Two USB-C cables can look identical, fit the same port, and behave completely differently on your computer. One charges a laptop at full speed and transfers files in seconds; the other barely keeps a phone topped up. Baffling, I know. But you'd be surprised by how much stuff can differ between two cables full of copper.

Most USB cables are boring because they should be simple. The plugs are different on each end for a reason, and that reason is to stop you from doing something that seems harmless but isn't. A USB-A to USB-A cable is not just for show; it is dangerous. I have one, and if you know what you're doing, it doesn't hurt to have one too.

Two USB-C cables can look identical, cost wildly different amounts, and behave nothing alike. The reason sits inside the connector housing: a chip that talks to your devices before any power moves. It's genuinely useful engineering. It's also a convenient place to hide something nasty.

How careful are you when it comes to your PC's Ethernet ports? Because I gotta say, I've abused my fair share of both ports and connectors. I've yanked cables sideways, left them plugged in for years (even though they would've benefited from an upgrade), moved hardware around without disconnecting them first, and generally just taken them for granted. Most of the time, I got away with it.

People always say they don't have time to watch all the movies and TV shows they want to see. Ironically, in situations when we lose power at home, we have the time, but not the ability. That's why you need an emergency USB stick.

In the modern world USB has become a truly universal connector, with its inclusion on almost every major piece of consumer electronics. It has even expanded well beyond things that we’d think of as consumer electronics, like the solenoids on automatic sprinkler systems.

This project comes to us from [Ray Wang] at opensprinkler.org who has been working on various ways of controlling the old sprinkler standards, which generally rely on a 24 VAC power supply to drive solenoids. This tests uses the power available from USB-PD and closely examines four methods of energizing the solenoids: unipolar PWM, dual voltage, synthesizing an AC wave from a DC supply, and producing a bipolar square wave. The bipolar square wave had some interesting results, being able to get pretty close to the behavior of a true sine wave while minimizing the dedrmand on power electronics.

For those working on old sprinkler systems, or many other antiquated systems that still rely on 24 VAC, this project shows that USB can deliver a surprising amount of power in unique ways, and the fact that it’s near-ubiquitous and affordable makes it that much easier to adapt into situations it was never really designed for.

These old sprinkler systems have other ways of working on modern systems as well, like this one which replaces the AC source for a DC one, but with a few caveats.