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Issue #202 May 2007 — Measurement & Sensors
Task Manager
Maximium Exposure, by C.J.
Abate
Priority Interrupt
Keeping the Lights On,
by Steve Ciarcia
New Product News, edited by John Gorsky
FEATURE ARTICLES
Proton Precession Magnetometer
by James Koehler
Instead of purchasing an expensive precession magnetometer, you can easily
build a basic system for a fraction of the cost using a Keil MCB2130 board
and an NXP LPC2138 microcontroller. James explains how. p. 14
Keywords: Magnetometer, MCB2130, LPC2138, PPM, liquid, RS-232, phase-slip, torodial coil, LM394
(A link to the article will be emailed to you.)
Circuit Board Plotting
by Curt Carpenter
Circuit Board Plotting 101. Curt describes how to draw PCB traces onto
copper-clad with a Hewlett-Packard 7440A ColorPro pen plotter and a Sharpie
Ultra Fine Point permanent marker. p. 24
Keywords: Circuit Board, PCB, plotter, HP 7440A, Windows, pen, CAD, HPGL, Sharpie, TurboCAD
(A link to the article will be emailed to you.)
Temperature Calibration System
by Brian Millier
Brian designed a portable temperature meter that contains a PID controller and a user interface for entering a setpoint. The meter can be plugged into a separate calibrator unit, which generates stable temperatures for sensor calibration purposes. p. 32
Keywords: Temperature, PID, calibrator, RTD, MCP3551, ADT70, ATmega88, Peltier, relay, thermistor, thermocouple, Steinhart-Hart
(A link to the article will be emailed to you.)
Embedded USB Host
by Lane Hauck
You don’t need an overpowered computer to communicate with just one USB
device. With a little bit of code and the right host controllers, Lane
designed his own embedded USB system. p. 43
Keywords: USB, host, memory, UMD, enumeration, MCB2130, MAX3421E, MAX4793, transfer, power
(A link to the article will be emailed to you.)
The Witness Camera — Read
it now!
Build a Self-Recording Surveillance
Camera
by Alberto Ricci Bitti
If burglars try to break into Alberto’s house, all of their movements
will be recorded by his self-recording camera system. This is no ordinary
alarm detector. The well-designed system silently starts recording when
it senses movement. p. 48
Keywords: Surveillance camera, ATmega32, PIR sensor, flash memory, AVR-DOS file system, thermopile, BASCOM, speech, IR
Energy and Load Analyzer
by Ronaldo Duarte
Ronaldo’s cost-effective, M16C/62P-based data logger can measure RMS voltage,
current, power, harmonics, and frequency. The handy system is perfect
for analyzing electrical values over time. p. 58
Keywords: Data logger, energy, load, M16C/62P, RMS voltage, current, power, harmonics, frequency, CS5460A, LCD, scope, FFT
(A link to the article will be emailed to you.)
COLUMNS
LESSONS FROM THE TRENCHES
More "Hello World": C
Program Flow
by George Martin
George recently introduced you to the C programming language. He also
showed you how to build a project using IAR Systems’s Embedded Workbench.
This month he takes a few steps back to explain the C program flow in
more detail. p. 67
Keywords: C, Embedded Workbench, procedures, pointer, array
(A link to the article will be emailed to you.)
FROM THE BENCH
What's the Slope?: Use an Accelerometer to
Measure Slope
by Jeff Bachiochi
With the help of Analog Devices’s ADXL103 MEMS accelerometer, Jeff can
measure the slope of an object by calculating its relationship to horizontal.
Read on to learn how. p. 72
Keywords: Slope, accelerometer, ADXL103, MEMS, angle, rise, run, PIC16F687, display
(A link to the article will be emailed to you.)
SILICON UPDATE
Be All You Can Bee
by Tom Cantrell
The arrival of Microchip’s IEEE 802.15.4-compatible MRF24J40 radio chip
encouraged Tom to examine the state of wireless protocols. In this article,
he covers the ZigBee embedded wireless initiative and Microchip’s MiWi.
p. 78
Keywords: IEEE 802.15.4, MRF24J40, MiWi, ZigBee, wireless, PICDEM-Z, ZENA
(A link to the article will be emailed to you.)
PREVIEW
Issue #203 June 2007 — Communications
◊ Communication
Protocols
◊ LIN-Based
Ultrasound Parking System
◊ Video-Based
Motion Sensor
◊ Power Supply
Design: A PID-Based SMPS
◊ USB-Controlled
Pulse Generator
◊ Slave Flash
Trigger
◊ Dew Point
Monitor
◊ Network
of Keypads
◊ABOVE
THE GROUND PLANE Practical Photomicrography
◊ FROM THE BENCH
Gearing Up to Go the Distance: Slotted Optical Switches
◊ SILICON UPDATE
Rock 'Em Clock 'Em
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