Figure 10-6 Comparison of LCD standard and custom characters in Software

Encoding Denso QR Bar Code in Software Figure 10-6 Comparison of LCD standard and custom characters

Figure 10-6 Comparison of LCD standard and custom characters
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on the display If not, the usual troubleshooting session is in order! To see the difference that the custom characters make, compare the display in Figure 10-5 with that of Figure 9-6 in 9 The difference may seem slight, but when there are three or four lowercase letters being displayed at one time, it s more pronounced Figure 10-6 shows a display from the original PICAXE Primer article that
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With the completion of our serial LCD project, we now have a powerful, stand-alone peripheral display for use with any PICAXE project All it requires is one output line, and its timing requirements are minimal; just be sure to send any Display Clear commands without additional characters in the same string and include a short delay after the transmission of each serial string If you keep those two caveats in mind, the serial LCD display will be able to keep up with all the data you want to send
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CHAPTER
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Interfacing Keypads
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NOW THAT WE HAVE A versatile output device to use in any PICAXE project, we re going to shift gears and focus on developing an input device for our projects We re going to start with a standard matrix keypad and, similarly to the LCD project we just completed, serialize it so that it can be used in any project, even one based on the little 08M2 Matrix keyboards are generally available in two sizes: four rows by three columns and four rows by four columns The key arrangement on the 4 3 version usually matches that of a landline telephone remember them The fourth column of a 4 4 keypad adds the letters A, B, C, and D, as shown in the following illustration
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We re going to be using a 4 by 4 keypad in this chapter, but the experiments and project can easily be modified for use with a 4 by 3 keypad if you prefer The specific keypad that appears in the chapter s photos is available on my website, but any matrix keypad you happen to have on hand should work just as well just be sure that it is, in fact, a matrix layout I have seen keypads that look similar to a genuine matrix, but actually have each key connected to its own line with a common connection to all the keys It would be possible to use this type of keypad, but the necessary modifications would be extensive The keypad that I am using includes a row of eight holes along its bottom edge, into which a header can be soldered so that the keypad can easily be connected to a breadboard, stripboard, or ribbon cable assembly If you have a keypad that accepts a header along its top edge, it will work fine for the breadboard experiments, but our stripboard project would need to be redesigned to work with such a keypad Finally, there seems to be a fair amount of variation in the specific order of the connecting points on different matrix keypads The simplest arrangement for the user would naturally be to have the row and column connections in order However, probably because the keypad layout is simpler and therefore less expensive, the connections are frequently not in any logical order If you use a keypad that has its connection points in an order that differs from the
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PICAXE Microcontroller Projects for the Evil Genius
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one I m using, you will need to modify both the breadboard and stripboard layouts The schematics, of course, will remain the same
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intersection of the currently active row and column has been pressed The second decoding method uses a resistor matrix to produce an analog voltage level that differs for each possible keypress The analog voltage is connected to an ADC input, and the processor simply converts the resulting voltage level back to the corresponding keypress This is the approach that we will use in our experiments and project in this chapter, for two reasons First, it enables us to use an 08M2 as the keypad s peripheral processor because all we need is one ADC pin More importantly, it frees the master processor from needing to repetitively take ADC readings to be sure it doesn t miss a single keypress whenever it happens This feature enables our intelligent keypad peripheral to function effectively with any M2-class processor However, the X2 processors implement two advanced features hardware interrupts and hardware
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