   // Get and print temperature
   Serial.println("Getting temperatures...");
   sensors.requestTemperatures();
-  tempC = sensors.getTempC(firstThermometer);
+  temp1C = sensors.getTempC(firstThermometer);
+  temp2C = sensors.getTempC(secondThermometer);
 
   // Get and print battery voltage
   Serial.println("Getting voltage...");

  // Make message, e.g. "I:1 T:22.50 \n"
  messageString = "I:";
  messageString = messageString + String(messageId, DEC);
  messageString = messageString + " T:";
  if (tempC == -127.00) {
    Serial.println("Error getting temperature");
    messageString = messageString + "E";
  } else {
    messageString = messageString + String(tempC, 2);
  }
  messageString = messageString + " V:";
  messageString = messageString + String(vIn, 2);

OneWire oneWire(ONE_WIRE_BUS); // Setup a oneWire instance to communicate with any OneWire devices
DallasTemperature sensors(&oneWire); // Pass our oneWire reference to Dallas Temperature. 
DeviceAddress firstThermometer = { 0x28, 0xFF, 0xAD, 0x82, 0x61, 0x15, 0x02, 0xE8 }; // Assign the addresses of your 1-Wire temp sensors.
DeviceAddress secondThermometer = { 0x28, 0xFF, 0x6A, 0xB3, 0x64, 0x15, 0x01, 0x8B }; // Assign the addresses of your 1-Wire temp sensors.
String messageString = "";
int messageId = 0;
float temp1C = -127.00; //-127.00 is the error temp
float temp2C = -127.00; //-127.00 is the error temp
float vIn = 0.00;

void setup() {
