////App for work work with BT module (for example HC-05)

////My simple cod for Arduino with HC-05:

int pinFan = 5;
boolean stateFan = false;
double curentTemp;
int smartControl = 0;

void setup() {
  Serial.begin(9600);
  pinMode(pinFan, OUTPUT);
  pinMode(13, OUTPUT);
  boolean led = false;
}

void loop() {
  int sensorTemp = analogRead(A0);
  curentTemp = (sensorTemp * (120.0 / 1023.0)); //текущая температура ОЖ
  sendTempToSmart(curentTemp);
  controlFan(curentTemp);
  //smartControl = readDataFromSmart(); //тут аккуратнее
    digitalWrite(13, HIGH);
    delay(1500);
    digitalWrite(13, LOW);
    delay(1500);
}

void sendTempToSmart(double t){
  Serial.print("temp = "); Serial.println(t);
  Serial.print("state fan = "); Serial.println(stateFan);
  }

void controlFan(double t){
  if(smartControl == 0){
    if((t > 97.0) and (stateFan == false)){
      stateFan = true;
      digitalWrite(pinFan, HIGH);
    }
    if((t < 90.0) and (stateFan == true)){
      stateFan = false;
      digitalWrite(pinFan, LOW);
    }
  }else{
    stateFan = true;
    digitalWrite(pinFan, HIGH);
  }
}
int readDataFromSmart(){
  int d;
  if(Serial.available())
    d = Serial.read();
  return d;
}