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When constructing circuits using the BASIC STAMP 2, there are a number of different approaches you can take. One often-used approach to building and testing new microprocessor and electronic circuits is using the protoboard. The protoboard allows the beginner as well as the seasoned engineer or technician to test new circuits before he or she commits them to a special circuit board. The Parallax NX1000 protoboard is shown in Fig. 1-7. This advanced protoboard is a dream to use. It contains extra components to make new circuit testing go smoothly. The NX1000 protoboard sports serial ports, voltage regulator, LEDs, switches, extra input and output connections, and the like. Using this type of protoboard you can easily change wires and add new components quite simply on the fly. Another approach is to use a simple, no-frills protoboard. The simple protoboard consists of the inner white portion of the NX1000. Using this approach, you will need to supply all the extras yourself. This approach is somewhat cheaper but takes up more real estate on your bench top. Many hobbyists choose the STAMP 2 and a simple carrier board, depicted in Fig. 1-8, which allows building a circuit on the carrier board with the BS2 onboard. The simple BS2 carrier board incorporates a STAMP 2 socket, a 9-V battery terminal, and a serial connector, as well as single row of header jacks, to facilitate connecting between the STAMP 2 and other points on the board. Using this approach, you would solder other components to the board and run jumper wires between components. Many hobbyists add additional IC
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Figure 1-5 BASIC STAMP 2 schematic.
ALTERNATIVE STAMP 2 7
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Figure 1-6 Serial programming port.
sockets to the board. Another approach to using the carrier board concept is to use the supercarrier board, as illustrated in Fig. 1-9. The supercarrier board contains a number of more useful aides, such as power regulators, more header pins, serial connections, and reset switch. Additional IC sockets can be placed on the board for expansion, with jumper wires added between sockets. This approach is a bit more permanent than using the protoboard. Many people use the carrier board as their protoboard for simple circuits. Other hobbyists use the carrier board as a replacement for a printed circuit board.
Alternative STAMP 2
Another approach to obtaining the STAMP 2 is to build your own alternative BASIC STAMP 2. In this configuration you obtain the 28-pin DIP interpreter chip and a few extra support or glue components, and you can save about half the cost of the original STAMP 2 by assembling or rolling your own. The alternative STAMP 2 project revolves around the lower-cost BASIC STAMP 2 interpreter chip, a 16C57 PIC, a 28-pin DIP-style STAMP 2, rather than the stock BASIC STAMP 2 module. The lower-cost 28-pin PIC BASIC interpreter chip requires a few external support chips and occupies a bit more real estate, but the cost is significantly less. The BASIC STAMP 2 costs $49, while rolling you own will cost about half, or $21. The 28-pin BASIC STAMP 2 interpreter chip requires a few external support components, a 24LC6B memory chip, a MAX232 serial interface chip, and a ceramic resonator. The MAX232 requires four 1- F capacitors, a diode, and a resistor and provides a conventional serial I/O, which is used to program the microprocessor. The alternative STAMP 2 processor circuit is shown in Fig. 1-10. Both the STAMP 2 and the alternative STAMP 2 perform equally well for all of the projects in this book. Please note that the pinout arrangement is a bit different between the original BASIC STAMP 2 and the alternative STAMP 2 (see Table 1-4). Another alternative is to purchase the original equipment manufacturer (OEM) module kit from Parallax, which is quite similar to the alternative STAMP 2.
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