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Table of Contents
Task
Manager
VoIP
in the Limelight,
by Jennifer Huber
Priority
Interrupt
A
Simple Wiring Job,
by Steve Ciarcia
New
Product News,
edited by John Gorsky
Speech
Waveform Encoder
Mariano
Barron
Mariano’s
speech waveform encoder makes reproducing audio
content extraordinarily simple. Only one or two
microcontroller pins are required. Read on to learn
how to build and program your own AT89C4051-based
encoder. p.16
Keywords:
Speech, waveform, encoder, AT89C4051, RC, PCM, compression,
WAV
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here for a password.)
Connect
with eZ80F91-Based VoIP
Huifang
Ni, Jinxi Zhang, Yang Zhang
Voice
over Internet Protocol (VoIP) technology enables
you to transmit phone calls as digital voice data
over the Internet by way of packet-linked routes.
In this VoIP system, a voice band pulse-coded modulation
(PCM) codec is connected to an eZ80F91 MCU through
serial peripheral and I2C interfaces.
Connecting audio devices to the system is easy.
p. 28
Keywords:
VoIP, eZ80F91, PCM, telephone, Internet,
XINU, TLV320AIC22C
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here for a password.)
eZ80-Based
Wireless Network System
Lionel
Theunissen
You
can monitor several machines contemporaneously with
Lionel’s wireless network system. With its simple
design and easy-to-use, ’Net-enabled interface,
the versatile system is well suited for a variety
of projects ranging from alarm control to home automation.
p. 38
Keywords:
eZ80Acclaim!, eZ8F6401, wireless, HTTP
server, TRX433 transceiver, protocol frame, polling
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FROM
THE BENCH
A Fresh Look at VoIP
Jeff Bachiochi
If your eyes light up when someone mentions Voice
over Internet Protocol (VoIP), this column’s for
you. Read on for a fresh look at this exciting new
technology. p. 46
Keywords:
VoIP, Internet, softphone, hardphone,
codec, software, session management, SIP, RTP
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Bit
Flipping Tutorial
An
Uncomplicated Guide to Controlling MCU Functional
Eric
Weddington
Bit
flipping—the process of flipping bits in registers—enables
you to control a microcontroller’s functionality.
But what is the best method of bit flipping? Eric
points you in the right direction with this helpful
tutorial. p. 52
Keywords:
Programming, bit flipping, masking, logic, C,
HAL, hardware abstraction layer, API
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Add
USB to Anything
Lane
Hauck
Need
to make a USB peripheral? Now you can add USB to
any microprocessor with the new Maxim MAX3420E,
which operates as a full-speed USB peripheral. Lane
shows you how. He also describes the code he used
to create a Windows Panic button. p.59
Keywords:
USB, MAX3420E, SPI, power, programming, MAXQ2000
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here for a password.)
—Feature
Article —
Solar-Powered
Water Pump Controller
Cypress PSoC High Integration Challenge
2004 Contest Winner
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Read
it now!
by Lindsay
Meek
Lindsay’s CY8C27443-based Solar Pump Controller
operates a submersible water pump directly
from solar panels. It’s ideal for remote areas
that lack conventional power supplies. The
powerful PSoC provides three-phase PWM generation,
signal conditioning, temperature monitoring,
constant voltage-to-frequency control, and
over-current and fault protection. p. 64
Keywords:
Pump controller,
solar, C8C27443, PWM, signal conditioning,
temperture, voltage-to-frequency, data acquisition,
over-current
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PIC16F627-Based
Access Controller
Wiegand-to-RS-232 Converter
Charles
Bundy
Upgrade
your security system with a PIC16F627-based access
controller. Charles’s system monitors traffic through
a door and controls a magnetic door lock. An approved
RF identification card is required for entry. p.69
Keywords:
PIC16F627, Wiegand, RF, card, door, proximity device,
web server, MySQL
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here for a password.)
APPLIED
PCs
Put
ZigBee to Work
Fred
Eady
Understanding
ZigBee technology is one thing. Putting it to work
is another. Fortunately, Fred has the hands-on experience
to get a wireless embedded application up and running.
This month he straightens the ZigBee learning curve
with Microchip’s PICDEM Z demonstration kit. p.
74
Keywords:
ZigBee, PICDEM Z, stack, CC2420, PIC18LF4620
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SILICON
UPDATE
World Beyond Ware
Tom Cantrell
You can design an entire PSoC-based embedded system
without writing any code. Tom talks about experimenting
with the CY3210-ExpressDK board and programming
with PSoC Express. There’s more, and less, to programming
with pictures than meets the eye. p. 79
Keywords:
PSoC,
CY3210-ExpressDK, VHDL, UML, PSoC Express, design
software, GUI
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here for a password.)
Test
Your EQ
Index of Advertisers
PREVIEW
August #181
Embedded
Development
Flight
Computer for High-Power Rocketry
Real-Time
Pulse Generator
Build a Hardware Accelerator
Strong Encryption for PICs (Part 1):
Triple-DES Algorithm
Hardware
Synthesis with VHDL (Part 1): VHDL Implementation
PSoC Pulse Generator
ABOVETHE GROUNDPLANE
Analog
Tips and Tricks
APPLIED PCs Reach
for Interface Control:
Add a GUI to a ZF8042A-Based Design
FROM THE BENCH
Simulate
First: Simulation
Techniques to Test New MCUs
SILICON UPDATE
I Left My Chip in San Francisco
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