         Serial.print((int) sensorData.tempIn);
         Serial.print(' ');
         Serial.print((int) sensorData.tempOut);
+        Serial.print(' ');
+        Serial.print((int) sensorData.battery);
         Serial.println();
         serialFlush();
     #endif

#define DEBUG      1     // set to 1 to display each loop() run
#define BAUD_RATE  57600

#define APIN_LDR        1  // data connection for photocell
#define DPIN_ONEWIRE    3  // data connection for the Dallas OneWire bus
#define DPIN_HALL       7  // data connection for hall effect
#define DPIN_RF_LED     9  // led indicating rf traffic
#define LED_DELAY       500

#define MEASURE_PERIOD  100 // how often to measure, in tenths of seconds
#define RETRY_PERIOD    10  // how soon to retry if ACK didn't come in

            byte door;    // door sensor: 0..1
            int tempIn;   // temperature: -500..+500 (tenths)
            int tempOut;  // temperature: -500..+500 (tenths)
            int battery;  // battery voltage
        };
    };
};
