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Table of Contents
Task
Manager
Become
a Better Embedded Programmer,
by Jennifer Huber
Priority
Interrupt
50
Years of Invention,
by Steve Ciarcia
New
Product News,
edited by John Gorsky
Multifunctional
Home Control System
Jack
Benjamin & Michael Benjamin
Do
you really want to take on a project like building
a home control system? Jack and Michal thought it
was worth it to get a customized system that works
with their lifestyle. It controls their alarms,
shades, utilities, and more. Wait until you learn
about what they’re planning next. p.14
Keywords:
Home control, direct wire, I/O, ENDAT-3201MH, PCI-1753,
PCI-1753E, buffer, relay, optocoupler, keypad, LCD,
Windows, XML, scheduler, alarm
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here for a password.)
APPLIED
PCs
Discover True 16-Bit Functionality
Explorer 16 Offers Welcome Flexibility
Fred
Eady
With
Microchip Technology’s Explorer 16 development board,
you now have true 16-bit mode functionality. Fred
takes you inside. The inexpensive board features
the new PIC24FJ128GA010 microcontroller and dsPIC33F128GP710
digital signal controller PIMs. p. 22
Keywords:
Explorer 16 development board, PIC24FJ128GA010,
dsPIC33F128GP710, 16 bit, memory, program space
visiblility, C compiler
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ABOVE
THE GROUND PLANE
Sampled Data Bandwidth
Filtering
Ed
Nisley
In
his last article, Ed described the horrors of an
unfiltered system. This month he examines what happens
with both good and bad filters. p. 28
Keywords:
Sampling, data, bandwidth, filtering, sample-and-hold,
harmonics, Nyquist, Butterworth, antialiasing, images,
oversampling
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FROM
THE BENCH
Power Over Ethernet Primer
Jeff Bachiochi
Sick of dealing with wall warts? Try power over
Ethernet (PoE). Many devices (e.g., security cameras)
are now PoE-compatible. Jeff shows you how to establish
PoE on an Ethernet link between a hub and an endpoint
device. p. 34
Keywords:
Power over Ethernet, PoE, Cat 5, wiring,
power management, TPS2384, PD, PSE, TPS2375
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here for a password.)
SILICON
UPDATE
Something Old, Something New — PDF
available
Tom Cantrell
Naysayers are eulogizing the dearly beloved 8-bit
microcontroller. Once again, Tom says not so fast.
A new generation of chips proves there’s still a
long life ahead for the 8-bit MCU. p. 40
Keywords:
8-bit microcontrollers, PIC24, dsPIC,
MC9S08QG, C8051F316/F317, SSP1492, mixed signal,
CC2430, ZigBee, IEEE 802.15.4, motor control, Z8
Encore! MC, MSP430F20xx, H8, PSoC, AVR
—Feature
Article —
Robust
Bootloader for FPGAs
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Read
it now!
by Colin
O'Flynn
Colin built his LoonBoard Unified Bootloader
(LUB) to program Xilinx FPGAs. The LUB, which
takes only 207 words of program memory, can
self-calibrate its internal RC oscillator.
p. 44
Keywords:
Bootloader, LoonBoard,
LUB, ATmega88, Xilinx FPGA, AT45DB041B, memory,
DataFlash, communications, self-calibration,
AVR-GCC, X1226
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Embedded
Object-Oriented Programming
Chris
Cantrell
To
be an effective software engineer, you must have
the right tools on hand for generating top-notch
code. Object-oriented programming is one such tool.
Chris explains how to use object-oriented programming
to take your embedded designs to the next level.
p. 52
Keywords:
Object-Oriented Programming, OOP, classes, C++,
inheritance, encapsulation, polymorphism, memory
management, Xport robot controller, Game Boy
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Rooting
Around
Integer Square Roots on Small Processors
Michael
Dvorsky
There
are numerous ways to compute square roots. Have
you ever tried the sum-of-odds method? What about
the bisection method? Michael goes over the basics
and shows you how to choose algorithms to suit your
particular applications. p. 60
Keywords:
Square
root, algorithm, Newton-Raphson method, sum-of-odds,
bisection, RMS, AVR GCC, ATmega8, AT90S8515
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Output
Real Numbers
Mariano
Barron
When
Mariano first started developing his talking calculator,
he used the scanf and printf functions to enter
numbers from the keyboard and show the results on
the display. But he soon discovered that using the
printf function to output real numbers was soaking
up a lot of code memory. Implementing the float-to-ASCII
(ftoa) function solved the problem. p. 67
Keywords:
C, I/O functions, ftoa, float-to-ASCII,
floating point, IEEE 754, AVR, 8051
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here for a password.)
Number
Crunching on a Budget
Custom PIC MCU Solution Trumps PC
Tom
Napier
Your
expensive desktop PC isn’t always the best solution
for all of your number crunching problems. As Tom
explains, some computations can be done more economically
on a $4 custom programmed PIC microcontroller than
on a PC. p. 73
Keywords:
Number crunching, PIC, PC, noise generation, bit
shifting, memory, speed, power, loops, Gaussian,
filter
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here for a password.)
Voice
Changer Technology
Aviad
Bechori, Shlomo Engelberg, & Roi Rapoport
Shlomo,
Aviad, and Roi built a voice changer for a research
project they undertook for an Israeli police unit.
Here they explain everything they learned along
the way. p. 76
Keywords:
Voice changer, linear predictive coding, single
sideband suppressed carrier, modulation, pitch,
Simulink, demodulator, MATLAB, FDATool block, modeling,
FIR, ADSP-21065, Visual DSP++
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here for a password.)
DTMF
Decoder
Chris
Coulston, Brian Nypaver, & Jeffrey Rimko
Using some serious math and timing-saving design
techniques, you can build a PIC18F452 microcontroller-based
device that decodes the tones generated by a telephone
keypad. Chris, Brian, and Jeffrey describe a system
that can decode a touch-tone in 1 s.
p. 80
Keywords:
DTMF, PIC18F452, CH1840, POTS, Fourier, FFT, Goertzel
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Crossword
Index of Advertisers
PREVIEW
March#188
Robotics
Robot
Localization and Control
Outdoor
Mobile Robot
Optical Proximity Sensor for Robots (Part
1): Simple PCB Design with the gEDA Suite
Image Processing for Robots
Servo
Animation Controller
Low-Cost Serial Servo Controller
Digital Compassing: Build a Tilt-Compensated
Digital Magnetic Compass
Concurrent Small C for PIC18 MCUs
APPLIED PCs
Remedy for USB-to-MCU Pain: Embedded USB with
HIDmaker FS
FROM THE BENCH
Simple Robotics Experimentation
SILICON UPDATE
FIR Factor
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