"MagneTrack" MIDI Instrument
Description
A magnetic-themed, MIDI-based instrument inspired by the cello and designed to be portable, intuitive, and tactile. (The name is a work in progress…) This device is designed around my big skeleton hands and likely won't fit many other people. It uses four buttons and three positions to play notes on a scale (that can be altered in the code). Magnetic pogo pins along a linear track with grounding connections (inputpullup) that snap onto the main hand communicate the main hand's current slide/fret position. The arm requires no active electronics. There's also a PSP joystick that's used to shift the notes up or down an octave and adjust the velocity of the MIDI signal. Assembly Notes: Please DM me if you're genuinely interested in building this and I'll write some elaborate instructions :) Printing Notes: •Printed in PLA at 0.2mm layer height with Tree Supports •Print 4x ‘Button Caps’ (Consider using something more durable than PLA, like PETG or enhanced PLA) Materials: •PLA •Solid Core Wire/Solder (for soldering to the pogo pins & kailh keys) •½ Breadboard •4x Kailh Choc keys (plug-shaped top) •PSP Joystick •40mm Stretchy fabric •2x segments for securing the rail to your arm •1x 20mm segment (cut in half) for the back of the main body •Arduino Pro Micro (or any 32U4-based microcontroller) •Android Phone with FluidSynth (+ appropriate connection cables/adapters) •3x 6x3mm Cylindrical Magnets •6mm diameter 150mm length High-Speed Steel (HSS) rod. Example: https://www.amazon.com/uxcell-Lathe-Round-Solid-Length/dp/B07SXGSQ82/ •5x M3 Nuts •2x M2 Nuts •3x 8mm M3 Screws •2x 12mm M3 Screws •2x 10+mm M2 Screws •4x Segments of a 20x20+mm Protoboard. Example: https://www.amazon.com/ELEGOO-Prototype-Soldering-Compatible-•Arduino/dp/B072Z7Y19F/ (The small, slim option) •A set of male/female (1x/3x) Magnetic pogo 3-pin connectors. Example: https://www.ebay.com/itm/355669899305?var=624771330440 Must be 4mm tall, 4x15mm footprint (in the example, snip the side tabs off) Future Improvements: •Wireless/battery powered using a Teensy 4.1 and Speaker/3.5mm Jack as output instead of using MIDI and a phone with FluidSynth. •Using 4-pin magnetic pogo pins set for 7 positions instead of just 3. This would open up the device to a more fret-based approach instead of simple 3 sets of 4 ascending notes. •Vibration LRA for more feedback about shifting between positions •Buttons that fit better and don't fall off a lot. •Maybe the use of a Wii Nunchuck in the right hand for even more controls/effects.
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