int redLED=4;
int greenLED=2;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(redLED, OUTPUT);
  pinMode(greenLED, OUTPUT);
}

void loop() {
  
 // read the sensor value and store it in a variable
  int sensorReading=analogRead(A3); 
  // convert the sensor reading into a temperature value
  int celsius = 1 / (log(1 / (1023.0 / sensorReading - 1)) / 3950.0 + 1.0 / 298.15) - 273.15;
  
  if (celsius>35) {
    digitalWrite(greenLED, LOW);
    digitalWrite(redLED, HIGH);
    delay(500);
  }
  else {
    digitalWrite(redLED, LOW);
    digitalWrite(greenLED, HIGH);
  }
  // wait 5 seconds to read again
  delay(500);

}