Handstand Keyboard

alpage built a large keyboard to be played while doing a handstand.

When his handstand coach asked if anyone could build a piano that could be played with his feet while upside down, alpage stepped up to the task.  Using a Teensy 3.5 and wave table synthesis in the Audio Library, the piano came together.  The piano plays chords and has 4 different voices.

You can watch the keyboard being played with feet while in a handstand in this Facebook video.




Frank Piesik built the ElektroCaster, an awesome open, modular guitar-synth.

The incredibly versatile ElektroSynth is playable as both an electric guitar and and synth, and also has a pretty impressive list of features such as:

  • Parametric OpenScad modelling (changable string count, scale, space between strings,…)
  • Fully controllable RGB-Led-iluminated Fretboard (Only the first 17 frets for now, but easily exendable)
  • Touch-sensing-frets
  • Long scale (700mm) for low tunings
  • Two micros, one for audio an one for everything else.
  • Per string signal path
    • hexaphonic pickup
    • hex-preamp

This project came about because Frank had always wanted an illuminated fret-board to display information such as scales and sequences.  Armed with a 3D printer, CNC router and other maker tools, he set out to build a guitar from scratch.

The HackADay project page has some great information on the project as well as a detailed build log.  This is an open source project with the code available on GitHub and design files available on Dropbox (a Dropbox login is required)

Pitch Plus – Little League Baseball Wearable Device

Brett Garberman is part of a team that developed Pitch Plus, a wearable device for Little League baseball pitchers

Repetitive pitching is a leading cause of non-contact injuries in Little League.  Monitoring the number of pitches per player for a game, season, or month can be a challenging task.  The Medical Device club at the University of Pennsylvania’s Penn Health-Tech initiative developed Pitch Plus to help with monitor the pitching activity of Little League players.

The PitchPlus uses a Teensy 3.2 as its processor and also has an ADXL377 accelerometer.  The device collects data on the pitching activity of the player and stores it on an SD card.  Not only does it record pitch count, but the level of force in the pitch as well.  The data can then be imported into MATLAB for analysis.  It also includes a Bluetooth module that allows the data to be live-streamed for live visualization.  This allows for coaches to better monitor players and limit play time when needed to prevent injury.

Yet Another GPS Alarm Clock

Edward Ringel as built Yet Another GPS Alarm Clock that does quite a lot more than tell time.

An alarm clock with everything!  Has a high accuracy temperature compensated clock (DS3231), automatic sync to GPS time, large touchscreen user interface, handling of time zones and daylight savings time.

Code and schematics for the project are available on the ElektorLabs project page, but it looks like you will have to create an Elektor account to access them.


TiSi Box – X-Plane Flight Sim Addon

Hubert (forum user inovasim.de) has created the TiSi Box, a hardware add on to X-Plane that allows for a new kind of visual control.

The TiSi-box combines the nose wheel steering with the sight control using a self-centering rotary knob.  It interfaces with the X-Plane flight simulation software though a Teensy 3.2.

The TiSi-Box will available on the iNOVASim website.

Laser Harp

Johan Berglund built a very cool 16-note, multi-scale laser harp.

This impressive build features 16 beams, MIDI over USB and 5-pin DIN, adjustable octave and transposition, and and extensive list of  selectable scales.

This project page offers detailed information on how to build your own as well as schematics.  The code is available on GitHub.

ImportWorld – 3D Scanner

FilleK built a 3D scanner using a webcam and a couple of line lasers.

The scanner works by setting an object on a rotary table and a Logitech C920 webcam to capture images of it to a computer over USB.  All the hardware (except for the webcam) is controlled by a Teensy.