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# emonica

Electronic MIDI harmonica: you blow into it, a slider picks the note. Low-cost, easy to build and open source. Entered in the 2018 Hackaday Prize (Musical Instrument Challenge). Inspired by the Millioniser 2000 from the early 80s.

emonica: black 3D-printed case with six buttons, an OLED display and a slider
emonica version 1.0 – printed case, six buttons, OLED, slider

How it works

  • MPXV5010GP pressure sensor detects blowing and drawing and calibrates itself at startup.
  • A slider with two fork light sensors selects the note position.
  • Above a pressure threshold the device sends MIDI notes, optionally MIDI CC (e.g. filter or expression).
  • Scale, root and top note, channel and eight presets are adjustable.
OLED display showing blow level, current note and preset
Display: blow level, current note, preset

Hardware

Teensy 3.2 · 0.96" OLED (I²C) · 6 tactile switches · 2 fork light sensors · MPXV5010GP · 3D-printed case · PCB optional (perfboard works too).

Links

--hackaday --github