Analog temperature sensor LM335

// demo sketch for connecting LM335 temperature sensor to Z-Uno

// pin connection lm335
#define PIN_LM335 A0
// supply voltage (if USB - 3.05 V)
float V=3.05;

// set up channel
ZUNO_SETUP_CHANNELS(
   ZUNO_SENSOR_MULTILEVEL(ZUNO_SENSOR_MULTILEVEL_TYPE_TEMPERATURE, 
                          SENSOR_MULTILEVEL_SCALE_CELSIUS, 
                          SENSOR_MULTILEVEL_SIZE_TWO_BYTES, 
                          SENSOR_MULTILEVEL_PRECISION_ONE_DECIMAL,
                          getterTemp)
);

int temp;  // here we will store the temperature

void setup() {
    Serial.begin();
    Serial.println("start");  
}

void loop() {
    // obtaining readings from the sensor lm335
    temp = getTemplm335();
    Serial.print("temp = ");
    Serial.println(temp);    
    // send data to channel
    zunoSendReport(1);     
    // send every 30 second
    delay(30000);
}

int getTemplm335() {
    int val;
    
    val = analogRead(PIN_LM335);
    temp = ((float)val*V*100/1024-273.15)*10;
    return temp;
}

word getterTemp() {
    return temp;
}