs/sockets instead you could probably fit connections for six PIRs on a single shield.

who manages to get the code into the project s code base, as that is not just about coding skills, but about communication and the ability to work with the rest of the community. Average grades would be for those who make the project work, but whose work is refused for integration as not being good enough. This could be beneficial for teachers, as most of the evaluation is done by the members of the community. Still, I have not found any signs of this.

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