This is a prototype of my electronic musical instrument. It uses touch sensors for buttons, can simulate different instruments: saxophone, flute, drums, trumped, steel drums.
Basically it's a programmable controller which can be whatever you want it to be. 18 touch sensors, a touchscreen, MIDI sinthesyzer, Bluetooth.
The total cost of parts is about $15, not including the case, which is just 2 printed circuit boards.

Watch my YouTube video about it
This is my video about pitch recognition

Here is the source code for the program:

If you have any questions or want to help me to make and sell this thing:

I'm going to put more details about the program and components here soon.

And this is the old and ugly prototype