float temp;
int tempPin = 0;   // the output pin of LM35
int relay = 12;     // the pin where relay is
int led = 8;        // led pin
int tempset = 90;   // the temperature to start the relay
void readTemp();

//---------------------------------
void setup() {
  pinMode(relay, OUTPUT);
  pinMode(led, OUTPUT);
  //pinMode(tempPin, INPUT);
  Serial.begin(9600);
   
}
//---------------------------------
void loop() {  
   readTemp();     // get the temperature
   if(temp < tempset) {   // if temp is lower than tempset
       digitalWrite(relay, LOW);      
   }
   if(temp > tempset) {        // if temp is higher than tempset
       digitalWrite(relay, HIGH);  // turn on relay
       digitalWrite(led, HIGH);  // turn on led
   }
   

}
//---------------------------------
void readTemp() {  // get the temperature and convert it to celsius
  temp = analogRead(tempPin);
  temp = temp * 0.48828125;

Serial.print("TEMPRATURE = ");
Serial.print(temp);
Serial.print("*C");
Serial.println();
delay(1000);
  }