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unit Encoder;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, OleCtrls, Phidget21COM_TLB, ComCtrls, ComObj, ActiveX;

type
  TForm1 = class(TForm)
    Label1: TLabel;
    Label2: TLabel;
    Label4: TLabel;
    TrackBar1: TTrackBar;
    procedure PhidgetEncoderPositionChange(ASender: TObject; Index, Time,
      EncoderDisplacement: Integer);
    procedure PhidgetEncoderDetach(Sender: TObject);
    procedure PhidgetEncoderAttach(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
  TrackBar1.Frequency := 50;
  TrackBar1.Min := -1000;
  TrackBar1.Max := 1000;
  Label2.Caption := 'Unattached';
  Label4.Caption := '';
  PhidgetEncoder.Open(-1);
  PhidgetEncoder.WaitForAttachment(3000);

end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  PhidgetEncoder.Enabled[0] := False;
  PhidgetEncoder.Close;

end;

procedure TForm1.PhidgetEncoderAttach(Sender: TObject);
begin
  Label2.Caption := 'Attached';
  PhidgetEncoder.Enabled[0] := True;
  PhidgetEncoder.EncoderPosition[0] := 0;
  TrackBar1.Position := 0;
end;

procedure TForm1.PhidgetEncoderDetach(Sender: TObject);
begin
  Label2.Caption := 'Unattached';
end;

procedure TForm1.PhidgetEncoderPositionChange(ASender: TObject; Index, Time,
  EncoderDisplacement: Integer);
begin
  TrackBar1.Position := TrackBar1.Position + EncoderDisplacement;
  Label4.Caption := IntToStr(PhidgetEncoder.EncoderPosition[0]);
end;

end.                    

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interface
type TForm1 = class(TForm)
  private
    PhidgetEncoder : TPhidgetEncoder;
  ...

end;
...

implementation
procedure TForm1.FormCreate(Sender: TObject);
begin
  TrackBar1.Frequency := 50;
  TrackBar1.Min := -1000;
  TrackBar1.Max := 1000;
  Label2.Caption := 'Unattached';
  Label4.Caption := '';
  PhidgetEncoder := TPhidgetEncoder.Create(...);
  PhidgetEncoder.Open(-1);
  PhidgetEncoder.WaitForAttachment(3000);

end;                    

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procedure TForm1.Destroy;
begin
  PhidgetEncoder.free;
end;