#include "DHT.h"

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


//HC-Sr04 Pins
#define PIN_TRIG 12
#define PIN_ECHO 11

//Declaring the lcd
LiquidCrystal_I2C lcd(0x27, 16, 2);


//DHT Pin
#define DHTPIN 2     
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
DHT dht(DHTPIN, DHTTYPE);


//LED Pins
#define RED 4
#define ORANGE 5
#define GREEN 6


int state=RED;
int pins[]={RED,ORANGE,GREEN};


void setup() {
  // put your setup code here, to run once:

  //Setting UP the pins
  pinMode(RED, OUTPUT);
  pinMode(ORANGE, OUTPUT);
  pinMode(GREEN, OUTPUT);

  //Starting the DHT Sensor 
  dht.begin();

  //Starting the serial output
  Serial.begin(115200);
  Serial.println(F("Starting the Arduino !"));


  //The LCD Display
  lcd.begin(16,2);
  lcd.print("Hello World"); 
  lcd.backlight();

  //Distance measure
  pinMode(PIN_TRIG, OUTPUT);
  pinMode(PIN_ECHO, INPUT);

}

void loop() {
  // put your main code here, to run repeatedly:


  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }else{
      Serial.print(F("Humidity: "));
      Serial.print(humidity);
      Serial.print(F("%  Temperature: "));
      Serial.print(temperature);
      Serial.println(F("°C "));
    
    if(temperature<15){
      state=GREEN;
    }else if (temperature <30){
      state = ORANGE;
    }else{
      state = RED;
    }
    
    for(int i=0;i<3;i++){
      if(pins[i]==state){
        digitalWrite(pins[i],HIGH);
      }else{
        digitalWrite(pins[i], LOW);
      }
    }


    //Measuring the distance
    // Start a new measurement:
    digitalWrite(PIN_TRIG, HIGH);
    delayMicroseconds(10);
    digitalWrite(PIN_TRIG, LOW);

    // Read the result:
    int duration = pulseIn(PIN_ECHO, HIGH);
    Serial.print("Distance in CM: ");
    Serial.println(duration / 58);
    Serial.print("Distance in inches: ");
    Serial.println(duration / 148);

    //Writing to the LCD 
    lcd.clear();
    lcd.print(temperature);
    lcd.print("C ");
    lcd.print(humidity);
    lcd.print("%");
    lcd.setCursor(0,1);
    lcd.print(duration / 58);
    lcd.print("cm");
  }
  delay(500);

  
  

}