const int DIR = 12;
const int STEP = 14;
int nbstep , timeto;

void setup()
{
  Serial.begin(115200);
  pinMode(STEP, OUTPUT);
  pinMode(DIR, OUTPUT);
}
void loop()
{
  aspirate(48,1200); 
  delay(1000);
  //2K =2.5cm
  eject(48,1200);
  delay(1000);
}

void aspirate(int nbstep,int timeto){
  digitalWrite(DIR, HIGH);
  Serial.println("Aspiration");
  
  for(int i = 0; i<nbstep; i++)
  {
    digitalWrite(STEP, HIGH);
    delayMicroseconds(timeto);
    digitalWrite(STEP, LOW);
    delayMicroseconds(timeto);
  }
}

void eject(int nbstep,int timeto){
  digitalWrite(DIR, LOW);
  Serial.println("Ejection");

  for(int i = 0; i<nbstep; i++)
  {
    digitalWrite(STEP, HIGH);
    delayMicroseconds(timeto);
    digitalWrite(STEP, LOW);
    delayMicroseconds(timeto);
  }
}