const int buttonPin = 26; 
const int stepPin = 12; 
const int dirPin = 13; 
int buttonState = 0; 
int lastButtonState = 0;
bool isRunning = false;
int stepCount = 0;
int maxSteps = 1000; // Set your maximum steps here
int step_per_rev = 200; // Set your step for each rev

void setup () { 
  pinMode (stepPin,OUTPUT); 
  pinMode (dirPin,OUTPUT); 
  pinMode (buttonPin,INPUT); 
} 

void loop () { 
  buttonState = digitalRead (buttonPin); 
  if (buttonState != lastButtonState) {
    if (buttonState == HIGH) {
      isRunning = !isRunning;
      if (!isRunning && stepCount > 0) {
        digitalWrite(dirPin, LOW);
        while(stepCount > 0) {
          for(int i = 0; i < step_per_rev; i++) {
            digitalWrite(stepPin, HIGH);
            delayMicroseconds(500);
            digitalWrite(stepPin, LOW);
            delayMicroseconds(500);
            stepCount--;
            if(stepCount <= 0) {
              break;
            }
          }
        }
      }
    }
    delay(50); // debounce delay
  }
  lastButtonState = buttonState;

  if (isRunning && stepCount < maxSteps) { 
    digitalWrite (dirPin,HIGH); 
    for(int i = 0; i < step_per_rev; i++) {
      digitalWrite (stepPin,HIGH); 
      delayMicroseconds (500); 
      digitalWrite (stepPin,LOW); 
      delayMicroseconds (500); 
      stepCount++;
      if(stepCount >= maxSteps) {
        isRunning = false;
        break;
      }
    }
  } 
}