So you have your BT sorted out?

I use a BT chip on my boards with no converter. I have the BT chip running at 3.3v just like the PIC.

I am not sure what you are meaning by handheld device but if you are using a BT chip, look into making the app work on your Android phone.

Look into Basic4Android. Its a piece of cake to use. The wireless side is a bit cumbersome but once you get it going, its pretty slick. I use it to make an app to control up to 48 electrical motors sending data back and forth from the motor control boards to a tablet all wirelessly.

http://www.basic4ppc.com/index.html

If you get try it and need some help, email me at [email protected]