#define TEMPPIN A1
#define LED 2

float temp;
float vout;

void setup() {
  // put your setup code here, to run once:
  pinMode(TEMPPIN, INPUT);
  pinMode(LED, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  temp = analogRead(TEMPPIN);
  //temp = (temp*500)/1023.0;
  //temp = (5.0*temp*100.0)/1024.0;
  //temp = (temp * (5.0 / 1024.0))* 100;
  temp = (5 * temp * 100.0) / 1024;
  Serial.println(temp);

  if(temp > 25){
    digitalWrite(LED, HIGH);
  }else{
    digitalWrite(LED, LOW);
  }
  //tempc = vout;
  delay(500);
}