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Features

Making the DEFCON 16 Badge by Joe Grand
Joe highlights his design process and the problems he encountered during the creation of his most recent DEFCON badge.

Projects

Inductive Proximity Sensors by Beau Schwabe
A series resonant circuit built on a Propeller demo board is utilized in this build to detect the proximity of metallic objects.

Makin’ MIDI with mistraIXG: Part 2 by Steve Russell
This time, we look under the hood of last month's design to see how the mistaIXG hardware and software work together.

Wind Your Own Transformers and Build a DC-to-DC Converter by Jim Stewart
Use this board as a platform for your switch-mode projects and experiment with winding transformers.

Columns

Techknowledgey by Jeff Eckert
Techknowledgey 2009
Topics covered include a dual screen laptop, phone watch, motor sets RPM record, plus more.

Stamp Applications by Jon Williams
Creating Time-Lapse Video
In the video age, time-lapse movies are not easily produced with a video camera, but as my friend (and VFX wizard) John demonstrated, one can easily create a time-lapse movie with a digital still camera and video editing software.

Q&A by Russell Kincaid
Q & A
Measuring energy use, more on oscillators, flat panel TVs, plus more.

The Design Cycle by Fred Eady
Demystifying USB To Serial
It's time to stop talking and start soldering. This month, you have your choice of USB projects.

Smiley’s Workshop by Joe Pardue
Smileys Workshop: An AVR C Programming Series (Part 8)
Interrupts, I/O Registers, and the Butterfly Joystick.

Personal Robotics by Vern Graner
Robotics on a Budget
Most towns have a thrift store or other shops that recycle and resell clothes, toys, household wares, and the like. In many cases, you'll find these stores carry lots of useful electronics that can be picked up for a song.

Near Space by L. Paul Verhage
BalloonSat Minis
BalloonSat Minis: One small step for a PICAXE, One giant leap for a BalloonSat Design.

Getting Started With PICS by Chuck Hellebuyck
SPI Communication
In my January column, I described the I2C form of serial communication. This month, I am covering its cousin — the Serial Peripheral Interface or SPI communication.

Departments

Developing Perspectives by Bryan Bergeron
Please visit our Developing Perspectives blog to read the full article and comment.