float data1, data2;

void setup() {
  Serial2.begin(115200);
}

void loop() {

  data1 = pox.getHeartRate(); // HR
  data2 = pox.getSpO2();      // O2
  Serial2.print(data1, 2); Serial2.print("A");
  Serial2.print(data2, 2); Serial2.print("B");
  Serial2.print("\n");
}//end of loop