3.3.3. Setting Up Motor Stepper Speed - Parallel Port

A basic example of stepper motor driver is shown in figure bellow. Notice the separate voltages for logic and for the stepper motor. Usually the motor will require a different voltage than the logic portion of the system. Typically logic voltage is +5 Vdc and the stepper motor voltage can range from +5 Vdc up to about +48 Vdc. The driver is also an "open collector" driver, wherein it takes its outputs to GND to activate the motor's windings.

Delphi Programming ( Download file ex333.zip )

a. Puts 4 Timers Components, 2 Button and label on Form, as shown in picture bellow. Setting up timer1..timer4 Timer component for Enabled = false, and Interval = 1000 ( approximataly = 1000 ms delay time ) and timer5 for Enabled = true.

procedure TSequence.Button1Click(Sender: TObject);
begin
 timer1.enabled:=true;
end;

procedure TSequence.Timer1Timer(Sender: TObject);
begin
timer1.enabled:=false;
 asm
  mov dx,$378
  mov al,11111110b
  out dx,al
 end;
timer2.enabled:=true;
end;

procedure TSequence.Timer2Timer(Sender: TObject);
begin
timer2.enabled:=false;
 asm
  mov dx,$378
  mov al,11111110b
  out dx,al
 end;
timer3.enabled:=true;
end;
procedure TSequence.Timer3Timer(Sender: TObject);
begin
timer3.enabled:=false;
 asm
  mov dx,$378
  mov al,11111110b
  out dx,al
 end;
timer4.enabled:=true;
end;

procedure TSequence.Timer4Timer(Sender: TObject);
begin
timer4.enabled:=false;
 asm
  mov dx,$378
  mov al,11111110b
  out dx,al
 end;
timer1.enabled:=true;
end;

procedure TSequence.Button2Click(Sender: TObject);
begin
 timer1.enabled:=false;
 timer2.enabled:=false;
 timer3.enabled:=false;
 timer4.enabled:=false;
end;

procedure TSequence.Timer5Timer(Sender: TObject);
begin
 case listbox1.itemindex of
 1:begin  {low speed}
    timer1.interval:=5000;
    timer2.interval:=5000;
    timer3.interval:=5000;
    timer4.interval:=5000;
   end;
  2:begin  {medium speed}
    timer1.interval:=2500;
    timer2.interval:=2500;
    timer3.interval:=2500;
    timer4.interval:=2500;
   end;
  3:begin  {high speed}
    timer1.interval:=1000;
    timer2.interval:=1000;
    timer3.interval:=1000;
    timer4.interval:=1000;
   end;
 end;
end;

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Delphi

Lesson 1
Delphi Programming
1.1. IDE Delphi
1.2. Component

Lesson 2
Printer Port / LPT
1.1.Basic
1.2.Address
1.3.Port Register
1.4.8 Bit Data Input
1.5.Test Circuitry
1.6.Assignment

Lesson 3
Printer Port / LPT
Experiments
3.1.LED
3.2.Swicht
3.3.Motor Stepper
3.4.DAC
3.5.ADC
3.6.Graph Display

Lesson 4
Serial Port
4.1.Basic
4.2.Hardware
4.3.Port Register

Lesson 5
Serial Port Experiments
5.1.LED
5.2.Stepper Motor
5.3.Swicht
5.4.ADC

Lesson 6
Game Port
Joy Stick
6.1. Basic
6.2. Experiments