int buzzer=8;
int temperature_sensor=A2;
int value=0;
void setup() {
  // put your setup code here, to run once:
pinMode(temperature_sensor, INPUT);
pinMode(buzzer, OUTPUT);
Serial.begin(9600);
}
void loop() {
  value=analogRead(A2);
    Serial.println(value);
    //if temperature>25c
 if (value <512) {
    digitalWrite(buzzer, HIGH);
   tone(8, 262, 250);
  } else {
    digitalWrite(buzzer, LOW);
  }

Serial.end();
delay(200);
}