December Circuit Cellar: A Sneak Preview

The December issue of Circuit Cellar magazine is coming soon. Want a sneak peak? We’ve got a great selection of excellent embedded electronics articles for you.

Not a Circuit Cellar subscriber?  Don’t be left out! Sign up today:

 Here’s a sneak preview of December Circuit Cellar:

MICROCONTROLLERS IN MOTION

Special Feature: Electronics for Wearable Devices
Circuit Cellar Chief Editor Jeff Child examines how today’s microcontrollers, sensors and power electronics enable today’s wearable products.

329 Cover Screen CapSimulating a Hammond Tonewheel Organ
(Part 2)

Brian Millier continues this two-part series about simulating the Hammond tonewheel organ using a microcontrollers and DACs. This time he examines a Leslie speaker emulation.

Money Sorting Machines (Part 1)
In this new article series, Jeff Bachiochi looks the science, mechanics and electronics that are key to sorting everything from coins to paper money. This month he discusses a project that uses microcontroller technology to sort coins.

Designing a Home Cleaning Robot (Part 1)
This four-part article series about building a home cleaning robot starts with Nishant Mittal discussing his motivations behind to his design concept, some market analysis and the materials needed.

SPECIAL SECTION: GRAPHICS AND VISION

Designing High Performance GUI
It’s critical to understand the types of performance problems a typical end-user might encounter and the performance metrics relevant to user interface (UI) design. Phil Brumby of Mentor’s Embedded Systems Division examines these and other important UI design challenges.

Building a Robotic Candy Sorter
Learn how a pair of Cornell graduates designed and constructed a robotic candy sort. It includes a three degree of freedom robot arm and a vision system using a Microchip PIC32 and Raspberry Pi module.

Raster Laser Projector Uses FPGA
Two Cornell graduates describe a raster laser projector they designed that’s able to project images in 320 x 240 in monochrome red. The laser’s brightness and mirrors positions are controlled by an FPGA and analog circuitry.

ELECTRICITY UNDER CONTROL

Technology Spotlight: Power-over-Ethernet Solutions
Power-over-Ethernet (PoE) enables the delivery of electric power alongside data on twisted pair Ethernet cabling. Chief Editor Jeff Child explores the latest chips, modules and other gear for building PoE systems.

Component Overstress
When an electronic component starts to work improperly, Two likely culprits are electrical overstress (EOS) and electrostatic discharge (ESD). In his article, George Novacek breaks down the important differences between the two and how to avoid their effects.

AND MORE FROM OUR EXPERT COLUMNISTS:

Writing the Proposal
In this conclusion to his “Building an Embedded Systems Consulting Company” article series, Bob Japenga takes a detailed look at how to craft a Statement of Work (SOW) that will lead to success and provide clarity for all stakeholders.

Information Theory in a Nutshell
Claude Shannon is credited as one of the pioneers of computer science thanks to his work on Information Theory, informing how data flows in electronic systems. In this article, Robert Lacoste provides a useful exploration of Information Theory in an easily digestible way.

November Circuit Cellar: A Sneak Preview

The November issue of Circuit Cellar magazine is coming soon. Want a sneak peak? We’ve got a great section of excellent embedded electronics articles for you.

Not a Circuit Cellar subscriber?  Don’t be left out! Sign up today:

Here’s a sneak preview of November Circuit Cellar:

TECHNOLOGY IN A CONNECTED WORLD

IoT Gateway Advances Take Diverse Paths: Flexible Networked Solutions
The Internet-of-Things (IoT) phenomenon offers huge opportunities. Circuit Cellar Chief Editor Jeff Child explores how IoT gateways play a vital role in those systems by providing Nov 328 coverbidirectional communication between the devices in the field and the cloud.

Power Analysis Attack on RSA: Asymmetric Adventures
Colin O’Flynn has done a number of great columns about cryptography—in particular symmetric cryptography. This time he’s tackling an asymmetric algorithm: a RSA implementation. Colin describes what’s unique about an RSA cryptosystem and takes us through a power analysis attack.

FOCUS ON ANALOG

Analog Solutions Fuel Industrial System Needs: Connectivity, Control and IIoT
Whether it’s connecting with analog sensors or driving actuators, analog ICs play many critical roles in industrial applications. Here, Circuit Cellar Chief Editor Jeff Child examines the latest analog technologies and products serving the needs of today’s industrial systems.

Using Power Audio Amplifiers in Untypical Ways (Part 2): More Alternative Uses
In Part 1 Petre Petrov described many interesting ways to use power audio amplifiers (PAAs) as universal building blocks similar to the op amps and comparators. Here, he discusses several more things that can be built from PAAs including wave generators and transformer drivers.

SPOTLIGHT ON MONITORING AND TESTING

Gas Monitoring and Sensing (Part 2): Putting the Sensor to Work
Columnist Jeff Bachiochi continues his exploration of gas monitoring and sensing. This time he discusses some of the inexpensive sensors available that can be applied to this application. Jeff then tackles the factors to consider when calibrating these sensors and how to use them effectively.

Logger Device Tracks Amp Hours (Part 2): Alternative Energy Sources
n this follow on to Part 1 of his story, William Wachsmann describes putting to use the amp-hour logger he built using a microcontroller and a clamp-on ammeter. This time he discusses modifying the amp-hour software so it can be used as an analog input logger to measure solar and wind power.

Negative Feedback in Electronics: A Look at the Opposite Side
Complementing his discussion last month on positive feedback, columnist George Novacek now takes a look at negative feedback. Just like positive feedback, negative feedback can significantly change or modify a circuit’s performance.

LF Quartz Resonator Tester: A Stimulating Discussion
Ed Nisley returns to the rich topic of low-frequency quartz resonators. This time he describes a tester built with an ordinary Arduino Nano and an assortment of inexpensive RF modules.

INTERESTING EMBEDDED PROJECTS

Simulating a Hammond Tonewheel Organ (Part 1) Mimicking a Mechanical Marvel
Hammond tonewheel organs were based upon additive sine-wave synthesis. Because of that, it’s possible to simulate the organ using a microcontroller program that feeds its output waveform to a DAC. Brian Millier takes on this project, making use of an ARM-based Teensy module to do the heavy lifting.

Machine Auto-Sorts Resistors: MCUs, Measurement and Motor Control
Typical electronics lab benches become littered with resistors from past projects. These three Cornell University graduates tackled this problem by building a resistor sorting system. It enables users to input multiple resistors, measure their resistance and sort them. The project integrates motor controllers, resistance measurement and a graphical user interface.

October Circuit Cellar: A Sneak Preview

The October issue of Circuit Cellar magazine is on the launch pad, ready to deliver a selection of excellent embedded electronics articles covering trends, technology and design.

Not a Circuit Cellar subscriber?  Don’t be left out! Sign up today:

 

Here’s a sneak preview of October Circuit Cellar:

TECHNOLOGY FOR DRONES / ROBOTIC HAND

Commercial Drone Design Solutions Take Flight: Chips, Boards and Platforms
The control, camera and comms electronics inside today’s drones have to pack in an ambitious amount of functionality. Circuit Cellar Chief Editor Jeff Child explores the latest Oct 327 Coverand greatest chip and module solutions serving today’s commercial and consumer drone designs.

Building a Robot Hand: With Servos and Electromyography
Learn how three Cornell University students developed a robotic hand. The system captures impulses generated by muscle contractions and then filters and feeds those signals to a microcontroller which controls finger movement.

 

CAN’T STOP THE SIGNAL

Signal Chain Tech Pushes Bandwidth Barriers: ADCs, FPGAs and DACs
FPGAs and D-A converters are key  technologies making up a signal chain. Here, Circuit Cellar Chief Editor Jeff Child steps through the state-of-the-art options available for crafting efficient, highly-integrated signal-centric systems.

Antenna Performance Measurement Made Easy: Covering the Basics
If you’re doing any kind of wireless communications design, chances are you’re including an antenna. Columnist Robert Lacoste shows how the task of measuring an antenna’s performance is less costly and exotic than you’d think.

MONITORING GEAR WITH MICROCONTROLLER BRAINS

Gas Monitoring and Sensing (Part 1): Fun with Fragrant Analysis
Columnist Jeff Bachiochi covers the background issues surrounding gas monitoring and sensing. Then he describes how he uses sensors, A/D conversion and Arduino technologies to do oxygen measurement.

Logger Device Tracks Amp Hours (Part 1): Measuring Home Electricity
Setting out to monitor and log electricity usage in his house, Bill Wachsmann built an amp-hour logger using a microcontroller and a clamp on ammeter.

KEEPING THE LEGACY ALIVE

Emulating Legacy Interfaces: Do it with Microcontrollers
There’s a number of important legacy interface technologies—like ISA and PCI—that are no longer supported by the mainstream computing industry. In his article Wolfgang Matthes examines ways to use microcontrollers  to emulate the bus signals of legacy interconnect schemes.

Building a Retro TV Remote : PIC MCU-Based Design
Dev Gualtieri embarks on building a retro-style TV remote, based on a Microchip PIC microcontroller. He outlines the phototransistor, battery and software designs he made along the way.

AND MORE FROM OUR EXPERT COLUMNISTS:

Get in the Loop on Positive Feedback: New Value in an Old Concept
Positive feedback loops are an important element of modern circuitry such as crystal oscillators, PLLs and other devices. Here, George Novacek goes deep into the math and circuit analysis of positive feedback and how it’s used in electronics.

Build an Embedded Systems Consulting Company (Part 6): Trade-Offs of Fixed-Price Contracts
Continuing his “Building an Embedded Systems Consulting Company” article series, this month Bob Japenga explores the nature of contracts and how fixed price contracts can be an effective, albeit dangerous tool in marketing.

September Circuit Cellar: A Sneak Preview

The September (326) issue of Circuit Cellar magazine serves up a meaty selection of useful technology resources along with inspiring, interesting embedded electronics design articles.

Not a Circuit Cellar subscriber?  Don’t be left out! Sign up today:

cclogo_2013_header

Here’s a sneak preview of September Circuit Cellar:

FOCUS ON MICROCONTROLLERS

Getting Started with PSoC Microcontrollers (Part 3): Data Conversion, Capacitive Sensing and More
In Part 3, Nishant Mittal gets into some if the PSoC’s more complex features like Data Conversion.

Implementing a Time-Oriented Task Manager for 8-bit PIC Microcontrollers
Pedro Bertoleti shows readers how to build a time-oriented task manager using Microchip’s PIC 16F628A 8-bit microcontroller.

SPECIAL SECTION: EMBEDDED SECURITY

Microcontrollers Beef Up Security Features: Defense in a Connected World
Jeff Child explores the various flavors of embedded security features that microcontroller vendors are adding to their devices.

Resources for Embedded Security: Hardware, Software and Services
Circuit Cellar collects four pages worth of info about companies that provide embedded security products, tools and services.

TECHNOLOGY FEATURES

Using Power Audio Amplifiers in Untypical Ways (Part 1): Best Building Blocks
Petre Petrov shows readers how to use PAAs as universal building blocks to create analog signal generators, analog power supplies, voltage splitters and more.

Data Acquisition Advances Focus on Interfacing
Jeff Child discusses the latest data acquisition solutions, with a look at how interface technologies have evolved.

Future of IoT Communications: Will Upgraded Cellular Networks Benefit IoT?
This guest essay by Andrew Girson, CEO of Barr Group, explores how IoT will fare in the 5G network era.

MORE FROM OUR EXPERT COLUMNISTS:

Block Diagram Reduction and Automatic Tuning
George Novacek steps through how to think in terms of block diagrams to help you reduce system complexity early on in a design.

Numeric Precision vs. DDS Calculations
Using the full frequency resolution of a DDS chip outstrips the capabilities of floating point numbers. Ed Nisley looks at high-res frequency calibration and measurements in the DDS realm.

Deadbolt the Uninvited: Locked Out of My Home
In this Part 2 of Jeff Bachiochi’s electronic lock story, he gets into some of the power and remote-control issues of his electronic deadbolt lock project.

Diagnosing Performance Variations in HPC
Ayse K. Coskun delves into how application performance variations can cause inefficiency
in high-performance computing (HPC) systems and how to diagnose these variations.

August Circuit Cellar: A Sneak Preview

The August (325) issue of Circuit Cellar magazine is jammed packed with useful technical information and inspiring, intriguing embedded electronics design stories.

Not a Circuit Cellar subscriber?  Don’t be left out! Sign up today:

 

Here’s a sneak preview of August Circuit Cellar:

FUN WITH GUITAR AMPLIFIERS!

Digital Guitar Amplifier/ Effects Processor—Part 2
Brian Millier details the digital guitar amplifier/effects unit he built using two Teensy Arduino modules.

A Range of Power Supplies for Hollow-State Guitar Amplifiers
Richard Honeycutt compares several different power supplies used for hollow-state guitar amplifiers.

MICROCONTROLLERS & PROCESSORS!

Firmware Upgrade with the PIC32
Nick Sicalides delves into performing firmware upgrades using a bootloader on the Microchip PIC32

Getting Started with PSoC Microcontrollers (Part 2): Putting PSoC to Work
Nishant Mittal goes even deeper on the Cypress PSoC providing some useful design examples.

Moore’s Law and the Chip Industry’s Perfect Storm
In this Interview Q&A Krste Asanovic explains RISC-V and the open sourcing of processor architecture.

SECURITY & RELIABILITY & ENCRYPTION!

Power Analysis of a Software DES Encryption Routine
Columnist Colin O’Flynn examines how to break a software implementation of the DES security routine.

Reliability and Failure Prediction: A New Take
Craig Armenti and Dave Wiens discuss a better way to simulate PCB vibration and acceleration.

Preventing Unwanted Entry
Columnist Jeff Bachiochi takes us inside his exploration of electronic lock systems, getting down to the fine details.

Future of Embedded Security: Wi-Fi to the Danger Zone
This guest essay by Adam Cecchetti, CEO of Deja vu Security, explains how memory leaks in your embedded system could have life or death consequences.

AND MORE FROM OUR EXPERT COLUMNISTS:

Automatic Control (Part 4) The Implementation
George Novacek describes the PID temperature controller he built for a meat smoker.

Fully Differential Amplifiers
Robert Lacoste sings the praises of fully differential amplifiers and presents a few designs using them.

Build an Embedded Systems Consulting Company (Part 5) Axiom Wrap-Up
Bob Japenga shares more insights on running a successful embedded design firm built to last.

Circuit Cellar Kindle Edition

CC Amazon KindleKindle fans, check this out! Circuit Cellar is now available on Kindle through Amazon’s Newsstand. Purchase the current issue, or save 54% with a Kindle subscription.

It’s never been easier to keep up with the latest embedded technologies, and now you can take your Circuit Cellar magazine with you on the go. With the new Kindle Edition, you can make notes, highlight key passages, and bookmark pages wherever you happen to be!

Act now! The subscription comes with a risk-free 30-day free trial period. Learn More

Circuit Cellar is a monthly magazine (print and digital) covering the topics of embedded hardware, embedded software, electrical engineering, and computer applications. Twelve times per year, Circuit Cellar reaches a diverse international readership of professionals, academics, and electronics specialists who work with embedded, MCU-related technologies on a regular basis. The editorial department’s goal is to assist each reader in becoming a well-rounded, multidisciplinary practitioner who can confidently bring innovative, cutting-edge engineering ideas to bear on any number of relevant tasks, problems, and technologies.

Submitting to Circuit Cellar Just Got Easier

submit imageCircuit Cellar’s new online article and proposal submission form makes contributing easier than ever. Check it out.

Circuit Cellar publishes articles (Circuit Cellar magazine), books, and website content by talented authors on electrical engineering-related topics. When you publish with Circuit Cellar, you are reaching an educated professional audience of engineers, programmers, and academics around the globe. Professional engineers, academics, students, and serious electronics enthusiasts are encouraged to submit articles and proposals.

Our editors carefully review all proposals and finished submissions before making final decisions about publication. The review process can take a few weeks. Your work must be your own and original. Your article should meet all the requirement specified in the Authors Guide.

2016 Editorial Calendar

  • 306 January – Embedded Applications
  • 307 February – Wireless Communications
  • 308 March – Robotics
  • 309 April – Embedded Programming
  • 310 May – Measurement & Sensors
  • 311 June – Communications
  • 312 July – Internet & Connectivity
  • 313 August – Embedded Development
  • 314 September – Data Acquisition
  • 315 October – Signal Processing
  • 316 November – Analog Techniques
  • 317 December – Programmable Logic

You can either use our online submission form or email our editors at editor@circuitcellar.com.

Data Communication Between “Smart” Pendants

As head of the Computer Science and Software  Engineering department at Penn State Erie, The Behrend College, Chris Coulston is busy.

But not too busy to surf the ‘Net for design inspiration.

And one of his latest projects may earn him the title of “social jewelry designer,” along with college professor and department chair.

In the June issue of Circuit Cellar, Coulston writes about his design and construction of an RGB LED pendant that “cycles through a color sequence, detects when another pendant is brought into its proximity, and communicates color sequence information to the other pendant through its LED.” The heart of the design is a Seoul Semiconductor SFT722 RGB LED.

Coulston was online a few years ago when he ran across the first half of his project inspiration—a Mitsubishi Electric Research Laboratories technical report titled “Very Low-Cost Sensing and Communication Using Bi-directional LEDs.” The report, Coulston says, “describes how an ordinary LED with no additional circuitry can act as a full-duplex communication channel.”

Pendant’s two boards

His remaining inspiration came from an article he recalled appearing in Circuit Cellar a decade ago.

The Mitsubishi labs technical report “got me thinking about Jeff Bachiochi’s article ‘Designing with RGB LEDs’ (Circuit Cellar 159, 2003), in which the challenges associated with designing a piece of LED jewelry are described,” Coulston says. “The fusion of these two ideas was the inspiration for my social jewelry design.”

Coulston’s design includes a pair of circuit boards, the upper containing the LED and analog circuitry and the lower containing the microcontroller.

“The prototype pendant is mainly controlled through a USB-to-USART bridge,” Couston says. “Its power is supplied by the same connection.”

He invites anyone who is  “curious how an LED can be used as a transceiver and how it’s used to build a piece of social jewelry” to read his article. You’ll find it in next month’s issue of Circuit Cellar.

June Issue: Vehicle Tracking, Bit Banging, and More

Circuit Cellar’s June issue is now online, outlining DIY projects ranging from an automated real-time vehicle locator to a  GPS-oriented solar tracker and offering solid advice on bit banging, FPGA reconfiguration, customizing the Linux kernel, and more.

June issueA persistent problem typically sparks the invention of projects featured in our magazine. For example, when the campus at Penn State Erie, The Behrend College, had a growth spurt, the local transit authority provided a shuttle bus to help students who were rushing from class to class. But ridership was low because of the bus’ unpredictable schedule.

So a college engineering team constructed a mobile application to track the bus. That system inspired the cover of our June issue and complements its communications theme.

The three-part system consists of a user’s smartphone running a HTML5-compatible browser, a base station consisting of an XTend 900-MHz radio connected to a Raspberry Pi single-board computer, and a mobile tracker including a GPS receiver, a Microchip Technology PIC18F26K22 microcontroller, and an XTend module.

The Raspberry Pi runs a web server to handle requests from a user’s smartphone. The user then receives accurate bus arrival times.

Also aligning with June’s theme, we present an article about implementing serial data transmission through bit banging. You’ll gain a better understanding of how serial data is transmitted and received by a microprocessor’s hardware UART peripheral. You’ll also learn how bit banging can achieve serial communication in software, which is essential when your embedded system’s microprocessor lacks a built-in UART.

Recognizing a rapidly unfolding communications trend, this issue includes an inventor’s essay about how the presence of Bluetooth Low Energy (BLE) in the latest mobile devices is sparking a big boom in innovative hardware/sensor add-ons that use your smartphone or tablet as an interface. Other communications-related articles include Part 2 of a close look at radio-frequency identification (RFID). This month’s installment describes the front-end analog circuitry for the RFID base station of a secure door-entry project.

In addition, we offer articles about adjusting your FPGA design while it’s operating, modifying the Linux kernel to suit your hardware and software designs, tools and techniques to boost your power supply, digital data encoding in wireless systems, GPS orientation of a solar panel, and an interview with Quinn Dunki, an embedded applications consultant and hacker.

The June issue is available for membership download or single-issue purchase.

Places for the IoT Inside Your Home

It’s estimated that by the year 2020, more than 30 billion devices worldwide will be wirelessly connected to the IoT. While the IoT has massive implications for government and industry, individual electronics DIYers have long recognized how projects that enable wireless communication between everyday devices can solve or avert big problems for homeowners.

February CoverOur February issue focusing on Wireless Communications features two such projects, including  Raul Alvarez Torrico’s Home Energy Gateway, which enables users to remotely monitor energy consumption and control household devices (e.g., lights and appliances).

A Digilent chipKIT Max32-based embedded gateway/web server communicates with a single smart power meter and several smart plugs in a home area wireless network. ”The user sees a web interface containing the controls to turn on/off the smart plugs and sees the monitored power consumption data that comes from the smart meter in real time,” Torrico says.

While energy use is one common priority for homeowners, another is protecting property from hidden dangers such as undetected water leaks. Devlin Gualtieri wanted a water alarm system that could integrate several wireless units signaling a single receiver. But he didn’t want to buy one designed to work with expensive home alarm systems charging monthly fees.

In this issue, Gualtieri writes about his wireless water alarm network, which has simple hardware including a Microchip Technology PIC12F675 microcontroller and water conductance sensors (i.e., interdigital electrodes) made out of copper wire wrapped around perforated board.

It’s an inexpensive and efficient approach that can be expanded. “Multiple interdigital sensors can be wired in parallel at a single alarm,” Gualtieri says. A single alarm unit can monitor multiple water sources (e.g., a hot water tank, a clothes washer, and a home heating system boiler).

Also in this issue, columnist George Novacek begins a series on wireless data links. His first article addresses the basic principles of radio communications that can be used in control systems.

Other issue highlights include advice on extending flash memory life; using C language in FPGA design; detecting capacitor dielectric absorption; a Georgia Tech researcher’s essay on the future of inkjet-printed circuitry; and an overview of the hackerspaces and enterprising designs represented at the World Maker Faire in New York.

Editor’s Note: Circuit Cellar‘s February issue will be available online in mid-to-late January for download by members or single-issue purchase by web shop visitors.

Peter Baston Wins the CC Code Challenge (Week 31)

We have a winner of last week’s CC Weekly Code Challenge, sponsored by IAR Systems! We posted a code snippet with an error and challenged the engineering community to find the mistake!

Congratulations to Peter Baston of Flintshire, United Kingdom for winning the CC Weekly Code Challenge for Week 31! Peter will receive a Circuit Cellar 2012 & 2011 Archive CD.

Peter’s correct answer was randomly selected from the pool of responses that correctly identified an error in the code. Peter answered:

Line 35: Should not end with semi-colon

2013_code_challenge_31_answer

You can see the complete list of weekly winners and code challenges here.

What is the CC Weekly Code Challenge?
Each week, Circuit Cellar’s technical editors purposely insert an error in a snippet of code. It could be a semantic error, a syntax error, a design error, a spelling error, or another bug the editors slip in. You are challenged to find the error. Once the submission deadline passes, Circuit Cellar will randomly select one winner from the group of respondents who submit the correct answer.

The CC Weekly Code Challenge ran from June 3rd through December 30th, 2013. Subscribe to our CC.Post newsletter to stay informed of other contests and challenges, as well as recent news, new issue availability, and more!

Gait Boxman Wins the CC Code Challenge (Week 30)

We have a winner of last week’s CC Weekly Code Challenge, sponsored by IAR Systems! We posted a code snippet with an error and challenged the engineering community to find the mistake!

Congratulations to Gait Boxman of Gelderland, Netherlands for winning the CC Weekly Code Challenge for Week 30! Gait will receive an IAR Kickstart: KSK-FM3-48PMC-USB.

Gait’s correct answer was randomly selected from the pool of responses that correctly identified an error in the code. Gait answered:

Line 31: should be digits % 3 instead of digits / 3

2013_code_challenge_30_answer

You can see the complete list of weekly winners and code challenges here.

What is the CC Weekly Code Challenge?
Each week, Circuit Cellar’s technical editors purposely insert an error in a snippet of code. It could be a semantic error, a syntax error, a design error, a spelling error, or another bug the editors slip in. You are challenged to find the error.Once the submission deadline passes, Circuit Cellar will randomly select one winner from the group of respondents who submit the correct answer.

Inspired? Want to try this week’s challenge? Get started!

Submission Deadline: The deadline for each week’s challenge is Sunday, 12 PM EST. Refer to the Rules, Terms & Conditions for information about eligibility and prizes.

Gordon Margulieux Wins the CC Code Challenge (Week 29)

We have a winner of last week’s CC Weekly Code Challenge, sponsored by IAR Systems! We posted a code snippet with an error and challenged the engineering community to find the mistake!

Congratulations to Gordon Margulieux of Oregon, United States for winning the CC Weekly Code Challenge for Week 29! Gordon will receive an Elektor 2012 & 2011 Archive DVD.

Gordon’s correct answer was randomly selected from the pool of responses that correctly identified an error in the code. Gordon answered:

Line 10: Conditional should be “if (number == 0)” instead of number < 0

2013_code_challenge_29_answer

You can see the complete list of weekly winners and code challenges here.

What is the CC Weekly Code Challenge?
Each week, Circuit Cellar’s technical editors purposely insert an error in a snippet of code. It could be a semantic error, a syntax error, a design error, a spelling error, or another bug the editors slip in. You are challenged to find the error.Once the submission deadline passes, Circuit Cellar will randomly select one winner from the group of respondents who submit the correct answer.

Inspired? Want to try this week’s challenge? Get started!

Submission Deadline: The deadline for each week’s challenge is Sunday, 12 PM EST. Refer to the Rules, Terms & Conditions for information about eligibility and prizes.

Alvin Schurman Wins the CC Code Challenge (Week 28)

We have a winner of last week’s CC Weekly Code Challenge, sponsored by IAR Systems! We posted a code snippet with an error and challenged the engineering community to find the mistake!

Congratulations to Alvin Schurman of Florida, United States for winning the CC Weekly Code Challenge for Week 27! Alvin will receive a CC T-Shirt and a one year digital subscription/renewal.

Alvin’s correct answer was randomly selected from the pool of responses that correctly identified an error in the code. Alvin answered:

Line #35: Missing “, terminate()” before “after 0 -> ok” to recursively kill all (both) processes before ending

2013_code_challenge_28_answer

You can see the complete list of weekly winners and code challenges here.

What is the CC Weekly Code Challenge?
Each week, Circuit Cellar’s technical editors purposely insert an error in a snippet of code. It could be a semantic error, a syntax error, a design error, a spelling error, or another bug the editors slip in. You are challenged to find the error.Once the submission deadline passes, Circuit Cellar will randomly select one winner from the group of respondents who submit the correct answer.

Inspired? Want to try this week’s challenge? Get started!

Submission Deadline: The deadline for each week’s challenge is Sunday, 12 PM EST. Refer to the Rules, Terms & Conditions for information about eligibility and prizes.

Brian Shewan Wins the CC Code Challenge (Week 27)

We have a winner of last week’s CC Weekly Code Challenge, sponsored by IAR Systems! We posted a code snippet with an error and challenged the engineering community to find the mistake!

Congratulations to Brian Shewan of Nova Scotia, Canadafor winning the CC Weekly Code Challenge for Week 27! Brian will receive Circuit Cellar 2011 and 2012 Archive CD.

Brian’s correct answer was randomly selected from the pool of responses that correctly identified an error in the code. Brian answered:

Line 22: Shift register won’t shift. Change to “ShiftReg_ClkB <= {ShiftReg_ClkB[1:0], clkA_Change}”

2013_code_challenge_27_answer

You can see the complete list of weekly winners and code challenges here.

What is the CC Weekly Code Challenge?
Each week, Circuit Cellar’s technical editors purposely insert an error in a snippet of code. It could be a semantic error, a syntax error, a design error, a spelling error, or another bug the editors slip in. You are challenged to find the error.Once the submission deadline passes, Circuit Cellar will randomly select one winner from the group of respondents who submit the correct answer.

Inspired? Want to try this week’s challenge? Get started!

Submission Deadline: The deadline for each week’s challenge is Sunday, 12 PM EST. Refer to the Rules, Terms & Conditions for information about eligibility and prizes.