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 …read more Continue reading LED Ring Brings the Bling
Category Archives: coin cell
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 …read more Continue reading 2023 Halloween Hackfest: Flickering Pumpkin Pin Is Solidly Built
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 …read more Continue reading Minimizing Stress on a Coin Cell Battery
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 …read more Continue reading A Handy OSHW USB Cable Tester For Your Toolkit
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 …read more Continue reading Careful Cuts Lets Logger Last a Year On A Coin Cell
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 …read more Continue reading Tiny Talisman Warns Wearer About UV Exposure
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 dust …read more Continue reading One Man’s Quest to Build a Baby Book With Brains
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, …read more Continue reading An OLED Photo Frame Powered by the ATtiny85
PixMob LED Wristband Teardown (Plus IR Emitters and How To Spot Them)
PixMob units are wearable LED devices intended for crowds of attendees at events like concerts. These devices allow synchronized LED effects throughout the crowd. [yeokm1] did a teardown of one obtained from a preview for the 2019 Singapore National Day Parade (NDP), and in the process learned about the devices …read more
Continue reading PixMob LED Wristband Teardown (Plus IR Emitters and How To Spot Them)
Tiny Two-Digit Thermometer Has Long Battery Life
Like most of his work, this tiny two-digit thermometer shows that [David Johnson-Davies] has a knack for projects that make efficient use of hardware. No pin is left unused between the DS18B20 temperature sensor, the surface mount seven-segment LED displays, and the ATtiny84 driving it all. With the temperature flashing …read more
Continue reading Tiny Two-Digit Thermometer Has Long Battery Life