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The values chosen of 20k and 10k mean that for a 15V input, we will get 5V out; for 3V in, 1V out; and so on. We now have a simple way of monitoring voltages or inputs that are greater than the 5V or 3V3 limit on Arduino input pins. This same circuit can be used for digital and analog inputs. While the simple divider shown will work fine in benign environments, in noisier or less controlled situations, such as monitoring a battery or the state of the headlights of your car, it s prudent to add some additional circuitry. This can be as simple as adding a Zener diode, as shown in Figure 16-10. Zener diodes in this configuration act as a voltage-sensitive switch of sorts. While below their operating voltage, their resistance is very high essentially they re off. Once the operating voltage is reached, the resistance drops dramatically. In the case of our circuit, this effectively ensures that the voltage is clamped at 5.1V. A word of caution here: Zener diodes used in this manner aren t perfect and might not catch very fast transients or spikes. Further, if they are used to protect an analogu input, their tendency to start conducting below their rated voltage can have the effect of introducing nonlinearity into the circuit near the maximum input.

Figure 16-10. Zener-protected input conditioning circuit Oh, and please don t even think about using a voltage divider to reduce mains voltage down into an Arduino pin without proper isolation!

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Although the Javadoc of getPath() warns that this is just a relative path, it was accidentally also the actual path on the disk in the case of file objects representing local files Quite a few people started to rely on new File(togetPath()) really existing, and as a result we broke their code when we wanted to change the relative root D j vu In a similar case, we discovered that providing discoverable string names to graphical user interface (GUI) components in an API caused abuse whereby innocent changes to that GUI component unexpectedly broke clients It s clear that any available information from a component in a modular system can and will be abused So, it s important to be clear in specifying what is and what is not part of the API contract..

This pattern, like the previous one for the admin, takes advantage of the pluggable URLs the include directive provides and says to use another URLConf module, django.contrib. flatpages.urls, for anything that matches the pattern. Save your urls.py and either refresh the page in your browser or navigate again to http://127.0.0.1:8000/first-page/. It s still going to display an error, but now you re closer to having the simple CMS working (see Figure 2-4).

Note A variable resistor, or pot, forms a voltage divider if wired in a similar manner to that in Figure 16-9. One end of the pot goes to 5V, the other end to ground, and the wiper (typically the center pin) to the Arduino input. This can provide an inexpensive way of adding a knob to a project to set some value.

In fact, real projects are worse! The model of an endless fixing odyssey follows only a single feature of a project. Real projects tend to have tens, thousands, or even more individual features. Those features can be watched individually. However, they don t change synchronously and they don t live in a vacuum. They influence each other. As a result, a fix that moves one feature closer to the dreamed state can cause a regression in another feature. That means that a single feature might even get to the target state, though it might leave that state as soon as you fix another feature (see Figure 11-5).

Earlier in this section we discussed output circuits that electrically isolated the switched device from the Arduino. Often, it s desirable to go the other direction and isolate a signal we re monitoring from the Arduino. Once again, optocouplers come to the rescue. The circuit in Figure 16-11 shows a simple isolated digital input. The input side can be virtually any voltage, provided the resistor value is selected so that no more than 10mA flows through the LED side of the optocoupler. We provide a few suggested values in the diagram for various input voltages.

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