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#define MOTOR_PIN_A 5
#define MOTOR_PIN_B 6
void setup() 
{
  pinMode(MOTOR_PIN_A, OUTPUT);
  pinMode(MOTOR_PIN_B, OUTPUT);
}
void loop() 
{
  //One direction
  digitalWrite(MOTOR_PIN_A, HIGH);
  digitalWrite(MOTOR_PIN_B, LOW);
  delay(5000);
  
  //The other direction
  digitalWrite(MOTOR_PIN_A, LOW);
  digitalWrite(MOTOR_PIN_B, HIGH);
  delay(5000);
}