#define ADC_VREF_mV    5000.0 // in millivolt
#define ADC_RESOLUTION 4096.0
const int LM35 = 15;

void setup()
{
 pinMode(LM35, INPUT);  
 Serial.begin(115200);
}
void loop() {
 int ADC;
 float temp;
 ADC = analogRead(LM35);
 float milliVolt = ADC * (ADC_VREF_mV / ADC_RESOLUTION);
 temp = milliVolt / 10;
 //temp = (temp / 3.999);
 Serial.print("Temperature = ");
 Serial.print(temp);
 Serial.println(" °C");
 delay(1000);
}