/* How to use the DHT-22 sensor with Arduino uno
   Temperature and humidity sensor
*/

//Libraries
#include <DHT.h>;
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

//i2c pins
LiquidCrystal_I2C lcd(0x27, 16,2 ); //


//Constants
#define DHTPIN 7     // what pin we're connected to
#define DHTTYPE DHT22   // DHT 22  (AM2302)
DHT dht(DHTPIN, DHTTYPE); //// Initialize DHT sensor for normal 16mhz Arduino


//ldr variable declaring
const int ledPin = 5; // digital pin 5 
const int ldrPin = A0; // analog pin 0


//Variables
int chk;
float hum;  //Stores humidity value
float temp; //Stores temperature value

void setup()
{
  Serial.begin(9600);
  dht.begin();
  lcd.backlight();//Power on the back light
  lcd.init();
  pinMode(ldrPin, INPUT); // Here LDR sensor is determined as input

}

void loop()
{
    delay(2000); //DELAY before starting loop

    //Read data and store it to variables hum and temp
   hum = dht.readHumidity();
   temp= dht.readTemperature();
 
  //  Print temp and humidity values to serial monitor

  //humidity
    Serial.print("Humidity: ");
   Serial.print(hum);
   lcd.setCursor(0,0); //we start writing from the first row first column
    lcd.print("Humidity:");
  lcd.print(hum);
    lcd.print("%"); //16 characters poer line
    delay(1000);

    //temperature
    Serial.print(" %, Temp: ");
   Serial.print(temp);
    Serial.println(" Celsius");
lcd.setCursor(0,1);
lcd.print("Temp:");
  lcd.print(temp);
    lcd.print("C");

    delay(10000); //Delay 2 sec.

    int ldrStatus = analogRead(ldrPin); //reading data from ldr sensor  by analog pin

if (ldrStatus <= 200) {digitalWrite(ledPin, HIGH); // If LDR senses darkness led pin high that means led will glow.
Serial.print("Darkness over here,turn on the LED :");
Serial.println(ldrStatus);
} else {
digitalWrite(ledPin, LOW); // If LDR senses light led pin low that means led will stop glowing.
Serial.print("There is sufficient light , turn off the LED : ");
Serial.println(ldrStatus);

lcd.clear();//Clean the screen



    //Write your text:

}}