void forward(}{
analogWrite(ENA,carSpeed);
analogWrite(ENB,carSpeed);
digitalWrite(IN1,HIGH);
digitalWrite(IN2,LOW);
digitalWrite(IN3,LOW);
digitalWrite(IN4,HIGH);
serial.println("go forward!");
}
void back(}{
analogWrite(ENA,carSpeed);
analogWrite(ENB,carSpeed);
digitalWrite(IN1,LOW);
digitalWrite(In2,HIGH);

digitalWrite(IN3,HIGH);
digitalWrite(IN4,LOW);
serial.println("go back!");