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22 Build an Electronic Lock
Here’s a simple and inexpensive electronic key
system you can incorporate into various items
that can be constructed with or without
■ By Devlin Gualtieri
28 Build a Wireless Freezer Alarm
With the cost of food constantly rising,
you don’t want to risk losing anything to an
undetected malfunction. Keep this alarm handy
to alert you if your freezer goes on the fritz.
■ By Ron Newton
34 Arduino Based Data Acquisition
If you enjoy data and acquiring and measuring it
easily, then you’re going to love this method that
utilizes Microsoft Excel and PLX-DAQ from Parallax
with a low cost Arduino.
■ By Eric Bogatin
08 TechKnowledgey 2014
Events, Advances, and News
Read about gearing up for
communications, an Io T starter
kit in the offing, wising up your
vehicle, looking young again,
plus some other stuff.
Get help with finding components and using
ice melt tape controls.
14 The Spin Zone
Tag ’Em, Danno!
Passive RFID tags are very popular devices for
access control, and now they’re affordable.
68 Near Space
Approaching the Final Frontier
CubeSats — Part 4.
Programs to Launch CubeSats. Discover some of the
ways these mini satellites are reaching space, and
are making personal space exploration a reality.
42 Using Serial Bluetooth
With a Microcontroller
See how to stream serial data via Bluetooth and
build a Crystal Palace in the process.
■ By Craig A. Lindley
48 Fix Up that Old Radio!
In this final installment, go through the rest of the
repair process, a first power-up, and aligning the
radio’s tuning dial on our 1937 De Wald classic.
■ By J. W. Koebel
56 Beyond the Arduino — Part 4
All we want to do is talk to our microcontroller.
So, let’s do it the old fashioned way: using serial
■ By Andrew Retallack
72 Practical 3D Printing
Real World Uses for the
Tool Stand for Low Cost Rotary Tool.
Need more room on your workbench? Then, create
custom holders for your tools and their accessories.
74 The Design Cycle
Advanced Techniques for
Adding a microSD Card Demystified.
You don’t have to be a certified rocket scientist to
add microSD capability to your 32-bit PIC
microcontroller project. This edition of Design Cycle
will demystify the process of adding a microSD card
to your design. To make adding that microSD
worthwhile, we will also implement a PIC32MX
20 NEW PRODUCTS
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4 June 2015