int delay_long = 800;
int delay_short = 300;
const float BETA = 3950;
int val_r, val_g, val_b;
byte red = 3;
byte green = 5;
byte blue = 6;
void setup() {
  Serial.begin(9600);
  pinMode(red, OUTPUT);
  pinMode(green, OUTPUT);
  pinMode(blue, OUTPUT);
  pinMode(4, INPUT_PULLUP);

}

void loop() {
  int analogValue = analogRead(A0);
  float celsius = 1 / (log(1 / (1023. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;
  Serial.print("Temperature: ");
  Serial.print(celsius);
  Serial.println(" ℃");
  delay(10);
  if (celsius > 40.0) {
    digitalWrite(red, HIGH);
    digitalWrite(green, LOW);
    digitalWrite(blue, LOW);
  }
  if (celsius > 32.0 && celsius < 40.0) {
    digitalWrite(red, HIGH);
    digitalWrite(green, HIGH);
    digitalWrite(blue, LOW);
  }
  if (celsius > 10.0 && celsius < 32.0) {
    digitalWrite(red, LOW);
    digitalWrite(green, HIGH);
    digitalWrite(blue, LOW);
  }
  if (celsius < 10.0) {
    digitalWrite(red, LOW);
    digitalWrite(green, LOW);
    digitalWrite(blue, HIGH);
  }
  if (celsius <10.0 or celsius > 40.0) {
    digitalWrite(red, HIGH);
    digitalWrite(green, LOW);
    digitalWrite(blue, LOW);
    if (digitalRead(4) == LOW) {
      send_s(); Serial.print('S');
      delay(400);
      send_o(); Serial.print('O');
      delay(400);
      send_s(); Serial.print('S');
      delay(400); Serial.println('.');

    }
  }

}



void send_o() {
  for (int i = 0; i < 3; i++) {
    digitalWrite(3, HIGH);
    delay(delay_long);
    digitalWrite(3, LOW);
    delay(150);
  }
}

void send_s() {
  for (int i = 0; i < 3; i++) {
    digitalWrite(red, HIGH);
    delay(delay_short);
    digitalWrite(red, LOW);
    delay(150);
  }
}