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Six Software Design Tools

Steve Branam November 5, 20211 comment
Contents: Introduction

Here are six tools to help you with software design. The first two are very simple, almost deceptively trivial, while the last four are more involved. They apply universally, to all types of software, all types of systems, and all languages. This is part of good engineering discipline.

At face value, this is just a bunch of acronyms,...


VolksEEG Project: Initial Hardware Architecture

Steve Branam November 2, 20211 comment

The initial hardware architecture for the prototype VolksEEG uses an Adafruit Feather nRF52840 Sense, which connects to a PC via USB for UI (User Interface). Through several additional chips, this provides power to and acquires data from the ADS1299 ADC.

An important topic I mentioned in my introduction to the project is isolation, ensuring there is no conductive path for current through the patient. The architecture is therefore split into...


Introducing The VolksEEG Project

Steve Branam October 31, 2021
Introduction

The VolksEEG project is an open-source project with the goal of creating an electroenchephalogram (EEG) machine, fully cleared by the FDA for standard clinical use. All designs will be freely available for others to manufacture.

The project was founded by Alan Cohen, a medical device systems engineer with an electrical engineering/software (EE/SW) background in Boston, USA, and Dr. Bryan Glezerson


Video-Based STEM Embedded Systems Curriculum, Part 2

Steve Branam October 25, 2021
Contents: Introduction

This post continues from part 1. It contains the first three lesson plans.

Lesson Plan 1: Introducing Arduino

This lesson is first because Arduino is the simplest programming environment, yet allows lots of interaction with hardware. In...


Review: Prototype to Product

Steve Branam October 16, 2021

Prototype to Product: A Practical Guide for Getting to Market, by Alan Cohen, is a must-read for anyone involved in product development, whether in a technical, management, or executive role.

I was reminded of it by Cohen's recent episode on Embedded.fm, 388: Brains Generate EMF, which is worth listening to a couple times through, especially if you're interested in medical device development. And in fact his first episode there, 


The 2021 DSP/ML Online Conference

Stephane Boucher September 29, 2021

The 2021 DSP/ML Online Conference is just around the corner and this year again, the program is packed with opportunities to learn. 

By registering for the conference, not only will you have full access to all talks, workshops, and Q&A sessions at this year's event, but you'll also gain instant access to all talks from last year's edition.  

We've asked the speakers to tell me a few words about their sessions, here are some of the answers we've...


Definite Article: Notes on Traceability

Jason Sachs September 6, 2021

Electronic component distibutor Digi-Key recently announced part tracing for surface-mount components purchased in cut-tape form. This is a big deal, and it’s a feature that is a good example of traceability. Some thing or process that has traceability basically just means that it’s possible to determine an object’s history or provenance: where it came from and what has happened to it since its creation. There are a...


Learning From Engineering Failures

Steve Branam July 29, 2021
Contents: Introduction

I'm an informal student of engineering failures. They guide a lot of my attitude and approach towards engineering.

This is rooted in two of my favorite quotes:

  • George Santayana: Those who do not remember the past are condemned to repeat it.
  • Louis...

Linear Feedback Shift Registers for the Uninitiated, Part XVIII: Primitive Polynomial Generation

Jason Sachs August 6, 20182 comments

Last time we figured out how to reverse-engineer parameters of an unknown CRC computation by providing sample inputs and analyzing the corresponding outputs. One of the things we discovered was that the polynomial \( x^{16} + x^{12} + x^5 + 1 \) used in the 16-bit X.25 CRC is not primitive — which just means that all the nonzero elements in the corresponding quotient ring can’t be generated by powers of \( x \), and therefore the corresponding 16-bit LFSR with taps in bits 0, 5,...


Linear Feedback Shift Registers for the Uninitiated, Part VII: LFSR Implementations, Idiomatic C, and Compiler Explorer

Jason Sachs November 13, 20171 comment

The last four articles were on algorithms used to compute with finite fields and shift registers:

Today we’re going to come back down to earth and show how to implement LFSR updates on a microcontroller. We’ll also talk a little bit about something called “idiomatic C” and a neat online tool for experimenting with the C compiler.


Cracking the (embedded) Coding Interview

Manasi Rajan March 23, 2023

You never forget the day you land your first job. 

The thrill of receiving that call from your recruiter to tell you that you bagged your dream role! The relief when you finally see the offer letter you’ve been working towards for years. The pride in your parents' voices when you call home and say “Hey look Ma, I’ve made it!”

But before that, there’s the grueling screening process to get through. Tech interviews often last up to three months and companies can have five...


Spread the Word and Run a Chance to Win a Bundle of Goodies from Embedded World

Stephane Boucher February 21, 2019

Do you have a Twitter and/or Linkedin account?

If you do, please consider paying close attention for the next few days to the EmbeddedRelated Twitter account and to my personal Linkedin account (feel free to connect).  This is where I will be posting lots of updates about how the EmbeddedRelated.tv live streaming experience is going at Embedded World.

The most successful this live broadcasting experience will be, the better the chances that I will be able to do it...


Interfacing LINUX with microcontrollers

Fabien Le Mentec May 7, 20132 comments
Introduction

I am increasingly asked to work on small spare time projects where a user needs to control some device over the INTERNET. Recently, a friend needed to control heater relays and measure the temperature of its geographically distant secondary house. Another case relates to the control of a pan tilt home monitoring camera. A last one is the control of an old XY plotter DACs.

In both applications, the user wants to access the system over a web browser using HTTP. From the user...


Tolerance Analysis

Jason Sachs May 31, 2020

Today we’re going to talk about tolerance analysis. This is a topic that I have danced around in several previous articles, but never really touched upon in its own right. The closest I’ve come is Margin Call, where I discussed several different techniques of determining design margin, and ran through some calculations to justify that it was safe to allow a certain amount of current through an IRFP260N MOSFET.

Tolerance analysis...


PC and SP for a small CPU

Victor Yurkovsky July 23, 2013

Ok, let's make a small stack-based CPU.

I will start where the rubber meets the road - the PC/stack subsystem that I like referring to as the 'legs'. As usual, I will present a design with a twist.

Not having a large design team, deadlines and million-dollar fab runs when designing CPUs creates a truly different environment. I can actually sit at the kitchen table and doodle around with CPU designs to my heart's content. I can try really ridiculous approaches, and work without a...


How to Include MathJax Equations in SVG With Less Than 100 Lines of JavaScript!

Jason Sachs May 23, 20149 comments

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 feedback control systems:

And I had a problem. How do I draw diagrams like this?

I don’t have Visio and I don’t like Visio. I used to like Visio. But then it got Microsofted.

I can use MATLAB and Simulink, which are great for drawing block diagrams. Normally you use them to create a...


How to Give Persistent Names To USB-Serial Devices on Ubuntu 14.04

Tayyar GUZEL May 22, 2017

If you have a bunch of USB-serial devices connected to your dock station and you needed to bind your USB-serial devices under static names so that all the USB-serial devices don't get to be assigned to random names by "udev" manager when you re-plug your laptop to the dock station, follow the instructions below. I will share the udev rules I created as a reference and give the step by step instructions to achieve persistent naming. All the steps worked on my Ubuntu 14.04...


Levitating Globe Teardown, Part 1

Tim Wescott November 4, 20133 comments

I've been kicking some ideas around for a long time for a simple and inexpensive platform I could use for control systems experimentation for the beginner.  I want something that can be controlled easily in a basic fashion, yet that provides some depth: I want to be able to present ever-more challenging goals to the student, that can be attained by fancier control algorithms all on the same device.

I'm currently looking at magnetic levitation.  It's fun, it has the potential to be...