Lilla MIDI Expander

Sandro Grassia made Lilla, an neat, open source,  polyphonic MIDI expander.

Lilla’s controls features 12 rotary encoders and 8 pushbuttons and includes MIDI in, MIDI thru, and stereo out.  It can read files from and SD card as well as internal memory.

Additional details as well as code for the project can be found on GitHub.


Acoustic Levitator

Arvind Singh (forum user vindar) made an amazing acoustic levitator.

An acoustic levitator uses sound waves to levitate small objects, and until a few years ago were expensive to construct using Langevin horns that required tight tolerances and operate at high voltages.  Asier Marzo from Bristol University published a paper demonstrating how an acoustic levitator can be constructed from off the shelf parts and run on low-voltage.

Arvind built a levitator from an Instructible project based on an Arduino Nano, then decided to improve upon it by building one with a Teensy 3.2.  The processing power and memort of the Teensy 3.2 allowed for additional options to be added such as a TFT display and a joystick.

The casing was 3D printed using wood PLA then stained and varnished making for a beautiful device.

Code, schematics, and STL files are available on Git Hub.

RCA 118 “tombstone” MP3 Player

Mike Mitchell (dundakitty of the forum) took an old RCA 118 radio and turned into a very classy looking MP3 player.

The radio was stripped down to it’s chassis, retaining the original tuning dial and the knobs.  A couple of small speakers and a 20-watt stereo amplifier that are both controlled by a Teensy 3.6.

MP3 files of old radio broadcasts were collected and loaded onto a micro SD card.  The Teensy reads the capacitance of the tuner to randomly select a directory and file on the SD card to play.   The Teensy Audio Library was used to add a “hissing” sound between stations for an authentic old-time radio effect.  The project is housed in a beautiful, custom-made cabinet.


Larry’s Coffee Roaster

Larry McGovern (elkayem) developed a very cool coffee roaster that can roast up to a half pound of coffee using a custom roasting profile.

This fluid-bed style roaster can run in one of two modes – auto, where the temperature and fan speed are controlled by a settable profile; or manual, where the temperature and fan speed can be controlled in real time.    Temperatures, set value, fan speed, and heater duty cycle measurements are saved to an SD card while roasting as a CSV file for later analysis.

The roaster also has the ability to interface with Artisan Roaster Scope, an open-source software program for coffee roasting that records, analyzes, and controls roast profiles.  While the Teensy 3.5 used in the project collects roast data to the SD card, Artisan includes some nice features to analyze your roast.

There is a great detailed write up on this Git Hub page.  It not only includes code for the project, but schematics, Eagle files, files for the 3D printing of a few parts, and files to laser cut the the case.

Teensyboy by Catskull Electronics

David DeGraw of Catskull Electronics has developed Teensyboy, an awesome little MIDI adapter for a Nintendo Gameboy.

This compact little shield is about the size of thumb drive and uses USB MIDI.  Simply plug it into into a computer and fire up your favorite digital audio workstation (DAW) and you’ll be jamming with your Gameboy before you know it.

There is also a Teensyboy Pro that includes a variety of modes to accommodate Little Sound DJ (LSDJ), Nanoloop and mGB.  It also has convenient mounting holes for installation into a case.

Vague Robots has some tutorial videos on using the Teensyboy Pro with LSDJ

The software is available on catskull’s gitHub repository.  It’s a fork of this Arduinoboy software by trash80.

Countdown To 100th Birthday

Max created this beautiful countdown timer to his 100th birthday.

Max used Lixie displays, a ChronoDot for high accuracy time keeping, and a Teensy 3.6 to control everything, inside a beautifully stain finished wooden cabinet with brass trim.

Check out Max’s many excellent articles, working with the Lixie displays, mounting with brass hardware, and assembling the enclosure for a detailed log of the building process.  Max also published the complete source code, and let us know about his project by this forum thread.

Ferrofluid Display

A group of student group at University of Oslo called Applied Procrastination created this amazing display using 252 electro magnets… and gravity.

Teensy 3.6 and optimized code allowed fast enough control to hold the fluid stable.

Detailed are published on this Hackster page, and also this writeup.   The complete source code is published on github.

Their impressive software work is built on top of hardware featuring pretty amazing craftsmanship.  A grid 252 electro-magnets provide the force to move and suspend the display’s black fluid.

Electromagnets don’t just run themselves.  The team had to create a dozen custom driver circuit boards to control all those individual magnetic fields.

Really impressive work from this team!







Kelpie – Portable MIDI Synth

Kenneth Marut designed and developed the KELPIE, a portable monphonic and polyphonic digital synthesizer.

This incredible little synth is a great way for beginners to get started in the world of synthesizers.  It only requires a power supply and a MIDI connection that can plug right into MIDI device such as a keyboard.  It also include a 1/4″ mono output and 1/8″ stereo output.   The workmanship and attention to detail on this project is impressive.

Kenneth rolled his own Teensy 3.2 and Audio Shield to create the KELPIE and used Teensy Audio Library.  It includes USB input so that you can update the code.

More details on the project can be found on this project page.

This project is open source with hardware files and code available on GitHub.

thingSoC Adapter for Teensy 3x

Pattern Agents have developed TSOC_Teensy3x, a thingSoC adapter that allows you to connect thingSoC, Mikrobus, and Grove System modules using a Teensy 3.2

This clever adapter can be used with any thingSoC, Mikrobus, or Grove System modules.  It also works with a number of different IoT comptaible wireless radio modules as well as many different input and output sensors and modules giving you a lot of flexibility with a variety of sensors and actuators.

Additional details on the project are available on GitHub.

Predator Costume with Head Tracking Plasma Cannon

arkhipenko made an impressive Predator costume, complete with a head-tracking plasma gun.

This full-body costume features animatronics, two sound systems, laser lights, and props such as plasma gun!  A Teensy 3.5 was more than up for the task of of being the brains of it all.  The electronics are mounted in the plasma gun backpack that was cleverly made from a bicycle helmet.

As part of the project, arkhipendo modified the Adafruit PWM Servo Driver library as well as the library for the InvenSense MPU-9250 motion tracking device to make them more Teensy friendly.

More details on the build can be found on this Instructables page.

Source code for the project is available on GitHub.