PWM DC Motor Control with Potentiometer and L298N

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//The code belongs to this tutorial video: https://youtu.be/8a5k_q0Bu7M
/*
 * Controlling a DC motor with a potmeter
 * Starting the program and stopping the program with Serial
 * Use 24V power supply at max; control power with potmeter for PWM
 * Connect arduino GND to L298N GND -> Motor will stall otherwise
 *
 */

/*
You can also support me by buying the parts using the following links:
L298N Dual H-bridge DC Motor Driver: https://www.banggood.com/custlink/vmmv0oOv4O
DC Motor with Planetary Gear: https://www.banggood.com/custlink/KmD34jOG4A
DC Motor 3500-9000 RPM: https://www.banggood.com/custlink/Dm3DBoO3gf
Arduino UNO: https://www.banggood.com/custlink/33KKF85c3i
Variable Power Supply: https://www.banggood.com/custlink/DGKvSpwFvQ
Linear Slide Potentiometer:https://www.banggood.com/custlink/Gm3DiDNLtk
*/

int potPin = 0;                    // select the input pin for the potentiometer (A0)
int val = 0;                       // variable to store the value coming from the sensor
char receivedCommand;              // character for controlling the serial program
//---------------Motor
const int pinA = 8;               //Enable (Power)
const int enA = 5;                //Enable (PWM) '~'
//-------------------
bool runningEnabled = false;
bool newData = false;


void setup()
{
  pinMode(pinA, OUTPUT);
  pinMode(enA, OUTPUT);
  Serial.begin(9600);
  Serial.println("DC-MOT-POT");
}

void loop()
{
readSerialPort();
readPotmeter();
}

void readSerialPort()
{
  if (Serial.available() > 0) //is there a data on the serial?
     {
        receivedCommand = Serial.read();
        newData = true; //if we received a new command we set this bool to true
     }

     if (newData == true)
     {
          if(receivedCommand == 's') //Start
            {
              runningEnabled = true; //start = enable running
            }

          if(receivedCommand == 'n')//Stop
            {
              runningEnabled = false; //shut down everything
              digitalWrite(pinA, LOW);
            }
      }
        newData = false;  //reset newData to false so we can receive new command

}

void readPotmeter()
{
  if(runningEnabled == true) //is running is enabled?
  {
    val = analogRead(potPin);    // read the value from the pot (A0)
    val = map(val, 0, 1023, 0, 255); //map 0-1023 to 0-255 ; |-----------| ---> |------|
    analogWrite(enA, val); //write PWM (pin ~5)
    digitalWrite(pinA, HIGH); //enable power
    Serial.println(val); //print on serial
  }
  else
  { //do nothing, disable power if it was enabled previously
    runningEnabled = false;
    digitalWrite(pinA, LOW);
  }
}