Cover - 238.qxp
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CIRCUIT CELLAR
DIY Home Automation, p. 26 • Build a Network Service Monitor, p. 36 • Custom MCU-Based Machine Control, p. 60
THE
MAGAZINE
FOR
COMPUTER
A P P L I C AT I O N S #238 May 2010
MEASUREMENT & SENSORS Inertial Measurement Unit Design Infrared Tech & Next-Generation Sensing Applications An OAE Probe Amp/Intercom System C Language Tutorial: Phase 2
$5.95 U.S. ($6.95 Canada)
www.circuitcellar.com
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SSH Encrypted SERIAL TO ETHERNET SOLUTIONS Instantly network-enable any serial device Works out of the box no programming is required
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SB700EX
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T
ASK MANAGER The Future Is Now
May 2010 – Issue 238
E
4
very issue of Circuit Cellar is special. But this issue strikes me as particularly extraordinary. Why? Here we present articles about some of the most innovative, talked-about, 21st-century technologies. These are concepts that your EE forefathers couldn’t have imagined—and even if a few of them did dream of something similar to such technologies, they likely treated the ideas as more fiction than fact. Which technologies am I talking about? An inertial measurement unit (think: unmanned aircraft), a home automation system for an energy-efficient home (think: home control), portable monitoring devices (think: realtime server maintenance), and custom machine control circuits (think: programmed system operation) are examples. If you take nothing else from this issue (which is doubtful), remember this: the future is now. Technology is so advanced that you can make most far-out ideas a reality. The key is being able to quickly gather quality information about cutting-edge technology so you can start working on the designs that were things of fiction only a few years ago. We’re here to help. Start with TJ Bordelon’s article titled “The FreeSpace IMU“ (p. 14). You learn not only about inertial measurement units, but also about a quaternion-based