Hybrid Piano

s_piano

New member
A few years back I started building a hybrid piano with Teensy 4.1 and other components – analog and digital.

Hybrid = acoustic piano action + digital midi controller + other software features. Yamaha and Kawai sell hybrid pianos, but I wanted to build my own.

Recently all 88 piano keys are working, using a Kawai grand piano action.

I got in the habit of making a YouTube video documenting each development step (and mistakes). But since I now play the piano more than work on it, the pace of videos may slow down.

Fragments of project are on GitHub. On my to-do list is improving GitHub content - code, pcb, etc.

Project links:

https://github.com/gzweigle/DIY-Grand-Digital-Piano

https://github.com/gzweigle/Piano-Data

https://www.youtube.com/@gzpiano88




The project is as much about experimenting as getting anything done. So, I’ve built two different functioning architectures and am working on a third approach. Here is a picture showing both types of boards connected to the piano action:

stem_piano_pjrc0.jpg

In the center is my lower performance board (rectangular). If fully populated, it uses two Teensy 4.1 and connects to all 88 keys.

Surrounding it are six of my higher performance boards (square). Each board connects to 8 keys and uses two Teensy 4.1. If I built a complete piano with these boards, it would require 88/8*2 = 22 Teensy 4.1, plus 2 for pedal unit for a total of 24 Teensy 4.1.


Side view of higher performance board, both Teensy 4.1 are visible in this picture:

stem_piano_pjrc2.jpg

Whenever I had a Teensy question, this forum and PJRC documentation pages answered them.
 
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