float cTemp;
int pins[6]= {0, 4, 5, 16, 17, 18};
bool btnStatus = true;

void setup() {
  //LED bar initialization
  set_output(pins);
  
  //NTC init
  pinMode(25, INPUT);

  //Button init
  pinMode(27, INPUT);
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
}

void set_output(int pins[6]){
  for(int it = 0; it<6; ++it) {
    pinMode(pins[it], OUTPUT);
  }  
}

void alarm()
{
  set_high(pins);
  delay(1000);
  set_low(pins);
  delay(1000);
  Serial.println("Alarm");
}

void set_high(int pins[6]){
  for(int it = 0; it<6; ++it) {
    digitalWrite(pins[it], HIGH);
  }
}

void set_low(int pins[6]){
  for(int it = 0; it<6; ++it) {
    digitalWrite(pins[it], LOW);
  }
}

void setLedBar(int currentTemerature, int targetTemperature)
{
  if(currentTemerature + 10 < targetTemperature) 
    digitalWrite(18, LOW);
  else digitalWrite(18, HIGH);
  if(currentTemerature + 5 < targetTemperature) 
    digitalWrite(5, LOW);
  else digitalWrite(5, HIGH);
  if(currentTemerature < targetTemperature) 
    digitalWrite(17, LOW);
  else digitalWrite(17, HIGH);
  if(currentTemerature -5 < targetTemperature) 
    digitalWrite(16, LOW);
  else digitalWrite(16, HIGH);
  if(currentTemerature -10 < targetTemperature) 
    digitalWrite(4, LOW);
  else digitalWrite(4, HIGH);
  if(currentTemerature -15 < targetTemperature) 
    digitalWrite(0, LOW);
  else digitalWrite(0, HIGH);
}

float getTemperature(int analogValue)
{
  float BETA = 3950; // should match the Beta Coefficient of the thermistor
  float celsius = 1 / (log(1 / (4095.0 / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;
  return celsius;
}

void setBtnStatus()
{
  btnStatus = digitalRead(27)==LOW;
}

void loop() {
  cTemp = getTemperature(analogRead(25));
  setBtnStatus();
  if(btnStatus && cTemp < 75.0){
    setLedBar(cTemp, 55);
  }
  else{
    if(cTemp > 75.0) alarm();
    else set_low(pins);
  }
  delay(10); // this speeds up the simulation
}