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COVID Green Pass Validator with Raspberry Pi

It seems like every nation is dealing with the plague a little differently. In June, the EU instated a COVID Green Pass which comes in the form of a paper or digital QR code. It was designed to grease the wheels of travel throughout Europe and allow access to nursing homes. As of early August, the Green Pass is now required of those 12 and older in...

The Simplest FT8 Transceiver You’ll Ever Build

Probably the most interesting facets of amateur radio in 2021 lie in the realm of digital modes. Using the limitless possibilities of software defined radios has freed digital radio communication from the limits of what could be done with analogue electronics alone, and as a result this is a rare field in which radio amateurs can still be ahead of the...

Making Linux Offline Voice Recognition Easier

For just about any task you care to name, a Linux-based desktop computer can get the job done using applications that rival or exceed those found on other platforms. However, that doesn’t mean it’s always easy to get it working, and speech recognition is just one of those difficult setups. A project called Voice2JSON is trying to simplify the use of...

Design and Build Your Own Circular Slide Rule

You have to really like slide rules to build your own, including the necessary artwork. Apparently [Dylan Thinnes] is a big fan, based on this project he began working on a few months back. The result is a set of algorithms that automatically generates most of the scales that were common on slide rules back in the day. For example: K Cubic scale,...

A Promising Start for the Doritos Space Program

Rocketry is tricky stuff, but as long as you’re not trying to get into space, the whole idea can basically be boiled down into a simple concept: if you put enough thrust behind it, anything can fly. At least, for awhile. It’s this basic premise that allows what hobbyists sometimes refer to as “Odd-Rocs” fly; these unusual objects might not be ideal...

Embrace the New, But Don’t Forget the Old

We were trading stories of our first self-made PCBs in the secret underground Hackaday bunker, and a couple of the boards looked really good for first efforts. Of course there were mistakes and sub-optimal routing, but who among us never connects up the wrong signals or uses a bad footprint? What lead me to have a hacker “kids these days have it so...

Tiny BEAM Robot Smiles Big at the Sun

What have you been working on during the Great Chip Shortage? [NanoRobotGeek] has been living up to their handle and building BEAM robots that are smaller than any we’ve seen before. What are BEAM robots, you say? Technically it stands for Biology Electronics Aesthetics and Mechanics, but basically the idea is to mimic the movement of bugs, usually...

A Toy Jeep For After The Apocalypse

When your friends are off to the post-apocalyptic Wasteland Festival and present you with a defunct Power Wheels clone toy Jeep to make ready for the festivities, what are you to do? If you happen to be [Victor Frost], soup it up with new electrics and uprated steering, and send it forth into the hideous no-mans land. These toys usually have one or...

Classic Chip Line-Up Powers This Fun Dub Siren Synth

There’s a certain elite set of chips that fall into the “cold, dead hands” category, and they tend to be parts that have proven their worth over decades, not years. Chief among these is the ubiquitous 555 timer chip, which nearly 50 years after its release still finds its way into the strangest places. Add in other silicon stalwarts like the 741 op-amp...

Adversarial Makeup: Your Contouring Skills Could Defeat Facial Recognition

Facial recognition is everywhere these days. Cloud servers churn through every picture uploaded to social media, phone cameras help put faces to names, and CCTV systems are being used to trace citizens in their day-to-day lives. You might want to dodge this without arousing suspicion, just for a little privacy now and then. As it turns out, common makeup...

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