Phillip Schmidt has written, from the ground up, 3D printing software using the Teensy 3.5.

This YouTube video shows the software in action

Code for the project can be found on GitHub

Sonoclast created Plastic Pitch Plus, a microtonal MIDI machine.

The Plastic Pitch Plus is a device for experimenting with microtonality. It uses MIDI to map keys to microtonal pitches.

There are two basic scale modes available, a twelve-tone scale mode in which the twelve knobs are used to tune each of the twelve notes in a scale; and an equal divisions per octave mode.  Both modes are implemented in two ways – MIDI pitch bend, which works with all MIDI synthesizers and the MIDI tuning standard which works with newer hardware synthesizers.

This video demonstrates the functionality.

The Plastic Pitch Plus is available on Tindie.

The code is available on GitHub.

Michael Niles developed and made the Beacon notification system.

Beacon is a hardware device and computer software built for the sole purpose of notifying one or more persons of user-defined events.  It can be used for anything that can execute a command line application when something happens such as email clients, software monitoring, and task scheduling.  The device utilizes similar methods to cell phones for notification (sounds, flashing lights, and vibration).  Beacon connects to a computer via USB

Kris Kasprzak built a microphone monitor to set audio levels during video recording on a DSLR camera.

This DIY project displays the spectrum or a microphone input for 32 bands.  Includes a line in for powered microphones, a line out for connection to a camera, and an audio jack to monitor the audio with headphones.  Through the touch screen display you can adjust the audio levels as well as display settings.  All the settings are saved so that when you turn the unit back on, the settings will come back just as you last had them.

Code for the project can be found here.

Mads Christensen designed and made What are You Blinking about, a light art installation first shown at Create:Fixate Los Angeles

Each of the three 40″x40″ panels contain 900 WS2812B LEDs driven by a Teensy 3. The Teensys stay in sync with each other using a serial connection. The red/blue light sequences are generated algorithmically at up to 100 frames per second, creating subtle moire and interference patterns on the viewer’s retinas due to the interplay between rods and cones in the human eye.

Howard Harte hacked the connection between an Astrix PBX and old payphone by emulating the coin line.

This project creates the high voltage signals a Western Electric 1D/2D Payphone requires to manage calls, accept coins, etc.  These signals include both +130VDC (coin collect) and -130VDC (coin refund) as well as +25VDC for the “stuck coin” test and -25VDC for the “initial rate” test.  It can also count dial pulses to provide out-of-band signalling to Asterisk for the rotary-style 1D1 payphones.

Additional details on the project, including the code, can be found on this GitHub page.

zike, a fan of antique oscilloscopes , used a Teensy 3.5 and a couple of probes to draw vector fonts on the display of an old analog oscilloscope.

The project was inspired by this vector display introduction by Trammel Hudson of NYCResistor using a Teensy 2.0 and an R-2R ladder DAC built with 32 resistors (16 per channel) .  This project makes use of the Teensy 3.5’s built-in DAC with no additional parts.  The fonts are Hershey vector fonts, originally designed to be rendered on early CRT displays.

Code for the project can be found on this forum thread.

Natthakit Kim Kang designed and built and incredible interactive LED installation, Click Canvas.

The project was developed to display at Yolo House, a creative space and gallery in Bangkok.  The installation features 187 LED boxes in a 17 x 11 grid that change colors when users press them.  It uses a Teensy 3.6 to control 2,244 LEDs.

Be sure to check out the project write up over on Hackster.io.  Kim has a great write on the process of developing and installing the project.

Fashion tech designer Rachel Freire designed Jump North, a custom jumpsuit that senses where the direction north is.

The project was a commission as part of her residency at KOBA, an electronic textile tailor shop on Germany. Rachel decided she wanted a version of the “Northbelt” built in to her jumpsuit that would allow her to always sense where north is. Jumping triggers the north-mode on and off. When you sit still for too long the belt will start to “purr”, waking you up, encouraging you to move as a travel companion might, or relaxing you as it causes you to focus on the sensation.

Code for the project is available on GitHub

Check out this flikr photo gallery for more photos of the project

Charles Mangin made a neat little shield that allows you to connect your Applie II joystick to a modern computer via USB.

This shield connects an Apple II compatible joystick with either a DIP16 (logic board “game port”) or DB9 connector (back panel “joystick port”) to a modern computer via USB.

Source code and PCB files can be found on GitHub