   Serial.println("Getting temperatures...");
   sensors.requestTemperatures();
   tempC = sensors.getTempC(firstThermometer);
+
+  // Get and print battery voltage
+  Serial.println("Getting voltage...");
+  // 9v = 3.85, 6v = 2.55, 11.9v = 5.00 => k = 2.35, 
+  float Vin = 2.35 * (analogRead(1) * (5.0/1023.0));
   
-  // Make temperature message, e.g. "I:1 T:22.50 \n"
+  // Make message, e.g. "I:1 T:22.50 \n"
   messageString = "I:";
   messageString = messageString + String(messageId, DEC);
   messageString = messageString + " T:";

  } else {
    messageString = messageString + String(tempC, 2);
  }
  messageString = messageString + "\n";

  // Prepare and send message


#define LED_PIN_TX 13   // the number of the LED pin on the transmitter board
#define ONE_WIRE_BUS 3 // Data wire is plugged into pin 3 on the Arduino
#define Z1 600.0
#define Z2 220.0

RH_ASK driver;
OneWire oneWire(ONE_WIRE_BUS); // Setup a oneWire instance to communicate with any OneWire devices
