barcode generator vb.net code Copyright 2003 by The McGraw-Hill Companies, Inc. Click Here for Terms of Use. in Software

Printer Code 128 Code Set B in Software Copyright 2003 by The McGraw-Hill Companies, Inc. Click Here for Terms of Use.

Copyright 2003 by The McGraw-Hill Companies, Inc. Click Here for Terms of Use.
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228 BALLOON TELEMETRY CONTROLLER
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This project centers around the use of a BASIC STAMP 2 microprocessor as the main component in this project, as illustrated in Fig. 17-1. The original BASIC STAMP 2 is used for this project, but the alternative STAMP 2 could easily be substituted if you wish to save some money. This project begins with a Motorola MPX5100A pressure sensor. The pressure sensor is a 6-lead, 5-V device, with a 0- to 14.5-psi range. The MPX5100A is a single-element thin-film piezoresistive transducer designed for microcontroller operation. The pressure transducer is connected to a calibration resistor/capacitor network shown at C1/R1. The output from the sensor is next coupled to a voltage divider network at Ra/Rb. The divider is a resistor-ratio network formed by a 100-k and a 10-k resistor. The output from the divider is then fed to the input of a Maxim MAX187 analog-to-digital converter. The MAX187 is an 8-pin single-channel converter ideally suited to microprocessor control. The STAMP 2 controls pins 7 and 8, respectively, the chip select (CS) and SCLK pins. The digital output of the A/D converter is shown at pin 6, and is fed to P1 of the BASIC STAMP 2. Two thermistor temperature sensors are connected to the STAMP 2 via pins P6 and P7, through capacitors C2 and C3. Three output ports are used in this project. Pin 3 on the STAMP 2 provides an audio output to the radio transmitter, through a coupling capacitor. The STAMP 2 pin P4 is used to control a relay, which provides contact closure for turning a transmitter or oscillator off and on. Pin P5 of the STAMP 2 is used to control an optional servomotor, which controls a mirror. The enhanced camera feature controls a mirror that is used to change camera angles, in order to allow the on-board camera to see different balloon or rocket aerial views. This alternative aspect of the project could utilize a small live mini TV camera, with a mini ATV transmitter to broadcast balloon pictures back to earth.
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The balloon telemetry controller project was constructed on a small printed circuit board with the STAMP 2, the A/D converter, the pressure sensor, and the 5-V regulator. Integrated circuit sockets for the STAMP 2 and A/D converter are highly recommended for this project. A socket helps to protect the STAMP 2 from excessive heat when soldering and also facilitates easy removal in the event of a system failure down the road. When building the balloon telemetry controller, be sure to observe the correct polarity while installing capacitors, diodes, and transistors. When installing the ICs, pay particular attention to the orientation of the pressure transducer and analog-to-digital converter chip. Taking time for these details will prevent unpleasant surprises on power-up. Note that power switch S1 does double duty both to apply power and to shut down the A/D converter chip. A momentary pushbutton is connected to ground at pin 22, which provides a system reset button in the event of the processor lockup. The STAMP 2 can be powered by a 9- to 12-Vdc power source. A rechargeable battery pack is recommended for this project. The 9- to 12-V supply is also fed to the regulator at U3, which provides 5 V to the pressure sensor and A/D converter. A system ground connection is applied to pin 23 of the
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J2 2
9 12Vdc P1 J1-1 S1
1 2 3 6 5 4
5V C1 5V R1 U1 RA 5V S1 RB
1 VDD 2 AIN 3 4 SCLK CS 8 7 6 6
SHOW DOUT REF GND
TX RX ATN GND P0 P1 P2 P3 P4 10 P5 11 P6 12 P7
1 2 3 4 5 6 7 8 9
U2 BS 2
VCC GND RST 5V P15 P14 P13 P12 P11 P10 P9 P8
24 23 22 21 20 19 18 17 16 15 14 13
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