void setup() {
  // Begin serial communication at 9600 baud rate
  Serial.begin(9600);
  pinMode(2, OUTPUT);
}

void loop() {
  // Get the voltage reading from the LM35
  int reading = analogRead(34);

  // Convert that reading into voltage
  float voltage = reading * (5.0 / 4095.0);

  // Convert the voltage into the temperature in Celsius
  float temperatureC = voltage * 100;

  // Print the temperature in Celsius
  Serial.print("Temperature: ");
  Serial.print(temperatureC);
  Serial.println("°C");
  if(temperatureC>30){
    digitalWrite(2, HIGH);
  }
  else
   digitalWrite(2, LOW);

  delay(1000); // wait a second between readings
}
//https://lastminuteengineers.com/lm35-temperature-sensor-arduino-tutorial/