Blog

Low Battery Warning Indicator

shabaz

IntroductionI like building battery-powered circuits, but always in the back of my mind is the thought that I really ought to provide a ‘low-battery’ indication! Since it isn’t usually a core feature of the project, it often gets forgotten. This ultr...
- 22 Sep 2020
ARMP - (Nearly) Complete Schematics

michaelkellett

I had hoped to to have completed the basic design by now but I've spent a lot of today thinking aboutpower supplies, but not getting quite far enough to commit to paper (or CAD).The idea was always to have a a separate power conversion board, so ...
- 23 Aug 2020
ARMP Processor and Display

michaelkellett

15/08/2020This is still very much work in progress. I've confirmed my primary choice of display, the Riverdi RVT43ALBFWN00, available from Mouser and RS.It has an SPI interface over a 20 way FPC and uses a Bridgetek controller chip. This is ...
- 15 Aug 2020
ARMP ADC, DAC and FPGA

michaelkellett

Overview Once again there are few (if any) component vlaues on the schematic, these will appear in the BOM later on.Treat the pin numbering on the FPFA with caution, I shall swap pins as appropriate when I layout the board. The Detail...
- 7 Aug 2020
Open Source Hand Sanitizer Dispenser Device with Acrylic Enclosure [Pro Version]

Hesam.M

FeaturesHigh stability and no sensitivity to the ambient lightLaser-cut acrylic (plexiglass) enclosureCost-effectiveFlow control capability of the hand-sanitizer/alcohol (efficiency)Through-hole components (easy to solder)Single-layer PCB board (easy...
- 7 Aug 2020
ARMP Input Amplifier

michaelkellett

This is my first stab at the input amplifier for the Archaeology Resistance Meter Project.It's tagged as armp OverviewThe schematic has (almost) no component values but I shall talk about them in the text.All two terminal components are in 0...
- 29 Jul 2020
Meter Dial Creator Toolkit

shabaz

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 ar...
- 10 Apr 2020
Engineers, Makers, and Citizen Scientist Team Up On Facebook To Create Open Source Medical Supplies To Fight Global Pandemics

CharlesGantt

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 Scienti...
- 16 Mar 2020
Microphone Amplifier for Micro-controllers

shabaz

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 ...
- 14 Mar 2020
Building a Dual Thermistor Air Temperature Sensor

shabaz

Introduction How does it work? Building a Temperature Sensor Summary IntroductionThis blog post describes a really simple (near-trivial) project – wiring up a thermistor! Thermistors are great, but have a limited operational temper...
- 8 Feb 2020
Free Chemistry, Heating and LoRa stuff [UK]

shabaz

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...
- 2 Sep 2019
Building an LCR Meter

shabaz

IntroductionRecently 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 Capac...
- 23 Jul 2019
Kelvin (4-Wire) Milliohm Meter: Version 1.3 Enclosure

fmilburn

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 ...
- 30 May 2019
Creating Product Links in a Blog Post, using EAGLE

shabaz

IntroductionFor 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 201...
- 14 May 2019
Building a Low Cost Solder Fume Extractor - Part 2

shabaz

Note: This is part 2 of a two-part project.For first part, see here: Building a Low Cost Solder Fume Extractor – Part 1 IntroductionThis project concerns a solder fume extractor that does as the title suggests, and sucks up solder fumes from so...
- 31 Mar 2019
Kelvin (4-Wire) Milliohm Meter: Version 1.3 Working

fmilburn

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 contain...
- 7 Mar 2019
S7-Mini - Spartan7 open source board

gecoz

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, hi...
- 28 Feb 2019
Another BeagleBone - BeagleBone AI!

shabaz

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 ne...
- 27 Feb 2019
Kelvin (4-Wire) Milliohm Meter: Version 1.3

fmilburn

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 upgrade...
- 24 Jan 2019
Building Frank's Milliohm Meter

shabaz

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! I...
- 2 Jan 2019
Making Fancy Cables Part 2: Soft Headphone and Composite Cables

shabaz

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 expan...
- 8 Dec 2018
Making Mini-Circuits style Tiny Metal Boxes - RF Module Enclosures

shabaz

IntroductionThere 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 pe...
- 7 Dec 2018
The Audio Cable Buddy - Boosting Audio via Impedance Conversion

shabaz

IntroductionI'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 t...
- 21 Nov 2018
Making Fancy Cables: Network Cables!

shabaz

(This is part 1. For part 2, see here! Making Fancy Cables Part 2: Soft Headphone and Composite Cables ) IntroductionThis very short blog post describes the steps I took to make network patch cables that I think are slightly nicer-looking ...
- 14 Nov 2018
Wall mount touchscreen for ESP32 and ESP8266

hwhardsoft

Hi,I want to introduce a project of me. It's a enclosure set with in-build touchscreen for top wall mounting for ESP32 and ESP8266 modules. This kit enables you to mount your project permanent in your living room, corridor or other exposed places...
- 29 Oct 2018