LED Ring Brings The Bling

We’ve seen our share of light-up jewelry over the years, but for some reason — probably power — it’s almost always earrings or necklaces. So when we saw [ROBO HUB]’s L…

2023 Halloween Hackfest: Flickering Pumpkin Pin Is Solidly Built

Now first of all, [Steph] grants that you can already take your pick of several LED pumpkin badges out there on IO. That’s not the point. The point is that this flickering pumpkin pin is nice…

Minimizing Stress On A Coin Cell Battery

When it comes to powering tiny devices for a long time, coin cell batteries are the battery of choice for things like keyfobs, watches, and even some IoT devices. They’re inexpensive and comp…

A Handy OSHW USB Cable Tester For Your Toolkit

There’s no shame in admitting you’ve been burned by a cheapo USB cable — ever since some bean counter realized there was a few cents to be saved by producing “power only&#82…

Careful Cuts Lets Logger Last A Year On A Coin Cell

Coin cells are great for backup power for things like real-time clocks, or even for powering incredibly small mechanical devices like watches. But for something like a data logger, running on a sta…

Tiny Talisman Warns Wearer About UV Exposure

Given how important our Sun is, our ancestors can be forgiven for seeing it as a god. And even now that we know what it actually is and how it works, it’s not much of a reach to think that th…

One Man’s Quest To Build A Baby Book With Brains

Regular readers will know that Hackaday generally steers clear of active crowdfunding campaigns. But occasionally we do run across a project that’s unique enough that we feel compelled to dus…

An OLED Photo Frame Powered By The ATtiny85

Rolling your own digital picture frame that loads images from an SD card and displays them on an LCD with a modern microcontroller like the ESP32 is an afternoon project, even less if you pull in s…