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

#define trigPin 10
#define echoPin 9
#define DHTPIN A1 // Define the pin for the DHT22 sensor
#define DHTTYPE DHT22 // Define the type of the DHT22 sensor

DHT dht(DHTPIN, DHTTYPE); // Create an instance of the DHT class
LiquidCrystal_I2C lcd(0x27, 20, 4);

String dist, temp;
int adc = 0;


void setup() {
  lcd.init();
  dht.begin(); // Initialize the DHT22 sensor
  Serial.begin(9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(DHTPIN, INPUT);
  pinMode(4, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(2, OUTPUT);
  pinMode(A0, INPUT);
}

void loop() {

  adc = analogRead(0);

  int temperature = dht.readTemperature(); // Read the temperature in Celsius
  int humidity = dht.readHumidity(); // Read the humidity
  
  temp = "T: " + String(temperature) + "*C, H: " + String(humidity) + "%";

  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  long duration = pulseIn(echoPin, HIGH);
  int distance = duration / 58.2;  // Divide by 58.2 to convert duration to centimeters

  if (display(distance) == 0) {
    lcd.noBacklight();
    lcd.noDisplay();
  }
  else {
    lcd.backlight();
    lcd.display();
  }

  dist = "Distance: " + String(distance) + " cm";
  lcd.setCursor(0,1);
  // lcd.print(dist);
  Serial.println(dist);

  lcd.setCursor(0,0);
  lcd.print(temp);
  Serial.println(temp);
}

int display(int distance){

  if(distance >= 150 && distance < 200){
    digitalWrite(2, HIGH);
    digitalWrite(3, LOW);
    digitalWrite(4, LOW);
    return 1;
  }  
  else if(distance >= 100 && distance < 150){
    digitalWrite(3, HIGH);
    digitalWrite(2, LOW);
    digitalWrite(4, LOW);
    return 1;
  }
  else if(distance >= 50 && distance < 100){
    digitalWrite(4, HIGH);
    digitalWrite(3, LOW);
    digitalWrite(2, LOW);
    return 1;
  }
  else if(distance >= 200){
    digitalWrite(2, LOW);
    digitalWrite(3, LOW);
    digitalWrite(4, LOW);
    return 0;
  }
  else{
    digitalWrite(2, HIGH);
    digitalWrite(3, HIGH);
    digitalWrite(4, HIGH);
    return 1;
  }

}