Techknowledgey
by Jeff Eckert
Techknowledgery 2009 | December 2009
Topics covered include a $10 million buzz, adapter to simplify sharing
digital content, vintage Mac fetches $8260, plus other stuff. Page 10
Smiley’s Workshop
by Joe Pardue
Smileys Workshop: An AVR C Programming Series (Part 17)
Simple motor speed control using the Arduino. Page 14
Q&A
by Russell Kincaid
Q&A | December 2009
Wind chime light show, DC-to-DC converter, bug zapper, plus more. Page 22
The Design Cycle
by Fred Eady
Find the HIDden virtues of USB
While we were extolling the virtues of USB as an RS-232 killer, we were
totally ignoring one of USB’s greatest strengths: the HID class. Page
49
Personal Robotics
by Vern Graner
The Parallax Stingray Robot
Stronger than a BOEBOT, more powerful than a pen-wielding Scribbler,
easier to carry than a QuadRover, the Parallax Stingray mobile robotic
platform has landed! Page 56
PICAXE Primer
by Ron Hackett
Interfacing Seven-Segment LCD Displays
This time,we’re going to experiment with interfacing seven-segment LED
displays with PICAXE processors.To explore the basic concepts involved,
we’ll begin with the simplest case: interfacing a single-digit LED
display with a 20M processor. Page 62
Open Communication
by Louis E. Frenzel
New Integrated Circuits Make Wireless Easier
The one thing that has made wireless so easy to implement everywhere is
the integrated circuit. The single chip radio transceiver is a common
device and it is available in many forms to give us the huge number of
communications options we have today. Page 68
