How to make a big instruments who interacts with body?

:slight_smile: feeeling desasperated.

What i need?
i want movement to make sound. Like if you out your hands up, a violin sounds.
Or some like that...

Check

or in general get inspiration from - https://www.sparkfun.com/categories/23?page=all -

To get better support you should write in far more detail what you want to make (requirements)

Furthermore I advise you strongly to spent time in the tutorial section and g through all the sketches to learn how the Arduino language works and how to interact with sensors etc.

This might give you some ideas: http://en.wikipedia.org/wiki/Theremin