Issues with making portable battery powered uno project (Theremin)

Using Arduino Project Guidance
1

I want to build a handheld theremin. Im aware of OPEN THEREMIN project.

I assume that hand holding the unit would get in the way of using the body as a capacitor.

and the need to ground the uno board.

sorry Im a newb.

Using a proximity sensor would get around this I assume.

any general thoughts appreciated.

cheers

Jeff

2

I assume that hand holding the unit would get in the way of using the body as a capacitor.

Does the touch input of your smartphone work while holding it in the hand? It uses a capacitive sensor to read your inputs.

and the need to ground the uno board.

It makes sensing easier but it isn't necessary as above example shows.