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//  mx1508 arduino ide example
//  By #Techn0man1ac

#define IN1 14 // left motor, PWM
#define IN2 13 // left motor
#define IN3 12 // right motor, PWM
#define IN4 15 // right motor

#define motorLeft 0
#define motorRight 1

int motrSpd = 0;  

void setup() {
  Serial.begin(115200);
  pinMode(IN1, OUTPUT); // PWM
  pinMode(IN2, OUTPUT);
  pinMode(IN3, OUTPUT); // PWM
  pinMode(IN4, OUTPUT);
}

void loop() {

  for (motrSpd = 0; motrSpd <= 255; motrSpd += 1) {
    speedMotors(motorRight, motrSpd);
    speedMotors(motorLeft, motrSpd);
    Serial.println(motrSpd);
    delay(15);
  }

  for (motrSpd = 255; motrSpd >= -255; motrSpd -= 1) {
    speedMotors(motorRight, motrSpd);
    speedMotors(motorLeft, motrSpd);
    Serial.println(motrSpd);
    delay(15);
  }

  for (motrSpd = -255; motrSpd <= 0; motrSpd += 1) {
    speedMotors(motorRight, motrSpd);
    speedMotors(motorLeft, motrSpd);
    Serial.println(motrSpd);
    delay(15);
  }
  delay(5000);
}

void speedMotors(int motor, int spd)
{

  if (motor == motorLeft) {
    if (spd >= 0) {
      analogWrite(IN1, spd);
      digitalWrite(IN2, LOW);
    } else {
      spd = 255 + spd;
      analogWrite(IN1, spd);
      digitalWrite(IN2, HIGH);
    }
  } else {
    if (spd >= 0) {
      analogWrite(IN3, spd);
      digitalWrite(IN4, LOW);
    } else {
      spd = 255 + spd;
      analogWrite(IN3, spd);
      digitalWrite(IN4, HIGH);
    }
  }
}