int sensorValue = 0;
float vout = 0;
float cout = 0;
float max_c = 21.5;
float v_0 = 2.5;

void setup()
{
  pinMode(A0, INPUT);
   pinMode(12, OUTPUT);
  Serial.begin(9600);
  
}

void loop()
{
  // read the input on analog pin 0:
  sensorValue = analogRead(A0);
  vout = ((sensorValue * 5)/1023);
  cout = (vout*(max_c/v_0))-max_c;
  // print out the value 
  Serial.println(sensorValue);
  Serial.println(vout);
  Serial.println(cout);
 
  delay(500);
  if (sensorValue>500)
  {digitalWrite(12,HIGH);
  }
   if (sensorValue<500)
  {digitalWrite(12,LOW);
  }
}