Design Con 2015

DIY

Suzanne Deffree
Editor
Home for DIY (do it yourself) hobbyist, hackers, and honed engineers where you can exchange ideas and design knowledge on electronics. Find answers to DIY challenges and new opportunities amongst a community of skilled electronics makers.

Foraged crabapple jelly – a delicious DIY holiday a gift

Crabapple jelly is a perfect "gateway drug" to get you hooked on home preserves because it's one of the easiest of jellies to make and, if you find the right fruit, one of the most delicious. Although seldom found in stores, there's a good chance you can forage your own crabapples from trees growing within a short drive of your house. Read More...

T&M auction fever

I visit an auction house, and ponder how the items would look in my lab. Read More...

Help save a part of engineering history

The first house to have a telephone is up for sale. You can help turn it into a museum. Read More...

Sir Clive Sinclair interview, ZX Spectrum relaunched for retro gameplay

We talk with Sir Clive Sinclair about his latest project, a dedicated game machine that comes with 1,000 classic Spectrum games. Read More...

Circuit simulates a loudspeaker's impedance curve

Testing an audio amp, and want a better test load than just a resistor, or an actual speaker? Read on. Read More...

Sleep easy with this desk fan speed reducer

This innovative AC motor control skips cycles. Read More...

Fusion heats up

Could 2015 be the year for significant news in nuclear fusion reactor research? Maybe. Read More...

Make high-quality double-sided PCBs – at home

Be rewarded with near-pro quality PCBs by following the method detailed here. Read More...

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Sleep easy with this desk fan speed reducer

This innovative AC motor control skips cycles. Read More...

Bad-bulb finder fixes Christmas lights

15 years later, here’s a new take on one of our most popular Design Ideas ever! Read More...

Monitor 15 contacts with one PIC input

Take advantage of a microcontroller’s feature set to simplify switch & contact interface. Read More...

Simple pulse oximetry for wearable monitor

Use this circuit as the “heart” of a pulse oximeter and oxygen saturation monitor. Read More...

Short circuit tracer/finder uses low power

Build this bench tool and become a master at pinpointing shorts. Read More...

Add phases to simple RC oscillator

Here’s a simple way to add one or more output phases to an RC oscillator. Read More...

3 pins, 3 LEDs, 3 buttons

This LED multiplexing scheme allows for switches in the matrix too. Read More...

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Arduino LED controller shield makes complex RGB LED lighting apps a snap

The Arduino-compatible lighting RGB LED lighting shield reviewed here was designed to give designers a low-cost easy-to-use open-source platform for fast prototyping and inexpensive evaluation of multiple LED light engines. Read More...

FPGA boards under $100: Altera/Terasic DE0-Nano

A close look at the Cyclone IV-based $79 DE0-Nano FPGA devboard from Terasic. Read More...

EDN Hot 100 products of 2014

Of the many thousands of products announced during the past year, these are 100 that especially caught the attention of our editors and our readers. Read More...

EDN Hot 100 products of 2014: Boards & Development Tools

This section of EDN's Hot 100 Products of 2014 includes development tools - both hardware and software based - and system-level components. Read More...

$20 Raspberry Pi Model A+ is smaller, uses less power

The Raspberry Pi Foundation has unveiled the Raspberry Pi A+ - a smaller version of its original Model A - that costs only $20. Read More...

Raspberry Pi accessory GPS, accelerometer and prototyping modules

Distributor element14 has launched the Microstack range, a series of accessories for the Raspberry Pi that will make it quicker and simpler for all levels of user to create and prototype physical devices. Read More...

Free PCB design tool includes 3D modeling, crowd-sourced parts database

CircuitMaker PCB design tools' 3D modeling and other features will help designers deal with the "lumpy" nature of LED lighting products or other design projects involving large, irregular components. But that's only half of the story. Read More...

Desktop PCB factory turns your design into a working circuit in 30 minutes

What would you do if you could turn the schematic you sketched on the back of a napkin during your lunch break into a fully-assembled circuit before your afternoon coffee break? Read More...

New Raspberry Pi model adds pins, ports, and lower power

An update of the Raspberry Pi Model B - called the Raspberry Pi Model B+ - incorporates numerous small improvements that have been requested by users. Read More...

FPGA boards under $100: Introduction

I’m kicking off a major series of hands-on reviews of sub-$100 FPGA boards, so hop on “board” as we start our exploration. Read More...

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Chumby offers opportunity for home engineering

Because anyone can submit an app and Chumby Industries has been very open to hacking the Linux kernel, there are several ways to change the firmware with OpenEmbedded to tailor the Chumby One to your own needs. Read More...

Rummage through a Roomba: Sensor-packed vacuum robot attracts hacks

This autonomous robot packs a series of sensors and motors to not only vacuum homes the world over, but also double as a robotic platform for would-be developers. Read More...

Prying apart a portable audio player

Prying Eyes: A look inside Sandisk's Sansa M250 reveals platform minded design decisions, surprising flash-memory choices, and potential hacks. Read More...

Evaluate your application's energy-harvesting vibrational profile with a Slam Stick

To know whether your application is suitable for vibrational energy harvesting, you must determine its vibrational profile. Mide Technology's Slam Stick data logger and open-source software can ease your profiling task. Read More...

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Foraged crabapple jelly – a delicious DIY holiday a gift

Crabapple jelly is a perfect "gateway drug" to get you hooked on home preserves because it's one of the easiest of jellies to make and, if you find the right fruit, one of the most delicious. Although seldom found in stores, there's a good chance you can forage your own crabapples from trees growing within a short drive of your house. Read More...

Make high-quality double-sided PCBs – at home

Be rewarded with near-pro quality PCBs by following the method detailed here. Read More...

Stovetop computing puts a DIY twist on the Thanksgiving turkey

Trey German used an inexpensive microcontroller board to create a open-source Wi-Fi-controlled sous vide cooker which makes perfectly-cooked poultry that's even juicier, tastier and tenderer than a deep-fried bird. Better yet, he's publishing the design so you can build one too. Read More...

Designing building & installing a homemade 12VDC LED lighting system

With the arrival of the LED lighting revolution and efficient DC-DC converters, an engineer revisits his cabin’s battery-powered lighting system. Read More...

A guide to selecting power supplies for LED lighting applications

In order for your solid-state lighting design to realize its full efficiency, durability, and longevity, you'll need to choose a power supply with characteristics that closely match the requirements of your application and the LEDs you're using. Read More...

Copperclad Road (with apologies to Steve Earle)

An ECL warrior battles the copperclad to produce a high-performance breadboarded test fixture. Read More...

10 free math analysis and design tools for engineers

Back by popular demand is another round of free tools that engineers and DIYers can use with their various projects. Read More...

3D printing expands beyond makers

Although technical and pricing challenges remain, 3D printing has evolved from a medium used by an exclusive few to a manufacturing trend that some believe will see widespread adoption in 2014. Read More...

Try an oscilloscope for under $200

You can get an oscilloscope for under $200. Some are even worth investigating for your toolbox. Read More...

Power to the people: the democratization of engineering

When it comes to open source, software is years ahead of hardware. But with encouragement from established electronics industry players and moves from makers and hackers, engineers could see open-source hardware and an increasingly democratized, community-based approach worked into and enhancing their design cycles. Read More...

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8 open-source holiday gifts

Complete your holiday shopping with these 8 open-source, out-of-the-box devices, kits, and components for DIY designing. Read More...

T&M auction fever

I visit an auction house, and ponder how the items would look in my lab. Read More...

Help save a part of engineering history

The first house to have a telephone is up for sale. You can help turn it into a museum. Read More...

LED-lit urban farms aim to transform blighted cities with jobs, fresh food

A group of high-tech urban pioneers is using LEDs to power an indoor vertical farming system that will create good paying jobs and delicious pesticide-free greens. Read More...

Contest winners target environmental problems

Participants in the North Texas Apps Challenge talk about the winning ideas that scored $80,000. Read More...

Top 10 robotics projects on Kickstarter in 2014

Take a look at the newest robots coming down the pike. These inventors are making everything from educational toys to industrial tools. Read More...

Sir Clive Sinclair interview, ZX Spectrum relaunched for retro gameplay

We talk with Sir Clive Sinclair about his latest project, a dedicated game machine that comes with 1,000 classic Spectrum games. Read More...

Circuit simulates a loudspeaker's impedance curve

Testing an audio amp, and want a better test load than just a resistor, or an actual speaker? Read on. Read More...

HyperCat spec seeks to simplify IoT device interactivity

Repurposing data from IoT devices is a great idea, but first you have to find the devices and understand their data. Enter HyperCat. Read More...

Classic oscilloscope front panels show how it's done

Scope front panels can teach us lessons about design and ergonomics. Let's look at some older ones, including the best front panel ever. Read More...

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