barcode scanner vb.net textbox I Pin 24. This is the unregulated power input. Apply an unregulated DC voltage of 5.5 to in Software

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I Pin 24. This is the unregulated power input. Apply an unregulated DC voltage of 5.5 to
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15 volts here. The onboard regulator will provide a stable 5 vdc input for the BX-24 circuitry. I Pin 23, 4. This is the ground. You can use either or both of these pins when connecting to other circuitry. I Pin 21. This is for 5 vdc input. Instead of using pin 24 for power, you may directly apply regulated 5 vdc to this pin. Or, if power is applied through pin 24, pin 21 serves as a convenient source of regulated 5 vdc power. The voltage regulator on the BX-24
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504 USING THE BASICX MICROCONTROLLER
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can supply approximately 70 mA of total additional current, either through this pin or through the I/O pins described next. Pins 5 through 11. This is I/O Port C, one of two eight-bit ports on the BX-24. Pin 12 serves double duty as an input capture pin, which can be used for very accurate timing. Pin 11 serves double duty as an external interrupt. With the appropriate programming, the BX-24 can be commanded to automatically run certain code when this line goes HIGH. Pins 13 through 20. This is Port D, the second of two eight-bit ports on the BX-24. All of the pins in this port serve double duty as analog-to-digital conversion inputs. That is, in addition to on/off (1 and 0) digital inputs and outputs, these pins can accept analog inputs. The range of the analog inputs spans 0 to 5 volts. Pins 25 and 26 are additional I/O lines that are available if you solder connections directly to the BX-24 chip (as such as they are not strictly pins, but we ll treat them as if they were). Access to pins 25 and 26 are provided via plated-through holes, which can be connected to wires or pin headers. These two pins share I/O with the on-board red and green LEDs. Pin 27 serves as the output capture I/O line. As with pins 25 and pin 26, this pin is available if you solder directly to the BX-24 chip.
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Programming the BX-24
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To program the BX-24 you need to purchase the BasicX-24 developer s kit, which contains one BX-24, a programming cable, a power supply, a carrier board (see Fig. 32.3), and programming software on CD-ROM. You plug the BX-24 into the carrier board, which has a 24-pin socket and empty solder pads that you can use to add your own circuitry. The programming cable connects between the carrier board and a serial port on your PC. The power supply is the wall wart variety and provides about 12 16 vdc. The BX-24 uses a proprietary programming environment, consisting of an editor and a download console, which also serves double duty as a terminal for data sent from the
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FIGURE 32.2 Pinout diagram of the BasicX-24 chip. Note that several of the pins serve double duty (as explained in the text).
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PROGRAMMING THE BX-24 505
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FIGURE 32.3 The easiest way to experiment with the BX-24 is to use the carrier board that is included as part of the BX-24 developer s kit. The carrier board includes a DB-9 connector for hooking the system up to a PC for programming.
microcontroller. The program editor, shown in Fig. 32.4, supports the BasicX language, which is a subset of Microsoft Visual Basic. Don t expect all Visual Basic commands to be available in BasicX, however. BasicX supports the same general syntax as Visual Basic, and many of the same data types (bytes, integers, strings, and so forth). If you re familiar with Visual Basic then you should feel right at home with BasicX. The BasicX language supports the usual control structures, such as If End If, While Wend, For Next, and Select Case. Your BasicX programs can be subroutines, and you can call those subroutines from anywhere in the program. Depending on how you ve used Visual Basic, however, you may discover that BasicX is far less forgiving of certain programming habits. BasicX uses a strict data-typing syntax that requires you to use the Dim statement or one of its variations, such as Const to define each variable before it is used. With the Dim statement you must also indicate the variable type, such as Byte or String. Modern versions of Visual Basic support a special type of variable called the variant. Variants can hold most any kind of data, which allows you to freely mix and match data types, such as adding an integer to a string (i.e., adding the number one to the name
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