A sketch to drive an Arduino car with an L298N and 2 DC motors (with drive functions)

arduino-l298n-drive-functions.ino

/* 2 MOTOR L298N and Potentiometer 
*  with functions (forward, reverse, turnRight, turnLeft)
*  motor rotation will vary depending on the DC motor wiring 
*  and the orientation of the motor relative to the car/surface.
*
*/

//motor 2
#define enA 9
#define in1 6
#define in2 7


////motor 2
#define in3 5
#define in4 4
#define enB 3 //pwm for motor 2

//potentiometer
#define pot A0
int potVal = 0;


void setup() {

  // Set all the motor control pins to outputs
  pinMode(enA, OUTPUT);
  pinMode(enB, OUTPUT);
  pinMode(in1, OUTPUT);
  pinMode(in2, OUTPUT);
  pinMode(in3, OUTPUT);
  pinMode(in4, OUTPUT);

  pinMode(pot, INPUT);
   
  Serial.begin(9600);

  //initialize off
//  digitalWrite(in1, LOW);
//  digitalWrite(in2, LOW);
//  digitalWrite(in3, LOW);
//  digitalWrite(in4, LOW);

}

void loop() {

  potVal = analogRead(pot);
  Serial.println(potVal);

  potVal = map(potVal, 0, 1023, 0, 255);
  
  analogWrite(enA, potVal);
  analogWrite(enB, potVal);

 forward();
 delay(3000); //go forward 3 seconds

 reverse();
 delay(3000); //go reverse 3 seconds

 turnRight();
 delay(3000);

 turnLeft();
 delay(3000);
 
}

void forward(){
   //motor 1
   digitalWrite(in1, HIGH);
   digitalWrite(in2, LOW);
   //motor 2
   digitalWrite(in3, HIGH);
   digitalWrite(in4, LOW);
}

void reverse(){

  //motor 1
   digitalWrite(in1, LOW);
   digitalWrite(in2, HIGH);
  //motor 2
   digitalWrite(in3, LOW);
   digitalWrite(in4, HIGH);

}

void turnLeft(){

   digitalWrite(in1, HIGH);
   digitalWrite(in2, LOW);

   digitalWrite(in3, LOW);
   digitalWrite(in4, HIGH);

  
}


void turnRight(){

   digitalWrite(in1, LOW);
   digitalWrite(in2, HIGH);

   digitalWrite(in3, HIGH);
   digitalWrite(in4, LOW);

  
}