Other examples can be found on Instructables.
Involt basic tutorial. Send data from button inside app and toggle LED on your Arduino device.
2 Knobs 1 App
Involt basic tutorial. Receive data from potentiometers connected to analog pins on Arduino.
"Do a barrel roll"
JQuery basic tutorial. Connect two potentiometers and use them to rotate html element.
Involt as JQuery plugin
JQuery advanced tutorial. Create custom elements with JQuery methods.