AccelTooth

With this basic app you can send accelerometer reading via bluetooth to your Arduino or other micro controller that has a bluetooth shield or module. It sends raw data of the axis you want, and you can customize the header of the entire message and each axis. You can also send a calibration message so your receiver knows what reading that is supposed to be zero.
The bluetooth device needs to be paired with the phone before use.
You have to configure the connection between the BT-device and uC yourself.