Ali Afshar (alialiali on the forum) built a chordboard – a nifty synth project that includes a drum sequencer.

Ali describes this labor or love project as playing the major keys of piano with the ability to change the key and mode.  It’s pretty easy to play and get a decent result.  It also features a drum sequencer, strings, chords, and other stuff.  The interface uses the oh so satisfying Cherry MX keys that have LEDs in them and a few pots to control things like tempo.

Audio Analyzer

Marcell Marosvolgvi made an audio analyzer using a Teensy 3.2 and Audio Shield.

This project uses a Teensy 3.2 to generate a sine wave and send the output to an audio shield.  Using a external loop, the data is fed back into the input of the shield and read by the Teensy and analyzed.  The data is then sent to a Raspberry Pi for graphing and displayed on a 7″ TFT display.

Code for the project is published on GitHub.



Frank (forum user DD4WH) made a microSoundRecorder to log both audio and environmental data to an SD card.

The recorder uses a BME280 sensor to log temperature, air pressure and humidity, and a BH1750 sensor to log light intensity.  It also includes a digital microphone to capture audio.

The project made use of Walter’s (forum user WMXZ) environmental sound recorder library.  Additional information on how to connect the sensors to the Teensy can be found on this GitHub page.

Cyclotron Controller

Tim Cowden (Cowlander on the forum) has been using a Teensy 3.5 to build a controller for a cyclotron particle accelerator.

As part operations staff at the Cyclotron Institute at at Texas A&M University, Tim is responsible for the control systems.  He’s been working on replacing the Rabbit 3200 embedded controller they’ve been using with a Teensy 3.5.  The Teensy 3.5 has proven to be a good fit when combined with a Wiz850 network module.

Synthetica – Harmonica Synth

Benjamin Poilve (BenIP on the forum) has made a neat little hand-held instrument, Synthetica.

Ben came up with an idea to make a musical instrument to play around with chord progressions as a way to experiment with music composition.  He came up with Synthetica, a handheld synthesizer.  Synthetica is played using capacitive touch with one hand selecting a chord and the other hand selecting a note.  With some help from the forum he got his project up and running.

Some of the features include pots to control:

  • Delay time
  • Delay feedback
  • Octive detaune
  • LFO frequency
  • LFO detune
  • LFO mix

Code for the project has been published on GitHub.

Smomid Instrument

Nick Demopoulos built an amazing guitar-synth MIDI controller,  Smomid.

Smomid (String Modeling Midi Device) is a synth instrument in the shape of a guitar.  It’s incredibly versatile with a long list of features and functionality.  Thanks to some guidance offered on the forum, Nick was able to upgrade the micro controllers in the second version to a pair of Teensy 3.6s.

You can find recordings of Nick playing Smomid on his website.

OpenDog Robot

James Burton has upgraded the micro controller on his impressive openDog robot with a Teensy 3.6.

James has been building open Dog, an open source robot inspired by the Boston Dynamics dog robots.  He recently upgraded the micro controller to the Teensy 3.6, replacing 3 Arduino MEGAs with it.  The Teensy 3.6 provides 6 serial ports, needed for the motor controllers, and allows the code to run in one place, avoiding multiple serial hops.

He’s published a multi part video series on the building of openDog that is well worth checking out.

The project is fully open source with the code published on GitHub.