/* Joanne Leong
 * Bipolar Stepper Example
 * Using the 28BYG unipolar converted to bipolar motor 
 */

//#include <Stepper.h>

//Define GPIO Pins controlling the motor driver
#define DIR 17 
#define STEP 18 
#define M0 19
#define NSLEEP 21
#define LED 15

void setup() {
  pinMode(DIR, OUTPUT);
  pinMode(STEP, OUTPUT);
  pinMode(M0, OUTPUT);
  pinMode(NSLEEP, OUTPUT);
  pinMode(LED, OUTPUT);

  digitalWrite(DIR, HIGH);
  digitalWrite(M0, LOW); // 1/8 step mode
  digitalWrite(NSLEEP, HIGH); 
  //Serial.begin(115200);
}


  int delayus = 1000; //delay in microseconds
  int changetimer = 0;
  
  void loop() {
    //Manual PWM
    digitalWrite(STEP, HIGH);
    delayMicroseconds(delayus);
    digitalWrite(STEP, LOW);
    delayMicroseconds(delayus);
//
//    if (changetimer == 100) {
//      delayus++;
//      //Serial.println("changetimer");
//      if (delayus == 100) {
//        delayus = 10;
//      }
//      changetimer = 0;
//    }
//    
//    changetimer++;
  }