const int LEFT_DIR_PIN = 7;
const int LEFT_SPEED_PIN = 6;
const int RIGHT_DIR_PIN = 4;
const int RIGHT_SPEED_PIN = 5;
const int FORWARD = HIGH;

int speed = 100;

void setup() {
  pinMode(LEFT_DIR_PIN, OUTPUT);
  pinMode(LEFT_SPEED_PIN, OUTPUT);
  pinMode(RIGHT_DIR_PIN, OUTPUT);
  pinMode(RIGHT_SPEED_PIN, OUTPUT);

  digitalWrite(LEFT_DIR_PIN, FORWARD);
  digitalWrite(RIGHT_DIR_PIN, FORWARD);
  analogWrite(LEFT_SPEED_PIN, speed);
  analogWrite(RIGHT_SPEED_PIN, speed);
  delay(1000);

  analogWrite(LEFT_SPEED_PIN, 0);
  analogWrite(RIGHT_SPEED_PIN, 0);
}

void loop() {
}