// Meloodiate mängimine tone()-funktsiooniga

// Nootide sagedused (Hz):
// c = 262, d = 294, e = 330, f = 349
// g = 392, a = 440, b = 494, C = 523

const int buzzerPin = 9;

// Meloodia ja rütm
const int songLength = 18;
char notes[] = "cdfda ag cdfdg gf ";  // Noodid, ' ' = paus
int beats[] =  { 1,1,1,1,1,1,4,4,2, 1,1,1,1,1,1,4,4,2 };

int tempo = 150; // Mida väiksem, seda kiirem

void setup() {
  pinMode(buzzerPin, OUTPUT);
}

void loop() {
  for (int i = 0; i < songLength; i++) {
    int duration = beats[i] * tempo;

    if (notes[i] == ' ') {
      delay(duration); // Paus
    } else {
      int freq = getFrequency(notes[i]);
      tone(buzzerPin, freq, duration);
      delay(duration);
    }

    delay(tempo / 10); // Lühike paus nootide vahel
  }

  while (true) {} // Peatame loopi kordumise
}

// Funktsioon noodi sageduse leidmiseks
int getFrequency(char note) {
  const int numNotes = 8;
  char names[numNotes]      = { 'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C' };
  int  frequencies[numNotes] = { 262, 294, 330, 349, 392, 440, 494, 523 };

  for (int i = 0; i < numNotes; i++) {
    if (names[i] == note) {
      return frequencies[i];
    }
  }

  return 0; // Kui noot pole tuntud
}

#include <LiquidCrystal.h>

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

const int BUZZER_PIN = 8;
const int BUTTON_PIN = 13;
const int LED_PIN = 7;
const int PHOTO_PIN = A1;
const int TEMP_PIN = A0;
int lightLevel; 
float temp; 
bool isTemp = false;
int lastNum = 0;

bool systemEnabled = true;
bool alarm = false;
bool lastAlarm = false;
int lastButtonState = HIGH;

const float ALARM_TEMP = 25.0;
const int ALERM_SILINCE_LIGHT  = 800;
unsigned long alarmLcdTime = 0;
unsigned long lastAlarmSound = 0;

unsigned long lastTempCheck = 0;
const unsigned long TEMP_DELAY = 5;

void setup() 
{
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT);
  
  noTone(BUZZER_PIN);
  
  lcd.begin(16, 2);
  Serial.begin(9600);  
  
  delay(500);
  lcd.setCursor(0, 0);
  lcd.print("Alarm System");
  for(int i = 0; i < 16; i++)
  {
    lcd.setCursor(i, 1);
    lcd.write(1);
    delay(150);
  }
  
  lcd.clear();
}

float readTemp() 
{
  int sensorValue = analogRead(TEMP_PIN);
  float voltage = (sensorValue * 5.0) / 1023.0;
  float temperatureC = (voltage - 0.500) * 100.0;
  return temperatureC;
}

int readLight() 
{
  return analogRead(PHOTO_PIN);
}

void loop() 
{
  unsigned long seconds = millis() / 1000;
  temp = readTemp();
  lightLevel = readLight();
  int buttonState = digitalRead(BUTTON_PIN);  
  
  Serial.println("C: "+(String)temp
  +", Brightness: "+(String)lightLevel);
  
  if (buttonState == LOW && lastButtonState == HIGH) 
  {
    lcd.clear();
    systemEnabled = !systemEnabled;
    delay(100);
  }
  
  lastButtonState = buttonState;
  
  if(systemEnabled)
  {
	if (!alarm)
	{
		lcd.setCursor(0, 0);
		lcd.print("Alarm System ON");
	}
  }
  else
  {
	alarm = false;
    noTone(BUZZER_PIN);
	digitalWrite(LED_PIN, LOW);
    lcd.setCursor(0, 0);
    lcd.print("Alarm System OFF");
    return;
  }
  
  if( (temp >= ALARM_TEMP || lightLevel < ALERM_SILINCE_LIGHT ) && (seconds - lastTempCheck) > TEMP_DELAY)
  {
    alarm = true;
  }
  else if ((temp < ALARM_TEMP || lightLevel >= ALERM_SILINCE_LIGHT )) 
    alarm = false;
  
  if (lastAlarm != alarm)
  {
	  lastAlarm = alarm;
	  lcd.clear();
  }

  if(alarm)
  {
	if (alarmLcdTime < seconds)
	{
		lcd.clear();
		alarmLcdTime = seconds + 1;
		digitalWrite(LED_PIN, LOW);
	}
	else
	{
		lcd.setCursor(0, 0);
		lcd.print("Alarm!!!Alarm!!!");
		digitalWrite(LED_PIN, HIGH);
	}
	
	lcd.setCursor(0, 1);
	if(temp >= ALARM_TEMP)
		lcd.print("Temp liiga korge");
	else if (lightLevel < ALERM_SILINCE_LIGHT)
		lcd.print("Valg liiga nork");
	
	if(lastAlarmSound < seconds)
	{
		tone(BUZZER_PIN, 34, 200);
		lastAlarmSound = seconds + 1;
	}
  }
  else
  {
	noTone(BUZZER_PIN);
	digitalWrite(LED_PIN, LOW);
	lcd.setCursor(0, 1);
	lcd.print("C ");
	lcd.print(temp, 1);
	lcd.print(" Valg ");
	lcd.print(lightLevel);
  }
  
  delay(300);
}