Hello, I have a little problem in programming a stepper motor with PIC16f877A.
I'm not so familiar with programming, but I have an stepper motor wich I want to program to do a specific number of steps when an input signal is applied
to PORTB where I have 5 inputs buttons. In Proteus this code worked well, but when I made the circuit on breadboard, motor is only spinning clockwise.. and it not spinning only 50 steps as I specified in program, it just keep spinning as long as I keep the button for clockwise pushed, when the button for cclockwise is pressed, I got nothing.

I'm using ULN2003AN as steper motor driver and 28byj-48 motor.

The surce code is shown below:

int clockwise[]={0b00001100,0b00000110,0b00000011,0b00001001};
int cclockwise[]={0b00001001,0b00000011,0b00000110,0b00001100};
int i;
int y;
int a;
int count;
int k;


void main() {
       
TRISD = 0b00000000; // PORT D as output port
TRISB = 0b11111111; // PORT B as input port
PORTD = 0b00000000;
PORTB = 0b00110000;
k=0; //condition
do
{
if((PORTB.RB3==1||PORTB.RB1==1) && k==0 ) //buttons input
{
      k=1;
      a=50; // number of steps
      for(y=0;y<a;y++)
      {
        i=y%4;
        PORTD=clockwise[I];
        delay_ms(70); // speed
      }
}
else if((PORTB.RB5==0) && k==0) //buttons input
{
      k=1;
      a=50;
      for(y=0;y<a;y++)
      {
        i=y%4;
        PORTD=clockwise[I];
        delay_ms(40);
      }
}
  else
if((PORTB.RB4==1||PORTB.RB2==1) && k==1 )// buttons input
    {

    k=0;
    a=50;
    for(y=0;y<a;y++)
    {
    i=y%4;
    PORTD=cclockwise[I];
    delay_ms(70);
    }
    }

}
while(1);
}

Can you please help me?

Moderators note: used code tags

 

Do the buttons have pull-up resistors?
The '16F877 has weak pull-ups for port B but they are disabled by default.

 

Thank you for your reply, yes they do have pull-up resistors. I checked with multimeter and when I press cclockwise button, the voltage of the output pins of ULN2003 is 5V, all of them. I start to think is something wrong with the way I wired stepper motor to the driver

 

Lines 20 and 43 enable action when the buttons are NOT pressed. If the intended action is that nothing should happen until a button is pressed then change the conditions for RB1, RB2, RB3, and RB4 to '= 0'. Then let us know what happens.