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Features

Build a Wi-Fi Sprinkler System — Part 2 By Bob Colwell
Now that you know how the Rabbit RCM5450W module works and how to interface relays and an LCD, it's time to set up your sprinkler system.

Build a Wall Wart Power Monitor By David Goodsell
This self-contained, battery-powered unit measures both DC current and voltage. It accepts four of the most common wall wart plugs and also has fouridentical output plugs — ready to hook to your project.

Introducing the 32-bit Micro Experimenter By Thomas Kibalo
It's here! We're graduating from our 16-bit Experimenter so we can experience a whole new level of applications with the 32-bit version.

Projects

Arduino Channel Surfer & Other Diabolical Gadgets By Andy Sullivan
With an understanding of IR codes, a wide range of devices can be built that offer new remote control capabilities.

Columns

TechKnowledgey 2011
Events, Advances, and News
Read about a device that gets its juice from heat and light, a better battery management system, a major upgrade for speakerphones, disposable e-books, plus some other stuff you'll find fascinating.

PICAXE Primer
Sharpening Your Tools of Creativity
Experimenting With Touch-Sensitive Keypads.

Q & A
Reader Questions Answered Here
This month's questions revisit the CAT 5 cable tester and cover a 400 Hz gyro drive, analog isolation techniques, and an LED chaser circuit, just to name a few.

Smiley's Workshop
Programming • Hardware • Projects
avrtoolbox — Open Source and Version Control.

Open Communication
The Latest in Networking and Wireless Technologies
New Versions of the 555Timer IC.

FUNdamentals For Beginners
Just getting started in eiectronics? Try these simple demos to illustrate electronics principles and how components function in actual circuits!