With this project you can control a unipolar stepper motor. You can control both the speed and the direction of the motor.

The speed and direction and can changed with help of the keypad. The data's are displayed over the LCD display.

A 4x4 keypad is used for entering the speed and selecting the direction.

Load the hex file into the chip, dont forget to select the internal oscillator at 10Mhz.

Then switch on the circuit and select the direction by pressing the corresponding key (Left or Right). Then enter the speed through the numeric keys and press the Enter key to start the operation. To switch off the motor press the separate switch which is connected to the port A.0

Proteus simulation file is also added with the download file, so that you can run the program on your desktop.

Circuit Diagram

Bascom Code

$regfile = "m16def.dat"
$crystal = 1000000

Config Kbd = Portb
Config Lcd = 16 * 2
Config Lcdpin = Pin , Db4 = Portc.4 , Db5 = Portc.5 , Db6 = Portc.6 , Db7 = Portc.7 , Rs = Portc.0 , E = Portc.1
Config Portd = Output
Config Porta = Input

Dim A As Byte , B As Byte , Key As Byte , C As Byte , D As Byte , E As Byte

Cls
Cursor Off

B = 0
D = 1

Q:
Locate 1 , 1
Lcd "Direction:"
Locate 2 , 1
Lcd "Speed:"
Do
'************Read Keyboard
A = Getkbd()
If A > 15 Then
   Goto Q
Else
   Key = Lookup(a , Dta)
     If Key <= 9 Then
           B = B * 10
           B = B + Key
'*************Direction
          If D = 0 Then Lcd B
                   Waitms 270
               Elseif Key = 10 Then
                   Locate 1 , 11
                   Lcd "Left"
                   C = 1
                   D = 0
                   B = 0

               Elseif Key = 11 Then
                  Locate 1 , 11
                  Lcd "Right"
                  C = 2
                  D = 0
                  B = 0
'****************reset
               Elseif Key = 13 Then
                  Cls
                  D = 1
                  B = 0
                  Portd.0 = 0
                  Portd.1 = 0
                  Waitms 50
                  Goto Q
'****************Enter key
               Elseif Key = 14 Then
                   If D = 0 Then
                       Select Case C
                          Case 1 : Gosub R
                          Case 2 : Gosub T
                       End Select

                   End If
         End If

End If

Wait 1

Loop

End

Dta:
Data 7 , 8 , 9 , 10 , 4 , 5 , 6 , 11 , 1 , 2 , 3 , 12 , 13 , 0 , 14 , 15

R:
Do
Portd = &B00000001 : Waitms B
Portd = &B00000011 : Waitms B
Portd = &B00000010 : Waitms B
Portd = &B00000110 : Waitms B
Portd = &B00000100 : Waitms B
Portd = &B00001100 : Waitms B
Portd = &B00001000 : Waitms B
Portd = &B00001001 : Waitms B
  If Pina.0 = 1 Then
      Locate 2 , 1
      Lcd "Speed:"
      B = 0
      Lcd B ; "          "
      Return
  End If

Loop

T:
Do
Portd = &B00001001 : Waitms B
Portd = &B00001000 : Waitms B
Portd = &B00001100 : Waitms B
Portd = &B00000100 : Waitms B
Portd = &B00000110 : Waitms B
Portd = &B00000010 : Waitms B
Portd = &B00000011 : Waitms B
Portd = &B00000001 : Waitms B
   If Pina.0 = 1 Then
       Locate 2 , 1
       Lcd "Speed:"
       B = 0
       Lcd B ; "          "
       Return
   End If

Loop

 

Download

Bascom code & Proteus simulation file