The ESP8266 has become incredibly popular in a relatively short time, and it’s no wonder. Cheap as dirt, impressively powerful, Arduino-compatible, and best of all, includes Wi-Fi right out o…
Sometimes, we need devices to notify us of something. The oven timer is going off. Your phone has a push notification. The smoke detector battery is getting low. All of these problems can be solved with a buzzer or an LED. It’s a simple and cheap problem to solve.
But what if you need to know if something’s wrong with a diesel engine that throwing out 90 dB of noise? What if you’re not guaranteed to be around that engine? What if you need to tell everyone within a half mile that something is wrong. Again, LEDs and beepers, but the standard, off-the-shelf implementation isn’t going to cut it. You need massive amounts of buzzers and LEDs, and you’re going to need to drive them all with some reasonably high current. How do you solve that problem?
This is the problem [Tegwyn] had to solve for another one of his Hackaday Prize entries. The solution is what you would expect — buzzers and LEDs — but he’s putting some serious current behind these devices. There are, in fact, thermal considerations taken into account when you’re beeping this many buzzers.
The LEDs for this project are a handful of blindingly bright 1209 and 1206 SMD parts, and the buzzer is an obnoxiously loud SMD 97 dB buzzer. There are eight buzzers on this board. So, how do you drive these power-hungry devices? [Tegwyn] is using an L293E half-bridge motor driver, in a ‘Power-DIP’ package for relatively effective heat dissipation. Does it work? Oh, yes, and it’s very annoying. Take a look at the video below and judge for yourself. You can, indeed, make something louder and more annoying by adding more power.
Though J.R.R. Tolkien passed away in 1973, he has never really stopped publishing. For decades his son and literary executor Christopher Tolkien has painstakingly catalogued and edited his father’s papers, creating new books out of unfinished and unpublished manuscripts. Most of those tales delve deep into the history of Middle-earth, the fantasy realm where Tolkien’s best known works, The Hobbit and The Lord of the Rings series take place. Now, it’s likely that work will come to an end with one last Tolkien book. Critic Andrew Ervin at The Washington Post reports that The Fall of Gondolin, which will be released tomorrow, is likely J.R.R. and Christopher Tolkien’s swan song.
While this story may be the last Tolkien book to be published, it is actually an early tale and foundational to the author’s entire concept of Middle-earth. It was first written in 1917 while Tolkien was recuperating in a hospital from trench fever after the Battle of the Somme. “It’s a quest story with a reluctant hero who turns into a genuine hero—it’s a template for everything Tolkien wrote afterwards,” John Garth, author of a book about Tolkien’s experience in World War I tells Alison Flood at The Guardian. “It has a dark lord, our first encounter with orcs and balrogs—it’s really Tolkien limbering up for what he would be doing later.”
Violins: they’re often the first example people site when talking about traditional acoustic instruments. But using new pickup techniques and rapid prototyping, that could be about to change.
violinmakers.org is a community for this new kind of digital age luthier – a place to discuss 3D printing and magnetic pickup possibilities and electric violin fabrication, rather than gut strings and wood carving.
Community member Guy Sheffer spoke recently about why this matters. All that legacy of instrument building has perfected acoustic violins, but electric violins remain crude. As Guy writes: “The challenge is, that while modern instruments have been developing effects and new sounds, acoustic violins have been acoustic for the past 400 years.”
It’s probably not much of a stretch to say that many of us have taken on a project or two that were little more than thinly veiled excuses to add a new tool or piece of gear to our arsenal. There’s something to be said for a bench full of button-festooned test equipment blinking away, it’s like bling for nerds. But just like getting your name written out in diamonds, it can get expensive quick.
Luckily, the hacker has enough technology at their disposal these days that DIY test equipment can help fill your bench without emptying your wallet. [Faransky] has created a very impressive Arduino function generator that doesn’t skimp on the features. Capable of generating sine, triangle, and square waves up to 10MHz with its all-digital circuitry, it’s a piece of gear that’s well worth the $30 USD or so it should cost to build your own version.
For those worrying that [Faransky] is relying on the PWM functionality of the Arduino Nano to generate waveforms, have no fear. At the heart of the device is a AD9833 waveform generator; with the Arduino, rotary encoder, and 16×2 LCD providing an interface to control it over SPI.
Unfortunately, the AD9833 doesn’t have a way to control amplitude, something which is pretty important in a function generator. So [Faransky] uses a X9C104P 100KOhm 8-bit digital potentiometer as a voltage divider on the chip’s output.
To wrap up the build, he added a 2000mAh 3.7V Li-Ion battery and TP4056 charger, with a DC-DC boost converter to get 5V for the Arduino. Though if you wanted to create a benchtop version of this device, you could delete those components in favor of a 5V AC/DC adapter.
We’ve seen our fair share of DIY function generators, ranging from minimalist builds to hardware that could pass for a commercial offering. We’ve even seen some cheap turn-key function generators, though the usual warnings about getting what you pay for apply.
“We study krill so we understand whether its trends and abundance are likely to be influenced by how much fishing effort we do, but also whether that fishing effort will impact the upper trophic levels like penguins and seals,” said Christian Reiss, a senior researcher at the Southwest Fisheries Science Center in La Jolla.
But packing up a research vessel and traveling to the bottom of the world takes time and money. Both are in short supply at a federal agency that is keeping a close eye on shrinking budgets.
That is why the Teledyne G3 Slocum drone is so attractive.
The eight-foot-long submersible can carry sophisticated acoustic devices that are high-tech fish finders. The autonomous machine can identify and measure how many krill there are when it encounters a swarm.
Welcome to drone day on the Adafruit blog. Every Monday we deliver the latest news, products and more from the Unmanned Aerial Vehicles (UAV), quadcopter and drone communities. Drones can be used for video & photography (dronies), civil applications, policing, farming, firefighting, military and non-military security work, such as surveillance of pipelines. Previous posts can be found via the #drone tag and our drone / UAV categories.
As we soak in the last rays of summer Adafruit would like to send a huge thank you to all the employees that make Adafruit what it is!
Today the team gets a day off in recognition of Labor Day. In the mantra of “Be excellent” Adafruit is always looking for ways to give workers more. We recently added a new paid day off for Election Day, and will keep looking for ways show gratitude and encouragement to the workforce!
Because of the great community and teamwork we are able to do what we do.