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Moreover, one of the reasons why developers don t like to write documentation is that it s forgotten as soon as they finish the code That is not always true, but often enough to instill the concern of writing documentation With the working backwards style of work, this is prevented The press release will be needed when the project is finished, if not directly, then at least as a source of information for the marketing department The FAQs are something to be loved by end users or at least technical writers working on tutorials The need for use cases and the Javadoc is clear That is why the likelihood of convincing engineers to write good docs is increased, as they are not doing anything useless or duplicating something that has already been done before However, the order of things is important.

Charlieplexing is a technique that can be used to maximize the number of LEDs or switches that a microcontroller can address with a limited number of pins. It makes use of the fact that a modern microcontroller (ATMega/Arduino obviously included) can actually set its pins to one of three states: High, Low, or Input ( Hi-Z as it is sometimes called). We ll confine our remarks here to driving LEDs. The Practical Arduino web site has links for references on this topic, if you wish to read up on more exotic setups, as well as links to the original articles on the topic. Figure 16-3 shows two LEDs connected between a pair of Arduino output pins through a dropping resistor. Note that the LEDs are connected with opposite polarity. Two pins to drive two LEDs is hardly remarkable, but bear with us a moment and we ll illustrate the basic principle.

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def add_snippet(request): if request.method == 'POST': form = SnippetForm(data=request.POST) if form.is_valid(): new_snippet = form.save(commit=False) new_snippet.author = request.user new_snippet.save() return HttpResponseRedirect(new_snippet.get_absolute_url()) else: form = SnippetForm() return render_to_response('cab/snippet_form.html', { 'form': form, 'add': True }) add_snippet = login_required(add_snippet) def edit_snippet(request, snippet_id): snippet = get_object_or_404(Snippet, pk=snippet_id) if request.user.id != snippet.author.id: return HttpResponseForbidden() if request.method == 'POST': form = SnippetForm(instance=snippet, data=request.POST) if form.is_valid(): snippet = form.save() return HttpResponseRedirect(snippet.get_absolute_url()) else: form = SnippetForm(instance=snippet) return render_to_response('cab/snippet_form.html', { 'form': form, 'add': False }) edit_snippet = login_required(edit_snippet)

Start with the press release and move step by step to the code Without this order, the methodology doesn t work Recently I wanted to write a press release for a finished project and it was painful The result was not good at all I started with the overview However, in the third paragraph I suddenly included a shell command line as an example of how to use the project This was not a press release at all! However, this is what happens to engineers: they want to share as much useful information as possible, which prevents them from writing press releases after the product is finished The only point at which they will succeed in this is before they start coding I have to admit that I ve enjoyed this style of work every time I ve tried it.

Figure 16-3. A two-pin charlieplexed LED display To turn LED1 on, we would make Output1 High, and Output2 Low. For LED2 we d do the opposite: Output1 Low and Output2 High. To turn the LEDs off, we can either set the pins to be inputs or the outputs to be the same state (both Low or both High) Figure 16-4 shows a more interesting arrangement. Here we drive six LEDs from just three pins by making use of the Arduino s ability to set a pin to be an input or an output in a high or low state. Referring to the diagram, to turn LED1 on, we d set DIO1 to be an output and to be high, DIO2 to be an output and low, and DIO3 to be an input. LED2 would be turned on by DIO1 being an output and set low, DIO2 being an output and set high, DIO3 still being an input. Jumping around, LED4 you d set DIO1 to be an input, DIO2 to be low, and DIO3 to be high. LED6 would call for DIO1 to be low, DIO2 to be an input, and DIO3 to be high, and so on. A bit of thought and careful programming will allow you to create a general-case piece of code that can turn on any LED required.

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