// the value of the 'other' resistor
#define SERIESRESISTOR 10000    
 
// What pin to connect the sensor to
#define THERMISTORPIN A5 
 
void setup(void) {
  Serial.begin(9600);
  pinMode(3,OUTPUT);
}
 
void loop(void) {
  float reading;
  float temperature;
 
  reading = analogRead(THERMISTORPIN);
 
  // convert the value to resistance
  temperature = -0.225*reading+231.65;     // formula to convert analogue reading to temperature (Deg C)
  Serial.print("The temperature is "); 
  Serial.print(temperature);
  Serial.println(" Degrees C"); 
  Serial.println(" "); 
  delay(1000);
  if(temperature>23) 
  {
    Serial.println("HIGH TEMP, HEATER IS OFF");
    digitalWrite(3,LOW);
    digitalWrite(LED_BUILTIN, LOW);   // turn the LED on (LOW is the voltage level)
    
    delay(1000);
  }
  else{
  Serial.println("LOW TEMP, HEATER IS ON");
  digitalWrite(3,HIGH);
  digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  }
}