A Bluetooth Speaker For Babies

December 11, 2017 by James Hobson 11 Comments

[Mike Clifford] of [Modustrial Maker] had not one, not two, but five friends call him to announce that their first children were on the way, and he was inspired to build them a Bluetooth speaker with a unique LED matrix display as a fitting gift. Meant to not only entertain guests, but to audio-visually stimulate each of their children to promote neurological development.

Picking up and planing down rough maple planks, [Clifford] built a mitered box to house the components before applying wood finish. The brain inside the box is an Arduino Mega — or a suitable clone — controlling a Dayton Bluetooth audio and 2x15W amp board. In addition to the 19.7V power supply, there’s a step down converter for the Mega, and a mic to make the LED matrix sound-reactive. The LED matrix is on a moveable baffle to adjust the distance between it and a semi-transparent acrylic light diffuser. This shifts the light between sharp points or a softer, blended look — perfect for the scrolling Matrix text and fireplace effects! Check it out!

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Rock Out With The Nod Bang

December 10, 2017 by Will Sweatman 7 Comments

In our years here on Hackaday, we’ve seen our fair share of musical hacks. They even have their own category! (Pro Tip – you can find it under the drop down menu in the Categories section). But this one takes the cake. [Andrew Lee] is a student at New York University who had a task of creating a project for his physical computing class. In about 60 days time; he went from dinner napkin sketch to working project. The project is quite interesting – he’s made an instrument that plays music as you move your head.

It works as you would expect. An accelerometer in the user’s headphones feed data to an arduino. There are four (3D printed of course) buttons that are used to select the the type of audio being played. The operation goes as such:

Press button.
Bang head.

[Andrew] speaks of a particular satisfaction of hearing the music play in sync with the rhythm of head movement. Be sure to check out the video below to see the Nod Bang in action.

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Making A Motorized Turntable Portable

December 5, 2017 by James Hobson 2 Comments

[Robin Reiter] needed a better way to show off his work. He previously converted an electric TV stand into a full 360-degree display turntable, but it relied on an external power supply to get it spinning. It was time to give it an upgrade.

Putting his spacial organization skills to work, [Reiter] has crammed a mini OLED display, rotary encoder, a LiPo 18650 battery and charging circuit, a pair of buck converters, a power switch, and an Arduino pro mini into the small control console. To further maximize space, [Reiter] stripped out the pin headers and wired the components together directly. It attaches to the turntable in question with magnets, so it can be removed out of frame, or for displaying larger objects!

When first powered on, the turntable holds in pause mode giving [Reiter] time to adjust the speed and direction. He also took the time to add an optical rotary encoder disk to the turntable and give the gearing a much needed cleaning. Check out the project video after the break!

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Gesture Control For Lunch Money

December 3, 2017 by Al Williams 16 Comments

[Dimitris Platis] wanted to add gesture control to his PC. You’d think that would be expensive, but by combining a diminutive Arduino, a breakout board with a gesture controller, and an interconnect PCB, he managed to pull it off for about $7. That doesn’t include the optional 3D-printed case and we think you could omit the interconnect board if you don’t mind some wires and further cut costs. [Dimitris] calls it Nevma, and you can see how the device works in the video below.

The heart of the project is a sensor that measures light and motion. The chip and the breakout board are just a couple of bucks if you order them from China. You can find them in the US if you don’t mind spending a little bit more. The device has an I2C interface, and [Dimitris] uses a tiny Mini SS Micro for the USB interface and the CPU.

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Modified Uke Keeps The Beat With A Solenoid

December 2, 2017 by Kristina Panos 13 Comments

A classic one-man band generally features a stringed instrument or two, a harmonica in a hands-free holder, and some kind of percussion, usually a bass drum worn like a backpack and maybe some cymbals between the knees. The musician might also knock or tap the sound-boards of stringed instruments percussively with their strumming hand, which is something classical and flamenco guitarists can pull off with surprising range.

The musician usually has to manipulate each instrument manually. When it comes to percussion, [JimRD] has another idea: keep the beat by pounding the soundboard with a solenoid. He built a simple Arduino-driven MOSFET circuit to deliver knocks of variable BPM to the sound-board of a ukulele. A 10kΩ pot controls the meter and beat frequency, and the sound is picked up by a mic on the bridge. So far, it does 3/4 and 4/4 time, but [JimRD] has made the code freely available for expansion. Somebody make it do 5/4, because we’d love to hear [JimRD] play “Take Five“.

He didn’t do this to his good uke, mind you—it’s an old beater that he didn’t mind drilling and gluing. We were a bit skeptical at first, but the resonance sweetens the electromechanical knock of the solenoid slug. That, and [JimRD] has some pretty good chops. Ax your way past the break to give it a listen.

Got a cheap ukulele but don’t know how to play it? If you make flames shoot out from the headstock, that won’t matter as much. No ukes? Just print one.

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Arduino Saves Game Boy Camera

December 1, 2017 by Al Williams 7 Comments

[Brian Khuu] bought a few Game Boy cameras on the Internet and found that they still had pictures on them from the previous owners. The memory in the camera has a backup battery and if that battery dies, the pictures are history, so he decided to mount a rescue operation.

He knew the protocol for how the Game Boy talked to the companion pocket printer was available, so he used an Arduino and a Web browser to extract the photos. The resulting code is on GitHub if you want to save your pictures. Although [Brian] didn’t have to crack the protocol, he does offer a good explanation of it. There’s even some sniffed displays. The Arduino does all the communications and fools the game into thinking it is the companion printer. However, it simply streams the data out and a Javascript decoder handles the actual decoding. In fact, in the blog post, you can enter data, click a button, and see the resulting Game Boy picture.

It works, but [Brian] did run into a few problems. For one thing, the devices don’t seem to use any flow control so he had no choice but to keep up with the Game Boy. Also, there is a CRC he could not correctly decode. However, the pictures look good — well, as good as Game Boy pictures look, at least. So he did get results.

We’ve seen this done with a PC before. If you are more interested in the reverse, by the way, you can use a real Game Boy printer to print from an Arduino.

Gesture Keyboard For Universal Input

November 29, 2017 by Brian McEvoy 14 Comments

Keyboards are currently the most universally accepted computer input devices. They may be wired, wireless, or virtual, but the chances are that you’re within a few centimeters of a keyboard right now. [Federico Terzi] built a prototype from an Arduino and an accelerometer which conceptually resembles writing in Palm’s old Graffiti, though this version is performed in mid-air with a handheld instead of a little square at the bottom of an LCD screen. He can also operate wirelessly with a Bluetooth module and battery.

The task of the Arduino is to take data from the accelerometer and feed it to the computer whenever a 12mm switch is pressed. Each letter is individually learned by his Python code and scikit-learn’s Support Vector Machine. There’s nothing holding a user back from giving single-letter commands to your favorite programs. For example, it would be possible to give a thumbs-up in meatspace when you want to upvote or covering your ears could mute the audio.

We love keyboard hacks like this mechanical macro keyboard, a minimal and elegant USB Morse key(board), and Brian Benchoff’s open love-letter to mechanical keyboards.

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