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int IN1Pin = 3;
int IN2Pin = 4;
int ENPin = 5;
void setup() {
  pinMode(IN1Pin, OUTPUT);
  pinMode(IN2Pin, OUTPUT);
  analogWrite(ENPin, 255); //Max Speed
}

void loop() {   
  //Go
  digitalWrite(IN1Pin, HIGH);
  digitalWrite(IN2Pin, LOW);
  delay(5000);//5sec

  //Back
  digitalWrite(IN1Pin, LOW);
  digitalWrite(IN2Pin, HIGH); 
  delay(5000);//5sec
 
  //Brake (Stop)
  digitalWrite(IN1Pin, HIGH);
  digitalWrite(IN2Pin, HIGH);
  delay(5000);//1sec
}