// Example testing sketch for various DHT humidity/temperature sensors
// Tech at Home

#include "DHT.h"

#define DHTPIN 10     // what pin we're connected to

// Uncomment whatever type you're using!
// #define DHTTYPE DHT11   // DHT 11
#define DHTTYPE DHT22   // DHT 22  (AM2302)
//#define DHTTYPE DHT21   // DHT 21 (AM2301)
DHT dht(DHTPIN, DHTTYPE);
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

// Set the LCD address to 0x27 for a 16 chars and 2 line display
LiquidCrystal_I2C lcd(0x27, 16, 2);


int ldrPin = A3;
int led = 7;
int threshold = 70;

void setup() {
  Serial.begin(9600);
  Serial.println("DHTxx test!");
  pinMode(led, OUTPUT);

  dht.begin();

  lcd.begin(16,2);

  // Turn on the blacklight and print a message.
  lcd.backlight();
}

void loop() {
  // Wait a few seconds between measurements.
  delay(2000);

  // Reading temperature or humidity takes about 250 milliseconds!
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
  float h = dht.readHumidity();
  // Read temperature as Celsius (the default)
  float t = dht.readTemperature();
  // Read temperature as Fahrenheit (isFahrenheit = true)
  float f = dht.readTemperature(true);

  // Check if any reads failed and exit early (to try again).
  if (isnan(h) || isnan(t) || isnan(f)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
  float hif = dht.computeHeatIndex(f, h);
  float hic = dht.computeHeatIndex(t, h, false);

  Serial.print("Humidity: ");
  Serial.print(h);
  Serial.print(" %\t");

  Serial.print("Temperature: ");
  Serial.print(t);
  Serial.print(" *C ");
  Serial.print(f);
  Serial.print(" *F\t");

  Serial.print("Heat index: ");
  Serial.print(hic);
  Serial.print(" *C ");
  Serial.print(hif);
  Serial.println(" *F");

  int data = analogRead(ldrPin);
  Serial.print("Light Sensor ");
  Serial.print("Value = ");
  Serial.print(data);
  Serial.println("");

lcd.clear();
lcd.setCursor(0, 0); // Set the cursor to the first column of the first row
lcd.print("Temp: ");
lcd.print(t);
lcd.print(" *C");
delay(2500);
lcd.clear();


lcd.print("Humidity: ");
lcd.print(h);
lcd.print(" %");
delay(2500);
lcd.clear();

lcd.print("Heat Index: ");
lcd.print(hic);
lcd.print(" %");
delay(2500);
lcd.clear();

lcd.print("Ldr: ");
lcd.print(data);
lcd.print(" %");
delay(500);
}