Circuit Cellar Ink 238
May 2010

Table of Contents

4 CJ Abate	HTML Task Manager The Future Is Now
8 John Gorsky	HTML New Product News EFM32 "Tiny Gecko" (TG) microcontrollers from Energy Micro AS IRS-B210ST01-RI pyroelectric infrared (PIR) sensor from Murata Electronics North America MSP430 Value Line 16-bit MCUs from Texas Instruments, Inc. uIceBlue2 and BTswitch embedded Bluetooth modules from emxys Ltd. MK67Q5250 fingerprint-matching module from OKI Semiconductor STM32 Value Line ultra-low-cost, 32-bit microcontrollers from STMicroelectronics
13 David Tweed	HTML Test Your EQ
14 TJ Bordelon	The FreeSpace IMU A Quaternion-Based Algorithm for Attitude Estimation An unmanned robotic vehicle requires a working inertial measurement unit (IMU), which outputs an estimation of the attitude, or orientation, of a vehicle in 3-D space. For attitude estimation, you need MEMS sensors (e.g., gyros, accelerometers, and magnetometers) and a sufficient algorithm to "fuse" them together. This article covers a simple quaternion-based algorithm for an IMU project. Download: Bordelon-238.zip
Intelligent Energy Solutions 26 Stefan Siegel	Home Automation for an Energy-Efficient House Part 1: System Design and Server Software A 21st-century energy-efficient house requires more than extra insulation and a solar panel kit. A home control system based on some serious embedded hardware is essential. This series details how to build a home automation system based on a CAN bus running a CANOpen software stack. Here you learn about the overall design and server software. Download: Siegel-238.zip
36 Alexander Popov Peter Popov	Portable Network Service Monitor This portable network service monitor was developed to help network administrators supervise datacenters. The handy monitor is equipped with a 4 x 20 LCD that can display important messages from any configured server in a local network. It also continuously checks connectivity to predefined services on different machines. When problems occur, it triggers an alarm. Download: Popov-238.zip
44 Chris Paiano	OAE Probe Amp and Intercom Part 1: System Planning and Design This series covers the design of an otoacoustic emission (OAE) probe amp and touch-to-talk intercom system. The design is used for professional otoacoustic studies in a laboratory setting. Here you learn about the study of otoacoustics and how to perform hearing experiments with a standard PC. Download: Paiano-238.zip
Lessons from the Trenches 54 George Martin	Put C Language to the Test Part 2: Program Specifics In the first part of this series, you learned about an interesting project for implementing C language: a program for solving 2 x 2, 3 x 3, and 4 x 4 Sudoku puzzles. Now that you have a starting point (C language) and an ending point (a program), it's time to focus on the programming details.
From the Bench 60 Jeff Bachiochi	Machine Control Customize and Implement MCU-Based Control Circuitry You can use your design skills to control virtually any machine. Doing so is just a matter of proper preparation and planning. This article details the process of building an MCU-based tread speed control system. Try these design techniques in your own project.
Silicon Update 66 Tom Cantrell	IC Therefore IR You don't have to look farther than your favorite gadget to realize that "touch sensing" is all the rage. Whether it's a cell phone, MP3 player, or even a touchscreen PC, it's easier than ever to let your fingers to do the walking. But now Silicon Laboratories has come up with some clever chips that let your design get up close and personal.
74	Crossword Puzzle
78	Crossword Puzzle - Answers for Issue 237
79	Advertiser's Index / June Preview
80 Steve Ciarcia	HTML Priority Interrupt Electronic Alzheimer's

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