Bluno nano project

dcmotor.ino

int motorPin1 = 5;
int motorPin2 = 9;

void setup()
{
  pinMode(motorPin1, OUTPUT);
  pinMode(motorPin2, OUTPUT);
  Serial.begin(115200);
}

int speedLeft = 0;
int speedRight = 0;

void loop() {
  if (Serial.available())
  {
    int val = Serial.read();
    if (val == 'L') {
      inc(&speedLeft);
      analogWrite(motorPin1, speedLeft);
    }
    else if (val == 'l') {
      dec(&speedLeft);
      analogWrite(motorPin1, speedLeft);
    }
    else if (val == 'R') {
      inc(&speedRight);
      analogWrite(motorPin2, speedRight);
    }
    else if (val == 'r') {
      dec(&speedRight);
      analogWrite(motorPin2, speedRight);
    }
    printBuf(speedLeft, speedRight);
  }
}

void inc(int *speed) {
  if (*speed < 250)
    *speed += 10;
}

void dec(int *speed) {
  if (*speed > 0 )
    *speed -= 10;
}

void printBuf(int s1, int s2) {
    char buf[10];
    Serial.write(itoa(s1, buf, 10));
    Serial.write(",");
    Serial.write(itoa(s2, buf, 10));
    Serial.write(" ");
}