/* Program 7-2 Read the analog value of the pin connected to the temperature sensor.
 * The temperature sensor on is connected to pin A2.
 * The temperature sensor is an LM45, The value is scaled to degree F  
 * then sent to the Serial monitor. 
 */
const int temp = A2;
void setup() {
    Serial.begin(9600);
    Serial.println("Temperature sensor:");
}

void loop() {
    /* read the voltage from ADC */
    int tempValue = analogRead(temp);
    
    /* write it to the Serial monitor */
    Serial.print("  Temperature = ");
    Serial.print(tempValue);
    Serial.print(", ");
    float degreeC = (float)tempValue / 1023 * 5 / 0.01;
    Serial.print(degreeC, 2);
    Serial.print(" C, ");
    float degreeF = degreeC * 9.0 / 5.0 + 32;
    Serial.print(degreeF, 2);
    Serial.println(" F");
}