 String inputString = "";         // a String to hold incoming data
 boolean stringComplete = false;  // whether the string is complete
 
+float system_voltage = -1;
 
 void setup() {
   Serial.begin(115200);

  lcd.setCursor(0,2);
  lcd.write("S:        T:        ");
  lcd.setCursor(0,3);
  lcd.write("IN:   V  TEMP:    C ");
}

void loop() {
  if (stringComplete) {
    //message are in the form K - Message
    //where K is
    //P - Temp
    //I - IP
    //S - Steering
    //T - Throttle

        break;
        
      default: 
        message = "";
      break;
    }
    lcd.print(message);
