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Someday We’ll Find It, The Kelvin Connection

You’d think it wouldn’t be too hard to measure electrical resistance accurately. And it’s really not, at least according to you just follow these easy steps: Choose t...

posted by Jason Sachs on Jul 28 2014 under Circuit Design | Measurement 
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Reverse engineering wireless wall outlets

Introduction I am improving the domotics framework that I described in a previous article: I want to support wireless wall outlets, allowing me to s...

posted by Fabien Le Mentec on Jul 19 2014 under Software Development | Communications | Microcontroller 
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Short Circuit Execution vs. Unit Testing

The key to effective communication is to say what you mean and avoid ambiguity.  Words and phrases with multiple meanings can confuse your audience and hinder communication. That’s why so m...

posted by Stephen Friederichs on Jul 7 2014 under Tools | Software Development | Debugging 
Comments (2) |

Practical protection against dust and water (i.e. IP protection)

Recently, I was faced with a challenge to provide IP65 compliance in a product that had to have humidity and pressure sensors on it. The tricky part was to keep the cost of the unit under $15 while me...

posted by Dr Cagri Tanriover on Jul 5 2014 under Miscellaneous | Hardware Development | Sensors | System Design 
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10 Items of Test Equipment You Should Know

When life gets rough and a circuit board is letting you down, it’s time to turn to test equipment. The obvious ones are multimeters and oscilloscopes and power supplies. But you know about those...

posted by Jason Sachs on Jun 22 2014 under Tools | Test Equipment 
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A wireless door monitor based on the BANO framework

Introduction I have been thinking for a while about a system to monitor the states of my flat and my garage doors from a remote place. Functionnaly, I wanted to monitor the state of my doors from a r...

posted by Fabien Le Mentec on Jun 10 2014 under Software Development | Hardware Development | Microcontroller 
Comments (5) |

Specifying the Maximum Amplifier Noise When Driving an ADC

I recently learned an interesting rule of thumb regarding the use of an amplifier to drive the input of an analog to digital converter (ADC). The rule of thumb describes how to specify the maximum all...

posted by Rick Lyons on Jun 9 2014
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Using the C language to program the am335x PRU

Introduction Some weeks ago, I published an article on how we used the PRU to implement a power supply control loop having hard realtime constraints:

posted by Fabien Le Mentec on Jun 7 2014 under Software Development | Linux 
Comments (19) |

Musings on Publication — and Zero Sequence Modulation

Perhaps you don’t think about it, but in order for you to read these articles, someone has to do something. And I don’t just mean writing them. Stephane Boucher has set up this website so...

posted by Jason Sachs on May 30 2014 under Miscellaneous | Power Electronics 
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How to make a heap profiler

We'll see how to make a heap profiler. Example code for this post makes up heapprof, a working 250-line heap profiler for programs using malloc/free. It works out of the box on Linux (tested on "real...

posted by Yossi Kreinin on May 23 2014 under Tools | Software Development | Tutorials 
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How to Include MathJax Equations in SVG With Less Than 100 Lines of JavaScript!

Today’s short and tangential note is an account of how I dug myself out of Documentation Despair. I’ve been working on some block diagrams. You know, this sort of thing, to describe feedba...

posted by Jason Sachs on May 23 2014 under Tools | Miscellaneous 
Comments (2) |

Vintage robotics!

The town we live in had it's yearly Spring Fesitval last weekend.  There are vendor booths, food, rides, etc - it's a fun event put on by the town.  The town shuts main street down each year...

posted by Lonnie Honeycutt on May 4 2014 under Power Supply | Control Systems 
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First-Order Systems: The Happy Family

Все счастли́вые се́мьи похо́жи друг на дру́га, ка́ждая несчастли́вая семья́ несчастли́ва по-сво́ему. — Л...

posted by Jason Sachs on May 3 2014 under Control Systems | Signal Processing 
Comments (1) |

Lost Secrets of the H-Bridge, Part IV: DC Link Decoupling and Why Electrolytic Capacitors Are Not Enough

Those of you who read my earlier articles about H-bridges, and followed them closely, have noticed there's some unfinished business. Well, here it is. Just so you know, I've been nervous about writing...

posted by Jason Sachs on Apr 29 2014 under Tutorials | Circuit Design | Power Electronics 
Comments (7) |

Using the Beaglebone PRU to achieve realtime at low cost

Introduction I work as an engineer in a synchrotron facility. A few weeks ago, I helped the people in charge of the power supply developments to integrate a realtime control algorithm on a prototype ...

posted by Fabien Le Mentec on Apr 25 2014 under ARM | RTOS | Software Development | Linux | Hardware Development 
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Ada 2012 Comes to ARM Cortex M3/M4

Ada, that old dinosaur?  I thought Ada was dead! Admit it, at least a few of you had that thought, right?  Well, far from being dead, the Ada language has been evolving, improving, and help...

posted by Michael Silva on Apr 25 2014
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April is Oscilloscope Month: In Which We Discover Agilent Offers Us a Happy Deal and a Sad Name

Last month I wrote that March is Oscilloscope Month, because Agilent had a deal on the MSOX2000 and MSOX3000 series scopes offering higher bandwidth at lower prices. I got an MSOX3034 oscilloscope and...

posted by Jason Sachs on Apr 19 2014 under Test Equipment 
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How to Analyze a Differential Amplifier

There are a handful of things that you just have to know if you do any decent amount of electronic circuit design work. One of them is a voltage divider. Another is the behavior of an RC filter. I'm...

posted by Jason Sachs on Apr 13 2014 under Circuit Design | Analog Circuits 
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Garden Rakes Revisited: The Hall of Shame

A little while ago, I wrote about what I call the "garden rakes" syndrome in software, where there are little bugs or pitfalls lying around like sloppy garden rakes that no one has put away, and when ...

posted by Jason Sachs on Apr 12 2014 under Miscellaneous 
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Little to no benefit from C based HLS

As I write this I am on a plane and my destination is EELive 2014 where I am going to give a talk hardware design: the grunge era.  It is a shotgun introduction to three alternative hardware desc...

posted by Christopher Felton on Apr 4 2014
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