void setup() {
  pinMode(A1, INPUT);
  pinMode(PB0, OUTPUT);
  pinMode(PB1, OUTPUT);
  Serial.begin(9600);
  Serial.println("Testing...");
  analogReadResolution(10);
}

void loop() {

  const double BETA = 3950; // should match the Beta Coefficient of the thermistor
  double celsius = 1 / (log(1 / (1023. / analogRead(A1) - 1)) / BETA + 1.0 / 298.15) - 273.15;

  if (celsius >= 30 | celsius <= -20) {
    digitalWrite(PB0, HIGH);
    digitalWrite(PB1, LOW);
  } else {
    digitalWrite(PB1, HIGH);
    digitalWrite(PB0, LOW);
  }

  Serial.println(celsius);
  delay(100);
}