fixing now my piano plays evenly

Building a custom hybrid digital piano, step by step.
Original and ongoing repository with software and hardware:
github.com/gzw...
GitHub organization with documentation and links in documentation to original repository:
github.com/ste...
0:00 - Playing piano - opening
0:58 - Piano action tolerance
1:10 - Horizontal sensor position
1:39 - Vertical sensor position
2:01 - Sensors (CNY70)
3:44 - Bad CNY70
3:50 - Crosstalk
4:42 - Shank angle
4:46 - Analog front end
4:50 - Reflective material
5:11 - Ambient light
5:25 - Testing after all changes
5:47 - Playing piano - closing