---

#define ENA 5
#define IN1 7
#define IN2 8

#define ENB 6
#define IN3 9
#define IN4 10

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

  pinMode(ENB, OUTPUT);
  pinMode(IN3, OUTPUT);
  pinMode(IN4, OUTPUT);

  stopMotors();
}

void loop() {

  // Вперёд
  forward(180);
  delay(2000);

  // Стоп
  stopMotors();
  delay(1000);

  // Назад
  backward(180);
  delay(2000);

  // Стоп
  stopMotors();
  delay(1000);

  // Поворот налево
  left(180);
  delay(1000);

  stopMotors();
  delay(1000);

  // Поворот направо
  right(180);
  delay(1000);

  stopMotors();
  delay(2000);
}

void forward(int speed) {
  digitalWrite(IN1, HIGH);
  digitalWrite(IN2, LOW);

  digitalWrite(IN3, HIGH);
  digitalWrite(IN4, LOW);

  analogWrite(ENA, speed);
  analogWrite(ENB, speed);
}

void backward(int speed) {
  digitalWrite(IN1, LOW);
  digitalWrite(IN2, HIGH);

  digitalWrite(IN3, LOW);
  digitalWrite(IN4, HIGH);

  analogWrite(ENA, speed);
  analogWrite(ENB, speed);
}

void left(int speed) {
  digitalWrite(IN1, LOW);
  digitalWrite(IN2, HIGH);

  digitalWrite(IN3, HIGH);
  digitalWrite(IN4, LOW);

  analogWrite(ENA, speed);
  analogWrite(ENB, speed);
}

void right(int speed) {
  digitalWrite(IN1, HIGH);
  digitalWrite(IN2, LOW);

  digitalWrite(IN3, LOW);
  digitalWrite(IN4, HIGH);

  analogWrite(ENA, speed);
  analogWrite(ENB, speed);
}

void stopMotors() {
  analogWrite(ENA, 0);
  analogWrite(ENB, 0);

  digitalWrite(IN1, LOW);
  digitalWrite(IN2, LOW);
  digitalWrite(IN3, LOW);
  digitalWrite(IN4, LOW);
}