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Features

You’ll Flip Over This Coin Toss Circuit by Jim Stewart
Exclusive Online Article: It’s Friday night and you’re hungry, so you decide to go pick up some food. Maybe a pizza, or maybe some kungpao chicken. You love them both, but you must choose one or the other. Do you flip a coin? Sure! But now, you can do it electronically! Let’s build a coin toss circuit!

How To: A Wire Wrapping Primer by Vaughn D. Martin
Wire wrapping is a technique for constructing single or small numbers of simple to moderately complex electronic assemblies.

Projects

Build A Ballistic Chronograph by David Collins
Wanna know how fast your projectile is going? Than you need to build this!

Ultra Low Power CMOS Water Sensor by Michael Mullins
Don't let water dripping from your ceiling be your first indication you've got a leak. You can build this handy device in just a couple hours.

Turning A Microwave Oven Into A Darkroom Timer by Al Jaszek
Find out what you can do with a dead microwave, a wooden box, a power cord, and a socket.

Columns

Techknowledgey by Jeff Eckert
TechKnowledgey 2009
Topics covered include cold fusion... it's back, new Minis arrive, PUMAs, chip sales bottoming, pluys other cool stuff.

The Design Cycle by Fred Eady
Into the Guts of USB Drivers
When it comes to replacing a Legacy RS-232 Interface with USB, try a Microchip PIC18F14K50 USB Flash microcontroller.

Open Communication by Louis E. Frenzel
Smart Phones Leading Cellular Growth
The cell phone has become a must-have item in our modern life. You pick it up when you grab your car keys and wallet or purse every day.

Q&A by Russell Kincaid
Q&A
EV battery charger, 90 VDC power supply magic, getting an A+ in class D, plus more.

Smiley’s Workshop by Joe Pardue
Smiley’s Workshop: An AVR C Programming Series (Part 11)
Getting started with the Arduino Projects Kit

Personal Robotics by Vern Graner
Das BlinkenBoard
After considering various processors, it was decided that the Atmel ATtiny84 was the "just right" chip for this specific job.

PICAXE Primer by Ron Hackett
Taming Unruly LCD’s: Part 2
The 14M is the perfect processor for this project. It has more than enough I/O lines and program memory for the task at hand and it’s cheap enough that you can construct two or three complete “serialized” LCDs for the price of one commercial display.

Departments

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