To put this into context, I took my first Loopy’s tubing trip long before waterproof Bluetooth speakers were something you could just go pick up at your local Circuit City. For the average rivergoer, a tranquil float down the serene Chippewa River on a beautiful sunny day is already pretty hard to beat. But what kind of engineer would I be if I didn’t seize the opportunity to enhance such a natural experience with a piece of cobbled together tech designed for the sole purpose of blasting out the fattest bangers of 2005? What started out as a dumpster dived Continue Reading
RK
The Voice™: Maker Edition (DIY Bluetooth Game Show Buzzers)
tl;dr: I made 3D printed, bluetooth game show buzzers for playing The Voice at home, powered by Adafruit Circuit Playground Bluefruit boards and a laptop. Bringing Reality TV to Reality If you ask me, combining a makeshift karaoke setup, cheap beer, and good friends all but guarantees a fun night. Ok who am I kidding, my college days are well behind me – decent beer. Anyway, toss in some random swivel chairs and before you know it, you’re playing your own version of The Voice™ wishing you had some big red buttons to smash. That’s the origin story of this Continue Reading
Making it rain with Software Defined Radio
For about the same cost as of case of PBR, you can buy a cheap software defined radio called the RTL-SDR. With this simple USB dongle, you can turn your PC into a wideband radio scanner and use it to sniff out RF signals anywhere from 25 MHz to 1700 MHz. In case you’re not familiar, an SDR receiver works a lot like a traditional radio transceiver, except that most, if not all, of the signal processing that would normally happen in hardware, is done with software instead. Essentially, an SDR receiver captures the raw radio signals (using a tuner), Continue Reading
A wireless water level sensor for the Internet of Tannenbaums
I rigged up a crude little water level sensor to monitor my Christmas tree and send me alerts when it gets thirsty. With the help of two strips of aluminum stuffed in a FoodSaver bag, an Adafruit HUZZAH32 – ESP32 Feather Board, and a little Arduino code, our humble tree has become part of the IoT revolution! Physics lab flashback The sensing probe that goes in the water is basically just a parallel plate capacitor straight out of undergrad physics. The water flows between the plates and works as a dielectric. The relative permittivity (aka dielectric constant) of water is Continue Reading
Watts ur microwave power, bruh?
Over the past year or so, I’ve been dabbling in bread baking. One of the first steps to every batch is to get about 750 mL of water to a specific temperature, ranging from 85 °F to 105 °F. The standard drill was to just mix hot and cold water from the tap until I got within a degree or so of the target temperature. Then I’d take that and repeatedly pour out a little bit, weighing it each time, until I got to the exact amount I needed. This method worked fine enough, but the tediousness of the whole Continue Reading
Semi-permanent Railing Extension For Baby Gate
In case that awkward title doesn’t paint a perfect mental picture for you, here’s a little more context: When we bought our split-level house, we didn’t really think much about baby proofing it. Now that the little guy is mobile, it feels like we spend about 98% of our waking hours making sure he doesn’t go tumbling down the stairs. We had a baby gate that could conceivably keep him out of harms way, but there was no obvious way to mount it at the top of the stairs. The solution I came up with was to design some 3D-printed Continue Reading
Kubb
A couple years ago we got into a yard game called Kubb (rhymes with tube). Since then it’s grown quite a bit in popularity, at least around here. If you haven’t heard of it, the basic idea is for each team to take turns trying to knock down the short wooden blocks (called Kubbs) by throwing the long skinny wooden blocks (batons) at them from the other side of the yard (called a pitch) without hitting the extra large wooden block (the King) in the middle (until the end of the game). Sounds thrilling, I know! The full rules are Continue Reading
Oldsmobile Modsmobile
If there’s one good thing about driving a $500 POS with no A/C and a driver’s door that doesn’t open, I guess it’d be that you can’t really make it much worse. Before the brakes blew out for the second time, I made a couple mods to my 1995 (??) Cutlass Supreme, aka The Stallion. Since the Cutlass was already an extremely high-performance machine, and that fact that I know next to nothing about auto mechanics, the upgrades were purely electronics related. CarPlay The first order of business was to hack in an aux input into the radio, which only Continue Reading
Battery pack spot welder
This one might have to be filed under the fail column – at least for now. While throwing around some ideas for the next incarnation of DJ Big Gulp, I decided I needed to figure out how to make my own lithium ion battery packs. I bought a couple of INR18650s, some battery protection boards, and some nickel strips to connect them together. All I needed was the welder… The showstopper I thought it might be safer to try this rig out on some alkaline batteries before diving straight into the lithium ion. At first the welds seemed to be Continue Reading
DJ Big Gulp
Need tunes on the river? DJ Big Gulp’s got you covered! Bluetooth enabled and ready to party for hours!