// 
//
#define aref_voltage 5.0     // we tie 5V to ARef
#define ADC_RESOLUTION 1024.0
#define PIN_LM35       A0
int tempReading;             // the analog reading from the sensor

void setup() {
    // We'll send debugging information via the Serial monitor
    Serial.begin(9600);
    // the voltage applied to the AREF pin (0 to 5V only) is used as the reference
    analogReference(EXTERNAL);
    }
    
void loop() {
    tempReading = analogRead(PIN_LM35);
    Serial.print("Temp reading = ");
    Serial.print(tempReading);                 // the raw analog reading
    
    // converting that reading to voltage, which is based off the reference voltage
    float voltage = tempReading * aref_voltage;
    voltage /= ADC_RESOLUTION;
    
    // print out the voltage
    Serial.print(" - ");
    Serial.print(voltage); Serial.println(" volts");
    
    // LM34 now print out the temperature
    //float temperatureF = voltage * 100 ;       //converting from 10 mv (0.01 V) per degree
    //Serial.print(temperatureF); Serial.println(" degrees F");
    // Use below for LM35:
     float temperatureC = voltage * 100 ;
     Serial.print(temperatureC); Serial.println(" degrees C");
    
    // LM34: now convert to Celsius
    //float temperatureC = (temperatureF - 32.0) * (5.0 / 9.0);
    //Serial.print(temperatureC); Serial.println(" degrees C");
    // Use below for LM35:
     float temperatureF = (temperatureC * 9.0 / 5.0) + 32.0;
     Serial.print(temperatureF); Serial.println(" degrees F");
    delay(1000);
}