void setup() 
{
  Serial.begin(115200);
  pinMode(8,OUTPUT);
  pinMode(9,OUTPUT);
}

void loop() 
{
  Serial.println("Forward");
  digitalWrite(8,HIGH);
  digitalWrite(9,LOW);
  delay(1000);

  Serial.println("Backward");
  digitalWrite(8,LOW);
  digitalWrite(9,HIGH);
  delay(1000);
}