Step Motor controlled with pullup button

Using Arduino Motors, Mechanics, Power and CNC
1

Helllo,
I am not programmer, ( beginner at best)
i just make many tries and errors..
i have a 28byj-48 stepper motor and unl2003 driver connected in arduino uno the 4 pin in 8,9,10,11, and the pullup button in pin 7,
My idea is to make a motor that by pressing a pull up button will make half rev and in the thes button press will make half but in the opposite direction..
until now this is arduino... i cant understand why it count but it doesnt rotate ?

#define sm1 8
#define sm2 9
#define sm3 10
#define sm4 11
#define button_pin 7

int Pins[] = {sm1,sm2,sm3,sm4};
int button_state = 0;
int button_i = 0;
int prev_button_state = 0;

void setup() {
  Serial.begin(9600);
  pinMode (button_pin, INPUT_PULLUP); 
  for (int x=8; x<11; x++){
    pinMode(x, OUTPUT);
  pinMode (13, OUTPUT);
  }
}

void loop() {
  button_state = digitalRead(button_pin);
  if (button_state != prev_button_state) {
    if (button_state == HIGH) {
      digitalWrite(13, LOW);
      if (button_i % 2 != 0) {
        delay(100);
        int seq[][4] = {{0,0,0,1},
                        {0,0,1,0},
                        {0,1,0,0},
                        {1,0,0,0}};

        for (int x=0; x<256; x++){
          for(int step1=0; step1<4; step1++){
            for(int pin=0; pin<4; pin++){
              digitalWrite(Pins[pin], seq[step1][pin]);
            }
            delayMicroseconds(25);
          }
        }
      }
      else{
        delay(100);
        int seq[][4] = {{1,0,0,0},
                        {0,1,0,0},
                        {0,0,1,0},
                        {0,0,0,1}};

        for (int x=0; x<256; x++){
          for(int step1=0; step1<4; step1++){
            for(int pin=0; pin<4; pin++){
              digitalWrite(Pins[pin], seq[step1][pin]);
            }
            delayMicroseconds(25);
          }
        }
      }
    }else {
      digitalWrite(13, HIGH);
      button_i++;
      Serial.println(button_i);
    }
  delay(50);
  }  
prev_button_state = button_state;
}
2

because arduino is not able to drive stepper motor directly

3

We can't either. How you suggest we find out?
Try and post schematics, no toy Fritzing pictures..
Also post links to the datasheet of driver, motor....

4

i have a 28byj-48 stepper motor and unl2003 driver connected in arduino uno the 4 pin in 8,9,10,11, and the pullup button in pin 7,

5 
// Sketch to turn around one unipolar Stepper motor with ULN2003 driver

const byte Pin0 = 8;
const byte Pin1 = 9;
const byte Pin2 = 10;
const byte Pin3 = 11;
byte Step = 1;
boolean dir = true;
void setup() {
  pinMode(Pin0, OUTPUT);
  pinMode(Pin1, OUTPUT);
  pinMode(Pin2, OUTPUT);
  pinMode(Pin3, OUTPUT);
}
void loop() {
  for (byte V = 0; V < 255; V++) {
    switch (Step) {
      case 1:
        digitalWrite(Pin0, LOW);
        digitalWrite(Pin1, LOW);
        digitalWrite(Pin2, LOW);
        digitalWrite(Pin3, HIGH);
        break;
      case 2:
        digitalWrite(Pin0, LOW);
        digitalWrite(Pin1, LOW);
        digitalWrite(Pin2, HIGH);
        digitalWrite(Pin3, HIGH);
        break;
      case 3:
        digitalWrite(Pin0, LOW);
        digitalWrite(Pin1, LOW);
        digitalWrite(Pin2, HIGH);
        digitalWrite(Pin3, LOW);
        break;
      case 4:
        digitalWrite(Pin0, LOW);
        digitalWrite(Pin1, HIGH);
        digitalWrite(Pin2, HIGH);
        digitalWrite(Pin3, LOW);
        break;
      case 5:
        digitalWrite(Pin0, LOW);
        digitalWrite(Pin1, HIGH);
        digitalWrite(Pin2, LOW);
        digitalWrite(Pin3, LOW);
        break;
      case 6:
        digitalWrite(Pin0, HIGH);
        digitalWrite(Pin1, HIGH);
        digitalWrite(Pin2, LOW);
        digitalWrite(Pin3, LOW);
        break;
      case 7:
        digitalWrite(Pin0, HIGH);
        digitalWrite(Pin1, LOW);
        digitalWrite(Pin2, LOW);
        digitalWrite(Pin3, LOW);
        break;
      case 8:
        digitalWrite(Pin0, HIGH);
        digitalWrite(Pin1, LOW);
        digitalWrite(Pin2, LOW);
        digitalWrite(Pin3, HIGH);
        break;
    }
    if (dir) Step++;
    else Step--;
    if (Step > 8)Step = 1;
    if (Step < 1)Step = 8;
    delay(2);
  }
  delay(1000);
}
6

Repeating what You already wrote doesn't add anything.

7

my goal is when i press the pull-up button, the first time (i=1)
the step motor will move half circle CW (180°),
then the motor will pause until i press again the button,
the second time (i=2)
the step motor will move half circle CCW (-180°)
then again will wait until the next press of the button
....
(i=odd) -> 180° CW
(i=even) ->-180° CCW

is it better explanation ?

8

How are you powering the stepper?

9

right now via USB (com3)
after i i will plug it (AC)

IMG_0097
IMG_00971494×1992 414 KB

10

That is quite likely the reason that your motor isn't rotating.

11

because it is connected via USB ?!
i tried the @kolaha version and it works (with AC or USB)
the problem wasnt with powering but i thing somewhere maybe my code has a flow..

12

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