March ’ 16
Nuts & Volts — PO Box 15277
North Hollywood, CA 91615-9218
Call 877-525-2539 or go to www.nutsvolts.com
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26 PiBooth — A Raspberry Pi
Based Photo Booth
Photo booths have always been a lot of fun. Now that
there are digital cameras available, we can take photo
booths up to a whole new level using a Raspberry Pi and
a handful of other parts. Plus, this one is portable, so it’s
easy to add some high entertainment value to your next
event no matter where it is.
■ By John Leeman
34 Techniques to Improve Your
We all want to avoid noise, which is basically an
unwanted signal. What do you do, then, if your output
level or source signal is at a fixed volume or strength and
can’t go any stronger? Discover some simple techniques
that help you deal with this issue and improve the signal-
to-noise ratio in your projects.
■ By Beau Schwabe
38 Make Your LED Dance Just Like
Looking to add some dynamic lighting to your room?
Then, modulate an LED to respond to the world around it
with this simple technique.
■ By Eric Bogatin
08 TechKnowledgey 2016
Events, Advances, and News
Some of this month’s topics include becoming a GMO,
faxing for free, cheap meters, and the value of an Apple 1.
Reader Questions Answered Here
This time around, Commodore 64 video problems are
addressed, plus a reliability tutorial on electronic devices
18 The Spin Zone
Adventures in Propeller Programming
More Hot & Sticky
If you haven't explored humidity and temperature
measurement due to the higher cost of precision sensors,
the DHT11 is an inexpensive gateway to a lot of fun.
50 The Design Cycle
Advanced Techniques for Design Engineers
JumpStart Your Coding for ARMs
Have you been wanting to start coding for ARM
microcontrollers and found that you would have to give
up an ARM and a leg in the learning curve? Well, you can
keep all of your limbs as you’ll need them to immediately
start coding for ARM microcontrollers with ImageCrafts’
57 The Ham’s Wireless
Practical Technology from the Ham World
When RF energy travels in a transmission line and
encounters a load or different type of line, the resulting
reflections create standing waves of voltage and current,
just as water waves do when they encounter an
obstruction. This can create problems with digital signals
and can result in extra losses. However, there are several
techniques for dealing with these reflections.
Think you know your stuff? Well, try your
hand at our new quarterly feature — a quiz
that will test your memory and your wits.
■ By David Goodsell
When All You Have
is a Hammer
06 READER FEEDBACK
24 NEW PRODUCTS
48 NV WEBSTORE
62 TECH FORUM
65 AD INDEX
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4 March 2016