The “Guitare à crayon” is a custom instrument for painting and playing music.
The idea behind “la Guitare à crayon” is to be able to paint and play music with the same instrument. It’s a custom USB guitar with open source software: namely, pure data (sound) and gimp (visual).
La Guitare à crayon is free hardware (as in “free speech” not “free beer”).
Hardware features:
- Accelerometer X-Axis (for example controlling the octave)
- Accelerometer Y-Axis (for example controlling an effect)
- 6 analog strings giving around 10 bits of resolution
- External input: 1 analog, 1 digital
- 4 positions switch
- 8 buttons
- 4 pots
- 1 piezo with velocity filter (for example trigging any sound)
- 1 ir distance sensor (+-6cm – +-20cm)
- 1 unuseful led (for tapping the bpm)
- Pressure-sensitive tablet
- Foot controller (using a led & a photoresistor)
- Foot switch (looper, change sound, …)
Software features:
- No driver (firmware & bootloader)
- Linux, Windows, Mac
- Pure Data poweful DSP (sample, soundfont, fx rack, multiple looper)
- Gimp for 2d (drawing, painting, photo, …)
- Gesture tracking on the tablet (linux only)
Work in progress:
- Converting an electric guitar to an electronic guitar
- Updating the firmware via http
- Bridge to Blender (3d)
via Hackaday
