T & L Publications, Inc :: Back Issues :: 2011

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. Page 36

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 four identical output plugs — ready to hook to your project. Page 42

Introducing the 32-bit Micro Experimenter
by Tom 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. Page 58

Projects

Arduino Channel Surfer & Other Diabolical Gadgets
Arduino
by Andy Sullivan
With an understanding of IR codes, a wide range of devices can be built that offer new remote control capabilities. Page 30

Columns

Techknowledgey
by Jeff Eckert
TechKnowledgey 2011
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. Page 10

PICAXE Primer
by Ron Hackett
PICAXE Primer
In this month’s installment of the Primer, we’re going to explore two different implementations of a touch-sensitive keypad. Page 14

Q&A
by Russell Kincaid
Q & A
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. Page 22

Smiley’s Workshop
by Joe Pardue
Smileys Workshop: An AVR C Programming Series (Part 31)
avrtoolbox — Open Source and Version Control. Page 50

Open Communication
by Louis E. Frenzel
Open Communication
New Versions of the 555 Timer IC. Page 64

Fundamentals For Beginners
How an NPN Transistor Works
In this experiment, we will build a simple circuit to observe an NPN transistor serving as a current amplifier. Page 72