This looks like a lovely project, thank you. I've always found it frustrating when people demonstrate chords on the piano and I'm unable to clearly see which keys they are showing, so this nicely solves that. Also, it may be possible to create a program that could post-process video footage and partially recover the MIDI!
Anyhoo, I have a couple of questions:
- which LED strip type did you use (Neopixel, DotStar, other)? (I read that some cannot work with the RPi because of timing instability)
- what density did you find works for you (e.g. LEDs/metre = 30, 60, 144, other)?
- what power adapter did you use?
- did you measure the current or power consumption in use? What was it?