Hydrogen is a useful gas. Whether you want to float an airship, fuel a truck, or heat an industrial process, hydrogen can do the job. However, producing it is currently …read more (https://hackaday.com/2023/04/27/making-hydrogen-with-solar-energy-with-oxygen-and-heat-a-bonus/)

Op Amp Challenge: What’s Your Monitor’s Delay?
https://hackaday.com/2023/04/27/op-amp-challenge-whats-your-monitors-delay/

In the days of CRT displays, the precise synchronization between source and display meant that the time between a video line appearing at the input and the dot writing it …read more (https://hackaday.com/2023/04/27/op-amp-challenge-whats-your-monitors-delay/)

Smooth Animations, Slick Bar Graphs, but No Custom Characters on This 16×2 OLED
https://hackaday.com/2023/04/27/smooth-animations-slick-bar-graphs-but-no-custom-characters-on-this-16x2-oled/

Sometimes, finding new ways to use old hardware requires awesome feats of reverse engineering, software sleight of hand, and a healthy dose of good fortune. Other times, though, it’s just …read more (https://hackaday.com/2023/04/27/smooth-animations-slick-bar-graphs-but-no-custom-characters-on-this-16x2-oled/)

Cheap Deburring Tool Is Game Changer For 3D Printing
https://hackaday.com/2023/04/27/cheap-deburring-tool-is-game-changer-for-3d-printing/

3D printing’s real value is that you can whip up objects in all kinds of whacky geometries with a minimum of fuss. However, there’s almost always some post-processing to do. …read more (https://hackaday.com/2023/04/27/cheap-deburring-tool-is-game-changer-for-3d-printing/)

Solving the Mystery of the Mayan Calendar’s 819-Count Cycle
https://hackaday.com/2023/04/27/solving-the-mystery-of-the-mayan-calendars-819-count-cycle/

El Caracol observatory at Chichen Itza.
" data-medium-file="https://hackaday.com/wp-content/uploads/2023/04/El_Caracol_observatory.jpg?w=400" data-large-file="https://hackaday.com/wp-content/uploads/2023/04/El_Caracol_observatory.jpg?w=800">Despite the mysticism that often clouds the Mayan calendar in popular culture, fact remains that the calendar system in use by the Mayans was based on a system used throughout …read more (https://hackaday.com/2023/04/27/solving-the-mystery-of-the-mayan-calendars-819-count-cycle/)

Using An Old Smartphone In Place of A Raspberry Pi
https://hackaday.com/2023/04/27/using-an-old-smartphone-in-place-of-a-raspberry-pi/

The Raspberry Pi was a fairly revolutionary computing device when it came on the scene around a decade ago. Enough processing power to run a full Linux desktop and plenty …read more (https://hackaday.com/2023/04/27/using-an-old-smartphone-in-place-of-a-raspberry-pi/)

The Cheap And Available Microwave Playground
https://hackaday.com/2023/04/28/the-cheap-and-available-microwave-playground/

There’s something of a mystique about RF construction at the higher frequencies, it’s seen as a Black Art only practiced by elite wizards. In fact, UHF and microwave RF circuitry …read more (https://hackaday.com/2023/04/28/the-cheap-and-available-microwave-playground/)