// Trabalho 2 MIcrocontroladores - Victor Filgueiras Santana //

#include <Wire.h>
#include <LiquidCrystal.h>

const int buttonPin = 2;
const int greenLedPin = 9;  
const int redLedPin = 10; 
const int buzzerPin = 13;  
const float BETA = 3950;

int buttonState = 0;  
bool isCelsius = true;
LiquidCrystal lcd(12,11,7,6,5,4);

void setup() {
  Serial.begin(9600);
  pinMode(buttonPin, INPUT);
  pinMode(greenLedPin, OUTPUT);
  pinMode(redLedPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);

  lcd.begin(16, 2);
  lcd.print("Temp: ");
}


void loop() {
  
  buttonState = digitalRead(buttonPin);
  
  float tempCelsius = readTemperature();

  float tempFahrenheit = isCelsius ? celsiusToFahrenheit(tempCelsius) : tempCelsius;

  Serial.print("Temperatura: ");
  Serial.print(tempCelsius);
  Serial.print(" Celsius, ");
  Serial.print(tempFahrenheit);
  Serial.println(" Fahrenheit");

  lcd.setCursor(7, 0);
  lcd.print(tempCelsius);
  lcd.print(" C");

  updateLEDsAndAlarm(tempCelsius);

  delay(1000);
}

float readTemperature() {
  int analogValue = analogRead(A0);
  float tempCelsius = 1 / (log(1 / (1023. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;
  return tempCelsius;
}

float celsiusToFahrenheit(float celsius) {
  return celsius * 9 / 5 + 32;
}

void updateLEDsAndAlarm(float temperature) {

  if (temperature <= 30) {
    digitalWrite(greenLedPin, HIGH);
  } else {
    digitalWrite(greenLedPin, LOW);
  }

  if (temperature > 35) {
    digitalWrite(redLedPin, HIGH);
    activateAlarm();
  } else {
    digitalWrite(redLedPin, LOW);
    noTone(buzzerPin);
  }
}

void activateAlarm() {

  tone(buzzerPin, 1000); 
}