function OnStart() { lay = app.CreateLayout( "Linear", "VCenter,FillXY" ); txt = app.CreateText( "", 0.8, 0.3 ); lay.AddChild( txt ); app.AddLayout( lay ); sns = app.CreateSensor( "Light" ); sns.SetOnChange( sns_OnChange ); sns.Start(); } function sns_OnChange( lux ) { txt.SetText( "level = " + lux + " lux" ); }