/**
 * Prototype
 * Arduino Duemilanove
 * L298N shield V03
 * 
 * Pin 13 = motor A or coil A +
 * Pin 12 = motor A or coil A –
 * Pin 11 = motor B or coil B +
 * Pin 10 = motor A or coil A enable
 * Pin 9 = motor B or coil B enable
 * Pin 8 = motor B or coil B –
 **/

#define Apos 13
#define Aneg 12
#define Aenable 10

void setup() {
  pinMode(Apos, OUTPUT);
  pinMode(Aneg, OUTPUT);
  pinMode(Aenable, OUTPUT);
}

void loop() {
  clockwise();
  set_speed(50); 
  delay(5000);
  brake();
  delay(2000);
  counter_clockwise();
  set_speed(100);
  delay(5000);
  brake();
  delay(2000);
}

//input value from 0 to 255
void set_speed (int val){ 
  analogWrite(Aenable, val);
}

void clockwise(){
  digitalWrite(Apos, HIGH);
  digitalWrite(Aneg, LOW);  
}

void counter_clockwise(){
  digitalWrite(Apos, LOW);
  digitalWrite(Aneg, HIGH);  
}

void brake (){
  digitalWrite(Aenable, LOW);
}

/**
 * Vex = higher voltage that can power the motor and/or the shield as well as the Arduino if wanted
 * 5V = Must be a clean 5V that can power the Arduino and shield, and if wanted also the motor itself
 * GND = ass always, the ground of everything
 * B- = Connection of the first motor or first winding of the stepper motor
 * B+ = Connection of the first motor or first winding of the stepper motor
 * A- = Connection of the second motor or second winding of the stepper motor
 * A+ = Connection of the second motor or second winding of the stepper motor
 **/