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Although the set of validations on the Validator framework are quite comprehensive, you might want to run your own validations alongside those available in the Validator framework. There are two ways of doing this: Put in a validate() function on your ValidatorForm subclass. You d take this approach if the custom validation isn t likely to be reused in other parts of your application. Extend the Validator framework itself by creating a new validator. You d take this route if there s a strong case for reuse. In most cases, putting in a validate() function should suffice. Use the second alternative only after much thought, since validators should be generic, if only to the problem domain of your web application. Otherwise, you d run into potential maintenance issues. Can you see why We ll take a look at both approaches in this section.

B00010100 001111, but as it is sent msb (most significant bit) first and lsb (least significant bit) last, the number is sent in reverse bit order, i.e. B111100000101000. Another address you will be using is the scan limit. Remember that the MAX7219 is designed to work with 7-segment LED displays (see Figure 7-7).

Implementing validate()

As I mentioned earlier, one way of implementing your own validations in addition to the standard ones is to implement the validate() function. We ll take up the RegistrationForm class again (see Listing 15-4), and add custom validations to detect that the given password isn t in a list of common words like password

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Figure 7-7. 7-segment LED display (image by Tony Jewell) The scan limit decides how many of the 8 digits are to be lit. In your case, you are not using 7segment displays, but 8 8 dot matrix displays. The digits correspond to the columns in your display. You want all 8 columns to be enabled at all times, hence the scan limit register will be set to B00000111 (digits are 0 to 7 and 7 in binary is B111). The decode mode register is only relevant if you are using 7-segment displays, so it will be set to B00000000 to turn decode off. Finally, you will set the shutdown register to B00000001 to ensure it is in normal operation and not shutdown mode. If you set the shutdown register to B00000000, then the current sources are all pulled to ground which then blanks the display. For further information about the MAX7219 IC, read the datasheet. Just read the parts of the datasheet that are relevant to your project and you will see that it is a lot easier to understand than it appears at first. Now that you (hopefully) understand how the MAX7219 works, let s take a look at the code and see how to make it display scrolling text.

Our experience heightened our awareness of how important good corporate governance is and how it must be part of the culture established at the Board level and pushed down through management to the entire organization. We did have a daunting experience. But what company right now could argue that they have not The market cap of the Fortune 1000 declined drastically during the 2008 2009 financial crisis. With the Dow Jones Industrial Average going down from over 14,000 to just over 6,000, many companies had their own perilous experiences. Who could argue that maintaining the status quo makes sense under these circumstances Something needs to change, and improved governance can help bring about the change that s needed.

or secret. Listing 15-11 shows the validate() function that you d add to RegistrationForm in order to achieve this functionality.

The first thing you do at the start of the sketch is to load in the two libraries that you will be utilizing in the code: #include <avr/pgmspace.h> #include <TimerOne.h> The first library is the pgmspace or Program Space utilities. The functions in this library allow your program to access data stored in program space or flash memory. The Arduino with the ATmega328 chip has 32KB of flash memory (2KB of this is used by the bootloader, so 30KB is available). The Arduino Mega has 128KB of flash memory, 4KB of which is used by the bootloader. The program space is exactly that, the space that your program will be stored in. You can utilize the free unused space in the flash

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