arduino stuffs
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void setup()
{

  // Setup Channel A
  pinMode(12, OUTPUT); // Initiates Motor Channel A pin
  pinMode(9, OUTPUT);  // Initiates Brake Channel A pin

  // Setup Channel B
  pinMode(13, OUTPUT); // Initiates Motor Channel A pin
  pinMode(8, OUTPUT);  // Initiates Brake Channel A pin
}

void loop()
{

  // Motor A forward @ full speed
  digitalWrite(12, HIGH); // Establishes forward direction of Channel A
  digitalWrite(9, LOW);   // Disengage the Brake for Channel A
  analogWrite(3, 255);    // Spins the motor on Channel A at full speed

  // Motor B backward @ half speed
  digitalWrite(13, LOW); // Establishes backward direction of Channel B
  digitalWrite(8, LOW);  // Disengage the Brake for Channel B
  analogWrite(11, 123);  // Spins the motor on Channel B at half speed

  delay(3000);

  digitalWrite(9, HIGH); // Engage the Brake for Channel A
  digitalWrite(9, HIGH); // Engage the Brake for Channel B

  delay(1000);

  // Motor A forward @ full speed
  digitalWrite(12, LOW); // Establishes backward direction of Channel A
  digitalWrite(9, LOW);  // Disengage the Brake for Channel A
  analogWrite(3, 123);   // Spins the motor on Channel A at half speed

  // Motor B forward @ full speed
  digitalWrite(13, HIGH); // Establishes forward direction of Channel B
  digitalWrite(8, LOW);   // Disengage the Brake for Channel B
  analogWrite(11, 255);   // Spins the motor on Channel B at full speed

  delay(3000);

  digitalWrite(9, HIGH); // Engage the Brake for Channel A
  digitalWrite(9, HIGH); // Engage the Brake for Channel B

  delay(1000);
}