Circuit Cellar Ink 189
April 2006

Table of Contents


Jennifer Huber

HTML Task Manager

Guaranteeing Dependability


John Gorsky

New Product News

  • iDwaRF-168 networkable radio transceiver module from
  • GRF1 Series of board-to-board connectors from Samtec, Inc.
  • Wi.232DTS-FCC spread-spectrum transceiver module from Radiotronix, Inc.
  • WN-102 and IGS-100 plug-and-play wireless sensor system from Newtrax Technologies, Inc.


Ken Merk

Monitor and Control With Text Messaging

Ken remotely monitors and controls mobile equipment with his cell phone. Essential information and commands move back and forth between his phone and the equipment in the form of text messages. Text messages make the system convenient and easy to use.



Scott Armitage

Low-Cost 2.4-GHz Spectrum Analyzer

Forget dropping big bucks on a microwave spectrum analyzer. You can build your own for a fraction of the cost. Scott walks you through the process of building an ATmega48-based 2.4-GHz spectrum analyzer.



Jean Paul Talledo Vilela

Data Acquisition for Mobile Applications

Jean Paul's wireless sensor network and position-tracking system is used to monitor a vehicle's acceleration, temperature, and more. After data is accumulated, it's sent to an Internet database server.



Alton Harkcom

Solution to Stand-Alone ISP Programming

Low-Cost STK500-Based Project

Alton has been using the Atmel STK500 development board for several years now. In this article, he explains his solution to stand-alone ISP programming. If all you need is an ISP programmer, this project fits the bill.



Stuart Brorson

Optical Proximity Sensor for Robots

Part 2: Open-Source PCB Layout Editor

Last month Stuart piqued your interest in his PCB-based optical proximity sensor. Now he explains how to lay out the proximity sensor using the gEDA suite's layout program. You're only a step away from being able to design PCBs with the open-source gEDA suite!



David Kanceruk

Wireless Sump Pump Monitoring System

Do you worry about your basement flooding? David's three-unit wireless system can monitor the water level in your sump pit. The system will sound an alarm and send you an e-mail if the water level gets too high.



Richard Hoptroff

Stock Clock

Wireless Network Delivers Market Data

Using the basic idea behind a wireless weather station, Richard built an Internet-enabled, stock monitoring system. But don't worry if monitoring the stock market isn't your thing. You can use this easy-to-build ZigBee-based system to pull virtually any other kind of textual information off the 'Net and display it on your dial.


Applied PCs


Fred Eady

Get Started in Mechatronics

Mechatronics is an exciting branch of engineering that involves the combination of mechanics, electronics, and computing. Fred shows you how to move a mechanical application into mechatronics territory with Microchip's PICDEM mechatronics demo board package.

Above the Ground Plane


Ed Nisley

RF Mixer Isolation and Coax Stub Filters

When Ed started receiving mysterious radio transmissions last summer, he set out find the source. This month he shares his findings, provides a useful review of how RF mixers work, and describes a notch filter made of coaxial cable.

Silicon Update


Tom Cantrell

Rock 'Em and SoC 'Em

FPGA manufacturers have claimed to offer an SoC for the masses. Until now, however, that's been more hype than reality, Tom says. Now we're getting closer to a true single-chip SoC solution. Enter Actel's Fusion FPGA.

From the Bench


Jeff Bachiochi

Automating Sudoku

After working through his first Sudoku puzzle by hand, Jeff was ready for another challenge. He automated the process with Liberty BASIC so he can solve Sudoku puzzles on a PC.



Crossword Puzzle


Advertiser's Index / May Preview


Steve Ciarcia

HTML Priority Interrupt

It's an E-mail World

FTP Directory for INK 189
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