L298N Motor Driver Controller Board

Controlling_Bipolar_Stepper_Motors_with_an_Arduino.ino

#define OUT1 4 //Digital 4 connect to L298 IN1
#define OUT2 5 //Digital 5 connect to L298 IN2
#define OUT3 6 //Digital 6 connect to L298 IN3
#define OUT4 7 //Digital 7 connect to L298 IN4
int motor_speed = 20; //delay 20 milliseconds (smaller is faster)
 
void setup() {
  pinMode(OUT1, OUTPUT);  
  pinMode(OUT2, OUTPUT);
  pinMode(OUT3, OUTPUT);  
  pinMode(OUT4, OUTPUT);   
}
 
void loop() { 
  step(1,0,0,0); //step 1 (L1 ON)
  step(0,0,1,0); //step 2 (L3 ON)
  step(0,1,0,0); //step 3 (L2 ON)
  step(0,0,0,1); //step 4 (L4 ON)
}
 
void step(int in1, int in2, int in3, int in4) {
  digitalWrite(OUT1, in1);
  digitalWrite(OUT2, in2);   
  digitalWrite(OUT3, in3);   
  digitalWrite(OUT4, in4);   
  delay(motor_speed);
}