Stepper Motor Programming circuit schematc

Full Step Sequence:
I am using PIC16F628A with uln2003 to drive unipolar stepper motor. Adjusting the delay will increase or decrease the speed of the motor. Here just for demonstration i have taken some delay, you can change it as you want. If you want to change the direction of stepper motor, just reverse the step sequence (means 9,3,6, and C etc).

Code:

void delay();

void main(){

TRISB=0;

while(1){

PORTB = 0x0C;

delay();

PORTB = 0x06;

delay();

PORTB = 0x03;

delay();

PORTB = 0x09;

delay();

}

}

void delay(){

int i;

for(i=0;i<3000;i++);

}

Schematic:

PIC16F628A Stepper Motor Driver

Half Step Sequence:
Delay is same and main routine is like:


Code:
void main(){
while(1){



PORTB = 0x08;
delay();
PORTB = 0x0C;
delay();
PORTB = 0x04;
delay();
PORTB = 0x06;
delay();
PORTB = 0x02;
delay();
PORTB = 0x03;
delay();
PORTB= 0x01;
delay();
PORTB= 0x09;
delay();
}
}


2-Wire Connection:
Delay routine is same. Schematic is here.


Code:
void main(){
while(1){
PORTB = 0x03;
delay();
PORTB = 0x01;
delay();
PORTB = 0x00;
delay();
PORTB = 0x02;
delay();
}}