Is it something in the water, or have there been a lot of really cool servo projects lately? Mechaduino is a board that sits on a regular stepper motor and turns it into a servo with a closed loop …

In the early days of broadcast television, national spectrum regulators struggled to reconcile the relatively huge bandwidth required by the new medium with the limited radio spectrum that could be al...

Like the fictitious invention of the Hula Hoop in Hudsucker Proxy, [David Spinden]'s big idea is small and obvious once you've seen it. And we're not saying that's a bad thing at all. What he's done i...

There are few projects that we see as many iterations of as the pet feeder or the plant waterer. (What is it with you people? Are you all as forgetful as we are?) Still, the fun is in the details o…

In our previous issues in this series on making circuit boards, we covered placing solder paste and placing components. Now it’s time to bake our cake! There are a variety of methods for refl…

Having to work away from the convenience of a workshop can be tough. But it's sometimes unavoidable and it always means planning ahead. When the work area also happens to be 150m under a lake's surf...

In this installment of Minimal MQTT, I’m going to cover two loose ends: one on the sensor node side, and one on the MQTT server side. Specifically, I’ll tackle the NodeMCU’s sleep…

Using PVC pipe as a pressure vessel for compressed air can be a fun and enjoyable hobby. It’s safe, too: while there are are reports of PVC pipe being the cause of accidents, these accidents …

If you have ever browsed an amateur radio magazine you could be forgiven for receiving the impression that it is a pursuit exclusively for the wealthy. Wall-to-wall adverts for very large and shiny…

In preparation for Makerfaire, [hwhardsoft] needed to throw together some demos. So they dug deep and produced this unique display. The display uses two synchronized peristaltic pumps to push water…

We like big displays, whether they're gigantic LED displays, CNC whiteboards, or a gigantic laser projectors. For his Hackaday Prize entry, [nilo] has come up with an easy way to create a huge graphic...

We're replacing "holy moley" in our vocabulary. Levitating globs of molten aluminum are that much more amazing. It's not that we couldn't believe it would work -- we understand the physics after the f...

USB On-The-Go (OTG) is one of the fun aspects of the USB standard. There are feelings about the other aspects, but that one is alright. Regardless, [Francesco] realized one day that the £3 digital …

It's been a long wait, but our latest single board computer for review is finally here! The BBC micro:bit, given free to every seventh-grade British child, has landed at Hackaday courtesy of a friend ...

[Rob Bailey] likes to build things and he likes ham radio. We are guessing he likes mints too since he's been known to jam things into Altoids tins. He had been thinking about building a code practic...

We return once again to the work of Dr. Claude E. Shannon, this time to his Masters thesis on relay switching circuit design. This thesis introduced switching algebra that allows the systematic des…

Say hello to my little friend, lovingly named Flaschen Taschen by the members of Noisebridge in San Francisco. It is a testament to their determination to drink Corona beer get more members involve…

Every now and then someone gets seriously inspired, and that urge just doesn’t go away until something gets created. For [Paulius Liekis], it led to creating a roughly 1:20 scale version of t…

Here's an interesting implementation of a classic: the 555 timer as astable multivibrator for the noble purpose of making weird music. [pratchel] calls this a Morgenflöte or morning flute, indi...

[Eitan] is one of those guys whose plants keep tottering between life and death. Can't blame the plants, because he just keeps forgetting when to water them. But keeping them hydrated requires him to ...