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Open Source Hardware

34 Posts authored by: shabaz Top Member
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 ...
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   ...
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 ...
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 ...
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 ...
Introduction There are some really nice small enclosures that are incorporated into products sold by Mini-Circuits and others. They are very cool because their surfaces are perfectly perpendicular to each other, with no draft angle. This makes them perfect for joining modules together a bit like plumbing, and quick and easy connector alignment.   I didn’t know of any low-cost source of them (I could find low-cost angled sides, and really expensive ones with perpendicular sides but no ...
Introduction I've often heard the issue that the audio isn't loud enough when people plug in their iPods/phones and so on into music systems, even if they turn the volume up to maximum on their device or the amplifier.   Often the problem is down to the fact that the 3.5mm plug is being used for two different roles. On the iPod/phone the plug is being used to carry a headphone output signal. But on the music system, the socket is used to accept a line level signal.   Headphones have ...
(This is part 1. For part 2, see here! Making Fancy Cables Part 2: Soft Headphone and Composite Cables  )   Introduction This very short blog post describes the steps I took to make network patch cables that I think are slightly nicer-looking than normal. Such a thing is subjective of course. Why would anyone want to do this? Well, sometimes I need to do presentations or demonstrations, and the ugly messy wires at the back can become a lot more attractive this way! Also, I happened to ...
Introduction Background to the Project Hardware Overview What Functionality is Implemented? Using It What Performance does it have? How to make it? Morpheus Main Board FRDM Board Software Setting up and using mbed-cli TFT Screen Summary Appendix: PCB Renders Issues Tracking Revision 1 PCB Attachments     Introduction Sometimes it is interesting to make test equipment, even if it can’t replace commercial products. ...
Introduction This blog post discusses some practical implementations of super-low-cost ($30 upward) direct digital synthesis (DDS) based signal generator for home use. To save effort and time, they can all be built around an off-the-shelf microcontroller board, and an off-the-shelf direct digital synthesis (DDS) board. There are several different ideas discussed in this blog post, and all are similar – the principles are exactly the same, just that frequency range and desired control/mo ...

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