int ENA = 7; 
int IN1 = 9;
int IN2 = 5;
int ENB = 3; 
int IN3 = 6;
int IN4 = 10;
int pause = 40;


void setup() {
  pinMode(ENA, OUTPUT);    
  pinMode(IN1, OUTPUT); 
  pinMode(IN2, OUTPUT);
  pinMode(ENB, OUTPUT);    
  pinMode(IN3, OUTPUT); 
  pinMode(IN4, OUTPUT);
}

void loop() {
  digitalWrite(ENA, HIGH);
  digitalWrite(ENB, HIGH);
  
  digitalWrite(IN1, LOW);
  digitalWrite(IN2, LOW);  
  digitalWrite(IN3, LOW);  
  digitalWrite(IN4, LOW); //все на 0

 
for (int i=0; i <= 10; i++){
  digitalWrite(IN1, HIGH); // 1000
  delay(pause);
  digitalWrite(IN3, HIGH); // 1100
  delay(pause); 
  digitalWrite(IN1, LOW);  // 0100
  delay(pause);
  digitalWrite(IN2, HIGH); // 0110
  delay(pause);
  digitalWrite(IN3, LOW);  // 0010
  delay(pause);  
  digitalWrite(IN4, HIGH); // 0011
  delay(pause); 
  digitalWrite(IN2, LOW);  // 0001
  delay(pause);
  digitalWrite(IN1, HIGH); // 1001
  delay(pause);
  digitalWrite(IN4, LOW);  // 1000 
} 

  digitalWrite(IN1, LOW);
  digitalWrite(IN2, LOW);  
  digitalWrite(IN3, LOW);  
  digitalWrite(IN4, LOW); //все на 0

for (int i=0; i <= 10; i++){
  digitalWrite(IN4, HIGH); // 0001
  delay(pause);
  digitalWrite(IN2, HIGH); // 0011
  delay(pause); 
  digitalWrite(IN4, LOW);  // 0010
  delay(pause);
  digitalWrite(IN3, HIGH); // 0110
  delay(pause);
  digitalWrite(IN2, LOW);  // 0100
  delay(pause);  
  digitalWrite(IN1, HIGH); // 1100
  delay(pause); 
  digitalWrite(IN3, LOW);  // 1000
  delay(pause);
  digitalWrite(IN4, HIGH); // 1001
  delay(pause);
  digitalWrite(IN1, LOW);  // 0001
} 

}