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Open Source Hardware

86 posts
Introduction Overview Using the Code Settings Section Functions Section Main Code Section Putting it all Together Summary   Introduction For a recent environment sensor project I wanted to make use of an analog moving-coil meter. They are still manufactured and available new from Aliexpress for very little, and are also available from what I’ve heard, from Ham radio meet-ups.   They can be driven from analog circuits, or from microcontrollers and ...
I've been covering the engineering and maker communities for over a decade now, and it never ceases to amaze me when these communities come together to solve complex issues. Take for example the E-Nable Project. Engineers, Makers, and Citizen Scientists teamed up to create open-source, 3D printable prosthetics for children that anyone with a 3D printer and basic tools could create. Likewise, a new group on Facebook has been created to bring those same groups together to collaborate on designing ...
The blog post here is just a place to put files and diagrams related to an electret microphone element amplifier circuit that is intended for basic sound or speech applications. The circuit is based on requirements from  BigG  and analysis from michaelkellett. It was created as part of a discussion in the comments here: https://www.element14.com/community/message/289305/l/trying-to-understand-how-r-c-affect-an-audio-signal-when-used-in-a-… That discussion can be referred to, ...
Introduction How does it work? Building a Temperature Sensor Summary   Introduction This blog post describes a really simple (near-trivial) project – wiring up a thermistor!   Thermistors are great, but have a limited operational temperature range compared to (say) thermocouples. The aim was to use a thermistor for fast, accurate ambient temperature measurement because this is handy for checking the room for those who are slightly obsessive over their environment ...
Hi, I've got some items unrequired, if you're in the UK and wish to have it, please let me know if you want "chemistry" or "LoRa" or "Heating" stuff and I'll post it for free. All of this stuff is new and unused, and I hate to just throw it away since it's quite useful stuff.   Chemistry stuff: 6 x 100ml beakers (glass), a plastic funnel, 4 glass pipettes and some boxes of universal indicator (like Litmus paper).     LoRa stuff: Two SX1276MB1MAS (European variant) LoRa transc ...
shabaz

Building an LCR Meter

Posted by shabaz Top Member Jul 23, 2019
Introduction Recently there's been lots of interest in capacitor equivalent series resistance (ESR) and many other capacitor topics (e.g. see Deep Dive into ESR, Introduction  and Capacitor Leakage Experiments and Experimenting with Polymer Capacitors ). This blog post briefly discusses how to build a tool that can attach to a PC, in order to measure the impedance of components. For a brief overview of impedance, and why it can be important, see Measuring Capacitor Characteristics   ...
This post documents an enclosure for the milliohm meter described here and is a tale of how the mechanical bits are often as difficult to get right as the electronics.  The meter parts have been stored away, and thus it was not really available due to the lack of an enclosure.  Today I finally got around to putting it all together.   Here it is all wired up but outside of the enclosure: I am not that pleased with the wiring - too easy to bump loose and not that tidy - but easy ...
Introduction For open source projects, I usually create a table containing the parts details or bill of materials (BoM), but it is tiresome to then re-enter all that information into the Farnell or Newark website, to order the bits.   The March 2019 update to the element14 website contains the ability to paste BoM content and it will auto-convert into a nice table with hyperlinked buttons to go directly to the Farnell/Newark product page for each component, or a single-button to purchase a ...
Note: This is part 2 of a two-part project. For first part, see here: Building a Low Cost Solder Fume Extractor – Part 1   Introduction This project concerns a solder fume extractor that does as the title suggests, and sucks up solder fumes from soldering irons : ) It consists of a box containing multiple fans and filters, and a hose attachment with a funnel on the ingress side, and an egress side with the control/connectors. There is also an 'Aux' port, for additions such as LED la ...
This post documents the first working Version 1.3 of an inexpensive but reasonably accurate meter for measuring resistance in the milliohm range. The development to date is documented in the links at the bottom of this post.  Version 1.3 contains numerous upgrades and suggestions from Shabaz, Gene Breniman, John Wiltrout, and Jon Clift to which I am indebted.   It's Alive! Those who were following the project may have given up it has been so long since the last post.  The reas ...
Looks like there is a new Xilinx Spartan7 board on the market!       The S7-Mini board has been officially launched at Embedded World 2019, by Trentz Electronic, a German company specialized in the design of high-speed data acquisition, high-accuracy measurement and embedded digital signal processing systems based on FPGA and CPU architectures.   The design of the prototype board comes from last year collaboration between  Black Mesa Lab and OSH Park, which is now ...
Hopefully we'll hear more soon, but there appears to be another BeagleBone board launched at Embedded World, with the same form-factor as the BeagleBone Black. It's called the BeagleBone AI. I'm guessing it's not a replacement and won't be anywhere near as cost-reduced as the BBB and its variants (for example there is 16GB of eMMC on-board on the BB-AI), the board looks very useful for working with image recognition or other video processing. (Photo from the Beagleboard website, will replace w ...
This post documents Version 1.3 of an inexpensive but reasonably accurate meter for measuring resistance in the milliohm range. The development to date is documented in the links at the bottom of this post.  Version 1.3 contains numerous upgrades and suggestions from Shabaz, Gene Breniman, John Wiltrout, and Jon Clift to which I am indebted.  I intend to send off for new PCBs tomorrow evening and any comments in the meantime are greatly appreciated!  NOTE: This post was revised on ...
Introduction This short blog post documents the specific component values and any mods done to the revision 1 PCB from fmilburn Working Prototype of a Kelvin (4-Wire) Milliohm Meter  Project14  Test Instrumentation entry! It is a project intended to create a 4-wire measurement meter for 0-4 ohm and 0-40 ohm ranges, with sub-milliohm granularity.   It is a physically small test instrument, but works well! In very limited tests, the typical discrepancy between a calibrated commerc ...
Part 1, Making Fancy Cables: Network Cables!  examined how coloured and patterned nylon braids could be used for cable assembles: ) Those cables are intended for demos/presentations and so on. Nylon braid is very easy to use because it can expand a lot, and is slippery against the wire so it slides on well too. However, although it looks visually nice, it is not soft. For home use, maybe a softer braiding is preferred.   For a long time I have wondered how to create composite cable ...

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