28BYJ-48 Stepper esp8266 (Pins D5,D6,D7,D8)

Stepper.ino

// 28BYJ-48 Stepper esp8266


// Steps for stepping and performing 1/2 steps
char steps[8] =
{
 0x01,//  1
 0x03,//  12
 0x02,//   2
 0x06,//   23
 0x04,//    3
 0x0c,//    34
 0x08,//     4
 0x09,//     41
};


// Full stepper mode using two phase for more torque
char steps_full[4] =
{
 0x03,//  12
 0x06,//   23
 0x0c,//    34
 0x09,//     41
};

int stepper_gpio[4] = {
 14, // D5 | GPIO14
 12, // D6 | GPIO12
 13, // D7 | GPIO13
 15, // D8 | GPIO15
};

int spos = 0 ;

void move(int up){
  //find the next position. for up simply do a +1. for a step down
  //add size -1 to the current pos (modulus substraction)
  spos = ((up )?spos+ 1: spos + sizeof(steps) -1)  % sizeof(steps);

  for (int i =0 ; i < 4; i++){
    digitalWrite(stepper_gpio[i], (steps[spos] >> i ) & 1);
  }  
}

void setup() {
  for (int i =0 ; i < 4; i++){
    pinMode(stepper_gpio[i], OUTPUT);
  }
}

void loop() {
  move(1);
  delay(10);
}