#define PIN_A_BUTTON 10
#define PIN_B_BUTTON 13

void setup()
{
  Serial1.begin(115200);

  pinMode(PIN_A_BUTTON, INPUT_PULLUP);
  pinMode(PIN_B_BUTTON, INPUT_PULLUP);
}

void loop()
{
  int stateA = digitalRead(PIN_A_BUTTON);
  int stateB = digitalRead(PIN_B_BUTTON);

  if (stateA == LOW)
  {
    Serial1.println("A pressed (Read: LOW)");
  }

  if (stateB == LOW)
  {
    Serial1.println("B pressed (Read: LOW)");
  }

  delay(20);
}