#include <Adafruit_Sensor.h>
#include <DHT.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

const int LED1 = 2;
const int LED2 = 3;
const int LED3 = 4;
const int buzzer = 9;
const int motorPin = 10;
const int fanPin = 11;
const int trig = 12;
const int echo = 13;

const int potentialPin = A0;

#define DHTPIN 5
#define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);

LiquidCrystal_I2C lcd(0x27, 16, 2);  // Address 0x27, 16 columns x 2 rows

float mapFloat(float x, float in_min, float in_max, float out_min, float out_max) {
  return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}

void setup() 
{
  pinMode(trig , OUTPUT);
  pinMode(echo , INPUT);
  
  pinMode(LED1 , OUTPUT);
  pinMode(LED2 , OUTPUT);
  pinMode(LED3 , OUTPUT);

  pinMode(buzzer, OUTPUT);
  pinMode(motorPin, OUTPUT);
  pinMode(fanPin, OUTPUT);
  
  Serial.begin(9600);

  dht.begin();
  lcd.backlight();
  lcd.begin(16, 2);    // Initialize the LCD (16 columns, 2 rows)
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("irene vtm");
  delay(500);
}

void loop()
{
  // controlul motorului
  int potential = analogRead(potentialPin);
  int speed = map(potential, 0, 1023, 0, 255);
  analogWrite(motorPin, speed);
  //Serial.println(speed);




  //controlul senzorului de parcare
  digitalWrite(trig , HIGH);
  delayMicroseconds(1000);
  digitalWrite(trig , LOW);

  int duration = pulseIn(echo , HIGH);
  int distance = (duration / 2) / 28.5;
  //Serial.println(distance);

  digitalWrite(LED1, distance <= 8  ? HIGH : LOW);
  digitalWrite(LED2, distance <= 16 ? HIGH : LOW);
  digitalWrite(LED3, distance <= 30 ? HIGH : LOW);

  if (distance < 8) {
    tone(buzzer, 1000);
  } else if (distance <= 16) {
    tone(buzzer, 600);
    delay(100);
    noTone(buzzer);       
    delay(100);
  } else {
    noTone(buzzer);
  }




  //controlul ventilatorului in fucntie de temperatura
  float temperature = dht.readTemperature();

  if (!isnan(temperature)) {
    int fanSpeed;
    if (temperature >= 26) {
      fanSpeed = mapFloat(temperature, 26, 30, 200, 255); 
    } else {
      fanSpeed = 0;
    }
    if (temperature >= 26) {
      Serial.println(temperature);
      //Serial.println(fanSpeed);
      fanSpeed = constrain(fanSpeed, 200, 255); //mentine viteza maxima si cand depaseste 30 celsius
      analogWrite(fanPin, fanSpeed);
    } else {
      analogWrite(fanPin, 0);
    }

    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Temp: ");
    lcd.print(temperature, 1);
    lcd.print("C");

    lcd.setCursor(0, 1);
    lcd.print("Fan: ");
    lcd.print(fanSpeed);
  } else {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Temp Error");
    Serial.println("Failed to read temperature from DHT22!");
  }

  delay(100); // Small delay to reduce flickering
}