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| Experiment 5. Stepper Motor Drive |
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| The Experiment 5 we will test Use PIC16F628 to Drive Stepper Motor, for Article & Types of Stepping Motors you and see links as Resources ,Tools & Related Menu below |
This Experiment use Unipolar Motors 9-24 V 7.5 Degree/Step , and use IC ULN2003 for Drive |
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Figure 5.1 schematic for Experiment 5 Stepper Motor Drive |
| Assemble circuit as figure 5.1 and Download Program to PIC16F628 from Figure 5.1 VR 100k use for adjust frequency clock of PIC16F628 when run in mode ER |
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| Source Code For Experiment 5 |
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| list p= 16 f 628 |
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; list directive to define processor |
| #include <p 16 f 628. inc> |
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; processor specific variable definitions |
| __CONFIG _CP_OFF & _WDT_OFF & _BODEN_ON & _PWRTE_ON & _ER_OSC_NOCLKOUT & _MCLRE_ON & _LVP_OFF |
| COUNT |
equ |
0 x 20 |
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| DUMMY 1 |
equ |
0 x 21 |
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| DUMMY 2 |
equ |
0 x 22 |
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org |
0 x 000 |
; Reset Vetor Address |
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bsf |
STATUS,RP 0 |
; Set RB 4- RB 7 For Drive Stepper Motor |
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movlw |
b' 00001111 ' |
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movwf |
PORTB |
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bcf |
STATUS,RP 0 |
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| Begin |
movlw |
.12 |
; Loop 12 Time For 7.5 Degree/Step |
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; 4x12x7.5 = 360 |
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movwf |
COUNT |
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| Loop |
movlw |
b' 00010000 ' |
; 1 Phase Full Step |
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movwf |
PORTB |
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call |
Delay |
; Change Delay For Change Speed |
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movlw |
b' 00100000 ' |
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movwf |
PORTB |
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call |
Delay |
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movlw |
b' 01000000 ' |
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movwf |
PORTB |
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call |
Delay |
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movlw |
b' 10000000 ' |
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movwf |
PORTB |
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call |
Delay |
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decfsz |
COUNT,f |
; Check Loop = 12 Time ? |
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goto |
Loop |
; If Not Loop Again |
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movlw |
.12 |
; Reverse Move 12 Time |
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movwf |
COUNT |
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| Loop 2 |
movlw |
b' 01000000 ' |
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movwf |
PORTB |
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call |
Delay |
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movlw |
b' 00100000 ' |
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movwf |
PORTB |
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call |
Delay |
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movlw |
b' 00010000 ' |
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movwf |
PORTB |
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call |
Delay |
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movlw |
b' 10000000 ' |
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movwf |
PORTB |
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call |
Delay |
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decfsz |
COUNT,f |
; Check Loop = Time ? |
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goto |
Loop 2 |
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goto |
Begin |
; If Yes Start Again |
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| Delay |
movlw |
0 x 20 |
; Delay Between Step |
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movwf |
DUMMY 1 |
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| Delay 1 |
clrf |
DUMMY 2 |
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decfsz |
DUMMY 2 ,f |
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goto |
$-1 |
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decfsz |
DUMMY 1 ,f |
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goto |
Delay 1 |
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return |
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END |
; end of program |
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Name List |
Quantity |
MPLAB |
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PIC16F628 |
1 |
4 MHz Crystal |
1 |
Push Button Switch 1 PC |
1 |
33 pF Capacitors |
2 |
4.7K Resistors |
1 |
47K Resistors |
1 |
100K Variable Resistors( VR) |
1 |
ULN2003 |
1 |
Unipolar Motors |
1 |
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| Resources ,Tools & Related |
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