float temp;
int temppin =A0;
int led=2;

void setup() {
 Serial.begin(9600);
 pinMode(led, OUTPUT);
 pinMode(temppin, INPUT);

}

void loop() {
 temp=analogRead(temppin);
 temp=temp*0.48828125;
 Serial.print("TEMPRETURE =");
 Serial.print(temp);
 Serial.print("C");
 Serial.println();
 delay(1000);
 if(temp>30)
 {digitalWrite(led, HIGH);
 }
 else{
  digitalWrite(led, LOW);
 }

}