With this app you can use your Android device as an shield for you Arduino Projects.With the use of Bluetooth connection you can send control commands through varios input modules, those include buttons, scrollbars and the accelerometer built-in on the Android device.You can even send text to a terminal on the app, just like an Lcd screen.In the Arduino scketch you can access these app inputs using the AndroidShieldPro library that can be downloaded here > https://drive.google.com/file/d/0B_34111latGhM0VqVGJueTFCZmc/view?usp=sharingIn the library you can attach some inputs directly to digital outputs of the Arduino and some Pwm outputs.For any ideas or criticism, feel free to comment.
Bluetooth Shield Arduino Pro
