Metal detection: building the detector

Fabien Le Mentec February 6, 20162 comments
IntroductionBefore starting, you may want to read this post describing the BFO stage:

//www.embeddedrelated.com/showarticle/911.php

I have detailed the implementation of a BFO stage for detecting metal. Now it has been validated on the bench, the next step is to integrate it in a stand alone instrument for testing on the field. A few things have to be done to reach this goal:

  • make a PCB for the electronics,
  • house the PCB in a box,
  • add a power supply,
  • make a frame to hold...

Basic hand tools for electronics assembly

Ed Nutter November 20, 20153 comments

Though the software tools vary with different microcontrollers, many hardware tools are the same.

If you are working on larger robotic or automotive systems, you will need a 3/8" and 1/2" drive socket set. There are occasions when even larger drive socket sets are needed. For small robots and taking things apart, the 1/4" drive socket set is useful. The sizes usually range from 5/32" to 9/16" and 4mm to 15mm.  You will need both shallow and deep sockets, both standard and...


Improving the Reload2 active load

Fabien Le Mentec April 23, 2015
Introduction

With another colleague at work, we are currently developing an electronic board that will eventually be powered over Ethernet. To gain more experience with this technology, we prototyped a standalone power supply stage.

We want to test this stage with different load profiles. While we already have professional grade active loads at work, I had previously read about the Reload2 product from Arachnidlabs, a low cost active load sold on Hackaday:


OOKLONE: a cheap RF 433.92MHz OOK frame cloner

Fabien Le Mentec August 12, 201417 comments
Introduction

A few weeks ago, I bought a set of cheap wireless outlets and reimplemented the protocol for further inclusion in a domotics platform. I wrote a post about it here:

//www.embeddedrelated.com/showarticle/620.php

Following that, I had access to another outlet from a different vendor:

http://www.castorama.fr/store/Prise-telecommandee-BLYSS---Interieur-prod4470027.html

The device documentation mentions that it operates on the same frequency as the previous...


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

Dr Cagri Tanriover July 5, 2014

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 meeting this requirement.

Under normal circumstances, one can put all the electronics within an IP65 enclosure that is affordable and readily available off-the-shelf most of the time such as the ones shown in this link. However, given the humidity and the pressure sensor need to be exposed to...


A wireless door monitor based on the BANO framework

Fabien Le Mentec June 10, 20145 comments
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 remote place. A typical situation is when I leave for holidays, but it can also be useful from the work office. To do so, I would centralize the information on a server connected on the Internet that I could query using a web browser. The server itself would be located in the appartement, where...


Using the Beaglebone PRU to achieve realtime at low cost

Fabien Le Mentec April 25, 20148 comments
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 platform: a BeagleBone Black (BBB) running Linux. I had already worked with this board in the past, and I found it very interesting given its excellent resources versus price ratio (around 40 euros). This time, I was impressed by its realtime capabilities. I thought it would be a good idea to...


A simple working I2C (TWI) level shifter

Dr Cagri Tanriover July 16, 20132 comments

Recently, I had to interface two hardware platforms via an I2C bus (a.k.a. two-wire interface, TWI) to query temperature and real-time clock information. This task is relatively straightforward on the software side. However, because the power supply of the two platforms were different (one at 3.3V and the other at 5V), the I2C busses could not be connected to one another directly and a level shifter was required between them.

 There are commercially available I2C level shifters such as...


Requirements, Specifications and Tests

Kenny Millar June 20, 2013

As a freelance developer of all things embedded, it's important that right through a project everyone involved knows what is expected, who is responsible for delivering, and how to confirm that what is delivered meets the customers expectations.

I have a tried and trusted method that works for me each time, is flexible enough to deal with feature-creep and solid enough to give the client that warm fuzzy fealing that they crave.

I've dound that this method of working has in the past been...


Layout recomendations and tips for best performance against EMC

Dr. Maykel Alonso January 4, 2013

When making the layout of the circuit diagram, it is interesting to perform a preliminary analysis of several issues in order to minimize problems arising from electromagnetic compatibility.The analysis consists in:

Identify / Analyze components: This section will analyze the integrated components, as well as any recommendations it may have the manufacturer. We must also analyze the encapsulation possibilities which have the component.


Using the Beaglebone PRU to achieve realtime at low cost

Fabien Le Mentec April 25, 20148 comments
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 platform: a BeagleBone Black (BBB) running Linux. I had already worked with this board in the past, and I found it very interesting given its excellent resources versus price ratio (around 40 euros). This time, I was impressed by its realtime capabilities. I thought it would be a good idea to...


VHDL tutorial - A practical example - part 3 - VHDL testbench

Gene Breniman June 26, 20116 comments

In part 1 (//www.embeddedrelated.com/showarticle/85.php) of this series we focused on the hardware design, including some of the VHDL definitions of the I/O characteristics of the CPLD part.  In part 2 (//www.embeddedrelated.com/showarticle/87.php), we described the VHDL logic of the CPLD for this design.  In part 3, we will show the entire VHDL design and the associated tests used to prove that we have, in fact, designed what we started out to...


VHDL tutorial - A practical example - part 2 - VHDL coding

Gene Breniman May 27, 2011

In part 1 of this series we focused on the hardware design, including some of the VHDL definitions of the I/O characteristics of the CPLD part.  In part 2, we will describe the VHDL logic of the CPLD for this design.

With any design, the first step to gather the requirements for the job at hand.  From part 1 of this article, I have copied two sections that address some of the requirements for the CPLD design.

The data acquisition engine has the...


VHDL tutorial - A practical example - part 1 - Hardware

Gene Breniman May 18, 20111 comment

In previous posts I described some simple VHDL examples.  This time let's try something a little more complex. This is part one of a multiple part article.  This is intended to be a detailed description of one of several initial designs that I developed for a client.  This design never made it into a product, but a similar design was used and is currently being produced.  As a considerable amount of work was put into this effort, I decided to share this design...


OOKLONE: a cheap RF 433.92MHz OOK frame cloner

Fabien Le Mentec August 12, 201417 comments
Introduction

A few weeks ago, I bought a set of cheap wireless outlets and reimplemented the protocol for further inclusion in a domotics platform. I wrote a post about it here:

//www.embeddedrelated.com/showarticle/620.php

Following that, I had access to another outlet from a different vendor:

http://www.castorama.fr/store/Prise-telecommandee-BLYSS---Interieur-prod4470027.html

The device documentation mentions that it operates on the same frequency as the previous...


A wireless door monitor based on the BANO framework

Fabien Le Mentec June 10, 20145 comments
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 remote place. A typical situation is when I leave for holidays, but it can also be useful from the work office. To do so, I would centralize the information on a server connected on the Internet that I could query using a web browser. The server itself would be located in the appartement, where...


Basic hand tools for electronics assembly

Ed Nutter November 20, 20153 comments

Though the software tools vary with different microcontrollers, many hardware tools are the same.

If you are working on larger robotic or automotive systems, you will need a 3/8" and 1/2" drive socket set. There are occasions when even larger drive socket sets are needed. For small robots and taking things apart, the 1/4" drive socket set is useful. The sizes usually range from 5/32" to 9/16" and 4mm to 15mm.  You will need both shallow and deep sockets, both standard and...


Using XML to describe embedded devices (and speak to them)

Martin Strubel October 12, 20111 comment

This article discusses one of the typical development cycles in embedded device and communication design and presents a possible, light weight solution using the free DClib/netpp framework.

The challenge

Assume we're faced with the design of an embedded device, be it a simple SoC unit or a more complex, uC controlled engine with various attached peripherals. From first prototype to the market, the following development cycle is typically walked through:


Improving the Reload2 active load

Fabien Le Mentec April 23, 2015
Introduction

With another colleague at work, we are currently developing an electronic board that will eventually be powered over Ethernet. To gain more experience with this technology, we prototyped a standalone power supply stage.

We want to test this stage with different load profiles. While we already have professional grade active loads at work, I had previously read about the Reload2 product from Arachnidlabs, a low cost active load sold on Hackaday:


First Steps in OrCAD 16 [Capture]

Dr. Maykel Alonso June 1, 20127 comments

Hello community, I know that in last posts I have been writting about the Software. But what about Hardware? In last months I have been dealing with it, exactly with OrCAD 16. And I will explain how to build a PCB  in 2 articles. For begginers could be a good and easy guide.

This article explains the part for the designing of the schematic, and in the next one which i will explain the layout part.

The first stuff you must known about OrCAD is that it is not an unique tool for...