int sensorPin = A0;   // select the input pin for the LM35 sensor
int digitalValue;  // variable to store the value coming from the sensor
float analogVoltage;
float temp;

void setup() {
  Serial.begin(9600);
}

void loop() {
  // Get the analog value from lm35 sensor and convert that value into digital value using ADC converter
  digitalValue = analogRead(sensorPin);
  Serial.print("digital value = ");
  Serial.print(digitalValue);        //print digital value on serial monitor
  //convert digital value to analog voltage
  //Analog voltage = digital value * (Vref/2^n – 1)
  //Here Vref is 5V that we connected to lm35 sensor.If we connect 3.3V to sensor then Vref is 3.3V
  //Here we use 10 bit ADC so n=10 bits so the values ranges from 0 to 1023
  analogVoltage = (digitalValue * 5.00)/1023.00;
  Serial.print("  analog voltage = ");
  Serial.println(analogVoltage);
  //To convert analog voltage to temperature in Celcius, we multiply by 100 
  //because the LM35 output is 0.010V per degree. ie 1 degree =0.010V or 1V=100 degree
  temp=analogVoltage * 100;
  Serial.print("temperature = ");
  Serial.print(temp);
  Serial.println(" °C");  
  delay(10000);
}