It sometimes seems as though antennas and RF design are portrayed as something of a Black Art, the exclusive preserve of an initiated group of RF mystics and beyond the reach of mere mortals. In fact though they have their difficult moments it’s possible to gain an understanding of the topic, and making that start is the subject of a video from [Andreas Spiess]. Entitled “How To Build A Good Antenna”, it uses the design and set-up of a simple quarter-wave groundplane antenna as a handle to introduce the viewer to the key topics.
I thought many would be interested in the development status and new features of pre-v6/post-v5 now when 5.1.0 has been released and version 6 development has begun. Add your favorite here if someone else hasn’t done it already.
I wanted to use an Adafruit AMG8833 thermal camera feather wing with the mini color TFT feather wing. Stacking them together with a Feather doubler board works fine (and the AMG8833 data looks very nice on the tiny screen!) but the problem is that the thermal camera is looking in the same direction as the screen. When you look at the screen all you see is…. you!
Hackaday has among its staff a significant number of writers who also hold amateur radio licenses. We’re hardware folks at heart, so we like our radios homebrew, and we’re never happier than when we’re working at high frequencies.
Amateur radio is a multi-faceted hobby, there’s just so much that’s incredibly interesting about it. It’s a shame then that as a community we sometimes get bogged down with negativity when debating the minutia. So today let’s talk about a few of my favourite things about the hobby of amateur radio. I hope that you’ll find them interesting and entertaining, and in turn share your own favorite things in the comments below.
It’s compatible with Octoprint Octolapse plugin which means that you can use a high end DSLR to create beautiful time lapses of 3D prints magically growing out of your printer bed. Also on the product page there are example python scripts that enable quick setup for high quality time lapse. We note that although it’s sold as a Raspberry Pi interface, this device is happy with a 3.3V or 5V input and that it could be triggered by most micro controllers. If you have a Sony, Canon or Nikon DSLR then this should work out of the box, for other DSLR you might need an audio adaptor to get up and running.
Welcome back to the second of our three part bonus season of On the Metal: episodes that we recorded after the end of Season 1 but before the onset of the pandemic.
On this episode of On the Metal, we interview Star Simpson, autonomous aviation visionary, insatiably curious engineer, and relentless optimizer. Join us as we learn how a pirated C++ compiler at an impressionable age pushed Star towards electronics, how a friend jockeying for Hacker News karma landed her work on late-night TV — and why you definitely didn’t want to be test pilot on the Piasecki PA-97. And if you find yourself hankering for a good read, you’re in luck: this episode ends with a flurry of book recommendations sure to sate your inner aviation buff.
The Open Hardware Summit (OHS) invites talk proposals for the eleventh annual summit! This year’s summit is virtual and will be held online on Friday 2021-04-09, 9:00 AM – 5:30 PM EDT.
The Open Hardware Summit is for presenting, discussing, and learning about open hardware of all kinds. The summit examines open hardware applications, practices, and theory, ranging from environmental sensors to 3D printable medical devices to open hardware processors and beyond. We are interested in open hardware on its own as well as in relation to topics such as software, design, business, law, and education. Past talks have featured topics such as advances in space propulsion, humanitarian projects, right to repair legislation, open hardware in education, and open hardware marketing.
For our eleventh edition we are especially looking for speakers who can offer insights around the role of open hardware in the COVID-19 pandemic, open hardware medical devices, and related topics.
We invite talk proposals from individuals and groups. Submissions are due by Thursday 2021-02-11 at 11 PM EDT.
In the last Circuit VR we looked at some basic op amp circuits in a simulator, including the non-inverting amplifier. Sometimes you want an amplifier that inverts the signal. That is a 5V input results in a -5V output (or -10V if the amplifier has a gain of 2). This corresponds to a 180 degree phase shift which can be useful in amplifiers, filters, and other circuits. Let’s take a look at an example circuit simulated with falstad.
Last time I mentioned two made up rules that are good shortcuts for analyzing op amp circuits…
Increasing government attention to “open” agendas, complemented by growing community capacity, have laid the groundwork for driving policy attention towards open hardware. The COVID-19 pandemic spotlighted the ability of open hardware communities to mobilize for disaster response, including through the design and production of personal protective equipment (PPE) and other medical supplies when traditional supply chains failed. A new Administration offers an opportunity to build on lessons learned from this unforeseen and extensive experiment in scaling open collaboration on hardware and also to revisit what has worked in the past for related fields such as community science and open source software. A whole-of-government approach to elevating open hardware, including for scientific research and disaster response, feels both timely and necessary in order to amplify effective activities and provide scaffolding for an even more impactful future.
To better understand potential opportunities, researchers and practitioners from the Wilson Center, Open Environmental Data Project, and University of Cambridge convened a workshop on October 28, 2020 to bring together members of the open hardware community, such as those involved in GOSH and OSHWA. Beginning with the question What are you most excited about in open science hardware right now, the workshop focused on establishing a value proposition for open hardware as a matter of public policy as well as elucidating open challenges that might be addressed by policy interventions. One goal of the workshop was to develop high-level consensus around “key messages,” for policy makers and a list of eleven suggestions was subsequently ranked by participants. This exercise made it clear that to refine these further, more work was needed to understand specific accelerators and barriers to the adoption and use of open hardware, and to align perspectives between the policy community and diverse developers and users of open hardware from academia, industry and community organisations operating across a broad range of disciplines.