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#167 June 2004

Measurement & Sensors

Table of Contents


Task Manager
Tips and Solutions, by Jennifer Huber

Priority Interrupt
To TiVo or Not TiVo, by Steve Ciarcia

New Product News, edited by John Gorsky

—Feature Article —
Wireless Monitoring System
Flash Innovation 2003 Design Contest Winner

Read it now!

by Alberto Ricci Bitti
Alberto’s MC68HC908-based wireless monitoring system is adaptable for use in domestic and industrial settings. The central monitoring station, which consists of a computer-controlled receiver with a relay output and LCD, logs and displays data from up to 20 different sensors. Read on to learn how to build, program, and test your own system. p. 10

Keywords: Wireless, mouse trap, MC68HC908, LCD, relay, RF, sensor, low power

Turbocharged Upgrade
Crank Trigger Modification Eliminate Engine Knocking
Pete Rizun & William Hue
If you push a car with an aftermarket turbocharger too hard, its engine will knock. You don’t need to be a trained mechanic to know that this puts stress on an engine. As a solution, Pete and William put a PIC16F73 and an MPX4250AP pressure sensor to work in a device that eliminates engine knocking without draining too much horsepower in the process. p. 20

Keywords: Engine, knock turbocharger, PIC16F73, MPX4520AP, pressure, timing, ignition, interference

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Monopole Antenna Design
B.Thurow, J. Jorgenson, D. Kakumanu, B. Morlock, & M. Schmitz
Having trouble selecting an antenna for your new wireless system? Check out how this North Dakota State University design team used a guitar string antenna in a wireless sensor project. It’s a great alternative to the expensive whip and surface-mount antennas that you’re used to. p. 28

Keywords: Antenna, wireless, monopole, performance, impedance matching, LC, EZNEC, DR3000, MSP430

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Renesas H8 Design 2003 Contest Winners Announcement
p. 32

Keywords: Renesas H8 Design 2003 Contest, winners

Simple Bluetooth Integration (Part 2)
Interfaces and ECI Protocol
Anders Rosvall
Last month Anders explained how the ROK104001 and cB-OEMSPA13i make Bluetooth integration a cinch. Now he covers the interfaces and ECI protocol. Bluetooth integration is in your future. p. 36

Keywords: Bluetooth, ECI, ROK104001, cB-OEMSPA13i, microcontroller, AT command, ATmega128, LPC2106, GCC

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ZRT Real-Time Operating System
Gareth Scott
Gareth’s small preemptive multitasking operating system runs on Zilog’s Z8 microcontroller. The system—which consists of lightweight threads, a round-robin scheduler, and a binary semaphore—has the ability to voluntarily relinquish control back to the scheduler. Get ready to incorporate multitasking in your next project. p. 44

Keywords: RTOS, Z8 Encore!, ZRT, stack, threads, scheduler

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MCU Evolution
New Microcontrollers Meet Increasing Demand
Scott Pape
Survival of the fittest? You bet. Scott describes two areas in which MCUs are evolving to meet the demand for cutting-edge apps: reduced power consumption and clock system flexibility. p. 48

Keywords: MCU, evolution, power consumption, clock system flexibility, MC9S08

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ABOVE GROUND THE PLANE
Robot Mechanics
Ed Nisley
Writing a program for a robot requires an understanding of both physics and standard programming techniques. This column contains all of the basic information—essential formulas included—every serious robot designer should know. p. 56

Keywords: Robotics, mechanics, kinematics, mass, force, friction, energy, power, momentum

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APPLIED PCs
Adaptable Temperature Measurement System
Fred Eady
Fred recently designed a PIC18F452-based temperature measurement system for a small holding tank. Toss in a pair of Promi-SD202 Bluetooth modules, and you have wireless control. p. 60

Keywords: Temperature, PIC18F452, thermocouple, RTD, ADT70, Promi-SD202, 650P6B204 PRTD

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FROM THE BENCH
Smart Sensors Design
Jeff Bachiochi
Designing smart sensors can be tricky. Back in the mid-1990s, members of the transducer community believed that the IEEE 1451 standard would make things easier. Has it? Take note of Jeff’s opinion before starting your next smart sensor design. p. 68

Keywords: Smart sensor, IEEE 1451, transducer, TEDS

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Designing with the Nios (Part1)
Second-Order, Closed-Loop Servo Control
George Martin
Is the Nios the next major development in embedded system design? George is sold on its applicability; so much so, he used it to design a second-order, closed-loop servo control. p. 72

Keywords: Nios, peripherals, FPGA, servo, Quartus

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SILICON UPDATE
Radio Riot
Tom Cantrell
Wireless this and wireless that. With all the new products and standards floating in a sea of marketing hype, it’s hard to know what will best fit your design needs. Fortunately, Tom’s got the scoop on the most appropriate wireless solutions available to you, the designer. p. 78

Keywords: Wireless, ZigBee, Bluetooth, IEEE 802.15.4, spread spectrum, CC2420, RFID, WirelessUSB, EPC, Z-Wave

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Test Your EQ

Index of Advertisers

PREVIEW June #168
Graphics & Video
Full-Field Color Video Frame Grabber
Waveform Capture and Display:
Three Controllers Make a Waveform Monitor
Graphics LCD Library for the Z8 Encore!
Adaptable Multimedia Thermometer
Designing with the Nios (Part 2): System Enchancement
Easy Reflow: Build an SMT Reflow Oven Controller
Smart-E-Touch: An Intelligent User Interface

APPLIED PCs Uncomplicated dsPIC Implementation
FROM THE BENCH Lose the Crystal: Linear's LTC6903/4 Programmagble
SILICON UPDATE Motoring (Part 1): Motor Basics