const int mundur = 5; 
const int maju = 4; 
int direction = 2;   
int step = 3; 
int time = 20000;

void setup() 
{
  Serial.begin(9600);
  pinMode(mundur, INPUT_PULLUP);
  pinMode(maju, INPUT_PULLUP);
  pinMode(direction, OUTPUT);
  pinMode(step, OUTPUT);
  digitalWrite(direction, LOW);
  digitalWrite(step, LOW);
}
void loop() 
{
  int berlawananjarum = digitalRead(mundur);
  int searahjarum = digitalRead(maju);
   if(berlawananjarum == LOW)
  {
    delay(250);
    if(berlawananjarum == LOW)
    {
      digitalWrite(direction, LOW); 
      do
      {
        digitalWrite(step, HIGH);
        delayMicroseconds(time);
        digitalWrite(step, LOW);
        delayMicroseconds(time);
        berlawananjarum = digitalRead(mundur); 
      }
      while(berlawananjarum != HIGH);
    }
  }
  if(searahjarum == LOW)
  {
    delay(250);
    if(searahjarum == LOW)
    {
      digitalWrite(direction, HIGH); 
      do
      {
        digitalWrite(step, HIGH);
        delayMicroseconds(time);
        digitalWrite(step, LOW);
        delayMicroseconds(time);
        searahjarum = digitalRead(maju); 
      }
      while(searahjarum != HIGH);
    }
  }
}