Arduino Accelerometer OTG USB

Arduino Accelerometer OTG Usb lets you use mobile accelerometer in the arduino . It is really easy to implement . Example Code and Project is given in the app. Using accelerometer module with arduino is either difficult also it contains alot of garbage values which require callibration .Then why not use mobile's accelrometer for arduino .It does not require callibration.
Why are we using usb otg cable for communication instead of bluetooth ? Well answer is very simple .
Advantages of USB OTG Cable over Bluetooth :
• OTG Cable is very cheap less than a dollar
• It consumes less power
• Easy to connect
• It is relatively fast than Bluetooth
Using Arduino with Android has many Application some them are mention below
1) Android Controlled CAR
2) Arduino Android Weather Station
3) Home Automation System
4) Line following Robot