Projects & Features
28 Build the Voltage Mirror
Instead of having to redesign certain projects, put a voltage mirror
into place. Voltage mirrors give you a copy of the input voltage,
but with the polarity swapped.
■ By Jim Stewart
32 Build the Mystery Solar Powered Pendulum
Amaze and mesmerize your friends and family with this fun
gadget that is based on BEAM technology.
■ By David Williams
36 Build the Alarm Autodialer
Not only will this device detect household failures related to
heating, cooling, plumbing, and electrical, but it will call to
let you know if anything is going on.
■ By Dan Gravatt
41 A Proper Ringing of the Bells
See the art of engineering at work when an
older system for ringing church bells needed
■ By Chris Watson
46 Design a Customized Security
System Using RobotBASIC
Implementing a custom security system for
your home can be intimidating — unless you
have the right software. This article guides
you through the basic principles so you can
design exactly what will work for you.
■ By John Blankenship and Samuel Mishal
10 TechKnowledgey 2012
Events, Advances, and News
Read about a new PC for bottom-feeders,
an automotive mystery that gets solved, the vacuum
tube as the next high tech breakthrough ... plus
some other interesting stuff.
14 PICAXE Primer
Sharpening Your Tools of Creativity
Further Explorations With PICAXE
20 Q & A
Reader Questions Answered Here
Answers to questions on a simple magnetizer,
random traffic lights, and a headset amplifier
are a few of the topics covered this time.
52 Smiley’s Workshop
Programming • Hardware • Projects
Fritzing With the Arduino — Part 1.
26 NEW PRODUCTS
64 NV WEBSTORE
78 TECH FORUM
81 AD INDEX
6 August 2012
FUNdamentals For Beginners
74 Ohm’s Law
60 Open Communication
The Latest in Networking and
M2M —Machine-to-Machine Communications.
68 The Design Cycle
Advanced Techniques for Design Engineers
Putting Basic4android in the Driver’s Seat.
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