Smart Juggling Balls

For the 2015 Hack a Day Prize, [Arkadi] is working on an educational platform using the Arduino for Smart Juggling Balls.

His goal for this is to create an open-source platform which, beyond juggling, can be used to teach physics in both an interactive and fun way. The juggling balls feature a RGB LED, an Arduino pro mini, and some MPU’s. They can be programmed to change color based on acceleration, gravity, centripetal force, rotation, or even controlled remotely. As the project develops further, he also plans on creating lecture content to go alongside the project, which would make it an excellent and interactive project for a high school (or even college) tech or physics class.

It’s not completely done yet but he’s already posted all the source code and instructions for making your own set over on GitHub. Stick around after the break to see the prototype balls in action and don’t forget to get cracking on your own Hackaday Prize entry!

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Slick Six-Voice Synth for AVRs

He started off making an AVR synthesized guitar, but [Erix] ended up with much more: a complete six-voice AVR wavetable synthesis song machine that’ll run on an ATMega328 — for instance, on an Arduino Uno.

If you’re an AVR coder, or interested in direct-digital synthesis or PWM audio output, you should have a look at his code (zip file). If you’d just like to use the chip to make some tunes, have a gander at the video below the break.

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An Introduction To Individually Addressable LED Matrices

The most fascinating project you can build is something with a bunch of blinky hypnotic LEDs, and the easiest way to build this is with a bunch of individually addressable RGB LEDs. [Ole] has a great introduction to driving RGB LED matrices using only five data pins on a microcontroller.

The one thing that is most often forgotten in a project involving gigantic matrices of RGB LEDs is how to mount them. The enclosure for these LEDs should probably be light and non-conductive. If you’re really clever, each individual LED should be in a light-proof box with a translucent cover on it. [Ole] isn’t doing that here; this matrix is just a bit of wood with some WS2812s glued down to it.

To drive the LEDs, [Ole] is using an Arduino. Even though the WS2812s are individually addressable and only one data pin is needed, [Ole] is using five individual data lines for this matrix. It works okay, and the entire setup can be changed at some point in the future. It’s still a great introduction to individually addressable LED matrices.

If you’d like to see what can be done with a whole bunch of individually addressable LEDs, here’s the FLED that will probably be at our LA meetup in two weeks. There are some crazy engineering challenges and several pounds of solder in the FLED. For the writeup on that, here you go.

Linear Book Scanner Does it with Arduino

About two and half years ago, the Google Books team open-sourced the plans for their book scanning rig, and there was much rejoicing. As [Dany Qumsiyeh] explained in the Google Tech talk we linked to at the time, the scanner uses a vacuum to lift the next page from the stack and turn it, saving hours of human labor and, admittedly, putting books in a little bit of danger.

[Chris] tipped us off about a different take on the linear book scanner created by [Forssa1] that uses server fan to turn the pages. [Forssa1]’s rig is built from laser-cut acrylic and employs two handheld scanners driven by an Arduino Mega. We don’t have a great deal of information about this build, but you can check it out after the break.

UPDATE: [Forssa1] checked in with us and sent a link to more build photos of his book scanner.

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ASCII Art With Pure Data And A Typewriter

[vtol] is quickly becoming our favorite technological artist. Just a few weeks ago he graced us with a Game Boy Camera gun, complete with the classic Game Boy printer. Now, he’s somehow managed to create even lower resolution images with a modified typewriter that produces ASCII art images.

As with everything dealing with typewriters, machine selection is key. [vtol] is using a Brother SX-4000 typewriter for this build, a neat little daisy wheel machine that’s somehow still being made today. The typewriter is controlled by an Arduino Mega that captures an image from a camera, converts it to ASCII art with Pure Data and MAX/MSP, then slowly (and loudly) prints it on a piece of paper one character at a time.

The ASCII art typewriter was recently shown at the 101 Festival where a number of people stood in front of a camera and slowly watched a portrait assemble itself out of individual characters. Check out the video of the exhibit below.

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Driving A Brushless DC Motor Sloooooooowly

Driving a brushless DC (gimbal) motor can be a pain in the transistors. [Ignas] has written up a nice article not only explaining how to do just this with an Arduino, but also explaining a little bit on how the process works. He uses a L6234 Three Phase Motor Driver, but points out that there are other ways to interface the BLDC motor with the Arduino.

warningA warning is warranted – this is not for the faint of heart. You can easily destroy your microcontroller if you’re not careful. [Ignas] added several current limiting resistors and capacitors as advised in the application note (PDF warning) to keep things safe.

Everything worked well at high speeds, but for slower speeds the motor was choppy. [Ingus] solved this riddle by changing over to a sine wave to drive the motor. Instead of making the Arduino calculate the wave, he used a look up table.

Be sure to check out his blog for full source and schematics. There is also a video demonstrating just how slow he can make the motor move below.

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Your Arduino Packaging Could Sway a Court Case

Our friends over at Adafruit just made an interesting suggestion regarding the Arduino vs. Arduino saga. They noticed that the packaging for the Arduino UNO includes a pamphlet that states:

Manufactured under license
from Arduino by

Wow. That’s pretty interesting. Smart Projects is the former name of Arduino SRL. If you missed it, go back and read some of our previous coverage. Specifically, Arduino SRL is claiming to be the real trademark holder and has gone as far as forking the Arduino IDE and upping the version number in what appears to be an attempt to direct users toward their newly founded website/ecosystem/quagmire. If they feel they own the trademark why would they include this statement in their packaging?

Finding this in the a unit from a September 2014 is interesting. But Adafruit’s post is a call to action. We share their curiosity of discovering how far back official Arduino hardware has included such license notices. So, head on down to your work bench… start peeling back years worth of discarded hacks, clipped leads, fried servos, and other detritus. Find the packaging and take a picture. Bonus points if you have an invoice that associates a date with it. Either way, post the pictures on your social media hub of choice with #TeamArduinoCC. You can also embed it in the comments using HTML IMG tags if you wish.

Standard “I am not a lawyer” disclaimer applies here. We know you aren’t either so let’s all share what we think this means to pending lawsuits in the comments. Does this matter and why?