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ment platform, you write software for the microcontroller using a custom program editor. The software is then compiled to a series of tokens or bytecodes and then downloaded to the microcontroller. Joining the ranks of powerful embedded-language programmable microcontrollers is the BasicX-24, by NetMedia, a company founded by the creator of the popular LANtastic networking software (which sold some 10 million copies). The BasicX-24 is actually a member of a family of microcontrollers from NetMedia that also includes the less expensive (but network-capable) BasicX-01. However, all things considered, the BasicX-24 is perhaps the most versatile, so this chapter will focus on it exclusively.
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Inside the BasicX-24 Microcontroller
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A selling point of the BasicX-24 (which we ll refer to as the BX-24 from here on) is that it is pin-for-pin compatible with Parallax s Basic Stamp II. That is, the functions of all 24 pins of the BX-24 replicate the functions of the Basic Stamp II, including power and ground connections. It s important to note, however, that the BX-24 is not a Stamp clone. The two microcontrollers don t share the same programming languages, so programs written for one will not work on the other. Additionally, the BX-24 has several additional features not found in the Basic Stamp II, such as built-in analog-to-digital conversion and 32K of EEPROM memory. Fig. 32.1 shows the BX-24 chip, which (like the Basic Stamp) is actually several integrated circuits on a small circuit board. The layout of the pins on the BX-24 is identical to that of any standard-sized 24-pin IC, so it will plug into a regular 24-pin socket. Additional plated-through holes are provided on either end of the BX-24 board, making it just slightly longer than the Basic Stamp II. These holes provide connections to additional input/output lines provided on the BX-24. I ll get to those in a bit. The BX-24 directly supports 16 input/output (I/O) lines, the same number as the Basic Stamp II. For each I/O line, or pin, you can change the direction from an input or an output. When an I/O line is an output, you can individually control the value of the pin, either 0 (logic LOW) or 1 (logic HIGH). When an I/O line is an input, you can read a digital or analog value from a TTL-compatible device connected to the BX-24. Eight of the 16 I/O lines can be used for analog connections. The BX-24 incorporates its own built-in 10-bit analog-to-digital converter (ADC). Under software control, you can indicate which of the 8 input lines is to be read. Three of the plated-through holes of the BX-24 serve as optional I/O and are programmatically referred to as pins 25, 26, and 27. This makes a total of 19 input/output pins. The remaining plated-through holes provide a way to connect to the chip s serial peripheral interface, or SPI, lines. I do not recommend that you connect to these lines unless you re familiar with SPI interfaces, especially since the BX-24 s EEPROM is controlled by these same I/O lines. A nice feature of the BX-24 is its two LEDs: one red and one green. The green LED is normally used to indicate that the chip is powered on, but you can individually control both LEDs from your own programs. You might use the LEDs as status indicators, for example. The LEDs share two of the additional plated-through hole connectors on the BX-24.
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PINOUT DIAGRAM FOR THE BX-24 503
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FIGURE 32.1 The BasicX-24 consists of surface-mount integrated circuits on a small circuit board. The BX-24 circuit board has the same dimensions as a standard 24-pin IC.
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The BX-24 board comes with its own five-volt voltage regulator, which provides enough operating current for all the components on the board, plus several LEDs or logic ICs. If you plan on using the BX-24 to operate a robot, you ll want to provide a separate power supply of adequate current rating to the other components of the robot. You should not rely on the BX-24 s on-board regulator for this task.
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Pinout Diagram for the BX-24
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Fig. 32.2 shows the pinout diagram of the BX-24 as well as the functions of its 24 pins. Of main interest are the following:
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