L298N Dual Motor Controller Module and Arduino

l298n-sample.c

const int IN1 = 7;
const int IN2 = 8;
const int ENA = 9;

void setup() {
  pinMode(IN1, OUTPUT);
  pinMode(IN2, OUTPUT);
  pinMode(ENA, OUTPUT);
}

void loop() {
  // forward
  digitalWrite(7, LOW);
  digitalWrite(8, HIGH);
  analogWrite(9, 80);
  delay(1000);
  // reverse
  digitalWrite(7, LOW);
  digitalWrite(8, HIGH);
  analogWrite(9, 80);
  delay(1000);
  // stop
  digitalWrite(7, HIGH);
  digitalWrite(8, HIGH);
  delay(1000);
}