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THE BASIC STAMP 2
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CONTENTS AT A GLANCE Advantages of STAMP 2 Approaches to Construction Alternative STAMP 2 An Exercise
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he BASIC STAMP 1 (BS1) was the first of the STAMP series, using a miniversion of BASIC or BASIC tokens in order to program the microcontroller. The BASIC STAMP 1C features a 256-byte EEPROM, or about 75 instructions, and runs at 4 Mhz, performing 2000 instructions per second. A revision of the STAMP 1 later became the STAMP 1 rev. D. The latest version of the BASIC STAMP 1 is the STAMP 1 module shown in Fig. 1-1. Figure 1-2 depicts the BASIC STAMP 1 schematic. The STAMP 1 is programmed via the parallel port of a personal computer. All of the projects in this book will use the BASIC STAMP 2 (BS2) microprocessor, which sports a 2048-byte EEPROM for about 500 instructions, and runs at 20 MHz, performing 4000 instructions per second. Table 1-1 shows some comparisons between the STAMP 1 and STAMP 2 input/output instructions. The STAMP 2 runs much faster, has a number of extra commands, such as FREQOUT, SHIFTIN, DTMFOUT, and XOUT, and will hold larger programs than the original STAMP 1. The BASIC STAMP 2 has become the de facto microprocessor for sensing and control applications, a model that a number of other companies have decided to follow. The STAMP 2 is a very versatile and popular microprocessor building block that can be used to develop many different electronic sensing and control systems (see Fig. 1-3).
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Copyright 2003 by The McGraw-Hill Companies, Inc. Click Here for Terms of Use. 1
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2 THE BASIC STAMP 2
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Figure 1-1 BASIC STAMP I module.
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1 CS VDD 2 CLK NC 3 D1 ORG 4 D0 VSS RA1 RA0 OSC1 OSC2 18 17 16 15 8 7 6 5 PCL (4) PCO (3) VSS (2)
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S-81350HG 1 0 U4
22 F +5V U1
1 RA2 2 RA3 3 RT CC 4 MCLR 5 VSS 6 RB0 7 RB1 8 RB2 9 RB3
VSS (2) +5 S-85054H-N 1 U3 0
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14 VDD 13 RB7 12 RB6 11 RB5 10 RB4
PIC 16C56
P1(8) P2(9) P3(10)
P4(11)
Figure 1-2 BASIC STAMP 1 schematic.
The BASIC STAMP 2 is available in two different types: dual inline package (DIP) or a small outline integrated circuit (SOIC) package. The BASIC STAMP 2 is a PIC16C57 chip with a PBASIC2 interpreter running at 20 MHz. The STAMP 2 has 16 pins for input/output applications and can talk directly to a serial port from a personal computer, for programming. Parallax, which sells the STAMP 2 products, offers the STAMP 2 in a 24-pin module, which is a self-contained STAMP 2 with onboard regulator and brownout protection. This STAMP 2 module is offered for $49. There are now many versions of the
P5(12) P6(13) P7(14)
P0(7)
ADVANTAGES OF STAMP 2 3
TABLE 1-1
BASIC STAMP I/O INSTRUCTIONS BASIC STAMP 2 (BS2)
BASIC STAMP 1 (BS1)
BUTTON HIGH LOW OUTPUT POT PULSIN PULSOUT PWM REVERSE SERIN SEROUT SOUND TOGGLE
BUTTON COUNT DTMFOUT FREQOUT HIGH LOW OUTPUT PULSIN PULSOUT PWM RCTIME REVERSE SERIN SEROUT SHIFTIN TOGGLE XOUT
STAMP 2: STAMP 2P, 2E, 2I, 2SX, and a STAMP 2 original equipment manufacturer (OEM) version, shown in Fig. 1-4 a true testament to a truly successful product. The BASIC STAMP 2 (BS2-IC) is the single most popular BASIC STAMP module and is widely used in educational, hobby, and industrial applications. This module normally has 2 kbytes of program space and 16 I/O pins. A serial PC interface provides enhanced debugging features.
Advantages of STAMP 2
The BASIC STAMP 2P (BS2P24, BS2P40) has several advantages over all previous BASIC STAMPs, including commands for interfacing with parallel LCDs, I2C devices, Dallas Semiconductor 1-Wire parts, and a polled interrupt capability. The BS2P is 3 times faster than the BS2-IC and 20 percent faster than the BS2SX-IC and is available in a pincompatible format to other BS2 variants, or as a 40-pin module (with 16 extra I/O pins!). The BASIC STAMP 2SX (BS2SX-IC), using the Ubicom SX microcontroller, is 2.5 times faster than the BS2-IC. It has the same program memory as a BS2P but does not have
4 THE BASIC STAMP 2
Figure 1-3 Electronic sensing and control systems that can be built with BASIC STAMP 2.
Figure 1-4 STAMP 2 OEM version.
APPROACHES TO CONSTRUCTION 5
commands that interface with the parts listed above. It is a great solution for those needing more power than a BS2-IC offers. The BASIC STAMP 2E (BS2E-IC), using the Ubicom SX microcontroller, runs at the same speed as BASIC STAMP 2, but has the RAM and EEPROM size benefits of the BS2SX, without the speed and power consumption. It is ideal for those who use the BS2 and would like more variable or program space. Most of the projects in this book will center around the BS2-IC, which was the first and most popular version of the STAMP 2. A schematic diagram of the original BASIC STAMP 2 (BS2-IC) is shown in Fig. 1-5. The original BASIC STAMP 2 contains the SOIC version of the PIC16C57 chip at U1, the external memory chip at U2, a reset chip at U3, and a voltage regulator at U4. Finally, Q1 through Q3 are used as serial port input conditioners. Figure 1-6 illustrates the serial port programming pinouts on the original BS2. The first four pins on the left of the BS2 carrier are the serial port connections. Pin 1 on the BS2 is the Sout or RX pin, which connects to pin 2 of an RS-232 DB-9 serial female connector. Pin 2 on the BS2 is the Sin or TX pin, connecting to pin 3 of the DB-9. Pin 3 on the BS2 is the ATN pin which connects to pin 4 of the DB-9, and finally pin 4 of the BS2 is the ground connection on pin 5 of the DB-9 connector. Note, that pins 6 and 7, or DSR and RTS pins, are tied together on the serial port connector. Table 1-2 illustrates a memory map of the BS2-IC. The memory map shows where program information is stored; it also clarifies how to access inputs and outputs of the STAMP 2. Table 1-3 depicts the STAMP 2 pinouts and this chart describes each of the pins and their respective functions.
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