This helps you to connect any arduino to android phone with usb otg cable.It is very usefull method of communication between Arduino and android.Many people use Bluetooth for this purpose but otg cable has more advantages than Bluetooth .
• Very cheap
• It consumes less power
• Easy to Use
• Relatively fast than Bluetooth
With tis app you can use this UI and you can Change Password default password is 1234.
This app can be used as digital lock System.
This App Send "%"When Password Match.