todo:
- generate array of notes
- adapt piano code to feed from array of notes
- put motors inside the piano
- setup raspberry to send signal to arduino
- setup second motor
- test lighter motor
- buy pulley and tighten the rope properly
- figure out timing for testing (saturday)
- buy pulley - https://www.conrad.de/de/p/aluminium-zahnriemenscheibe-reely-bohrungs-6-mm-durchmesser-24-mm-anzahl-zaehne-10-226106.html
- calculate steps for stepper going up and down