#include "RTClib.h"
#include <LiquidCrystal_I2C.h>
#include "DHT.h"
dht DHT;
#define DHT22_PIN 5
#define DHTTYPE DHTTYPE
#define I2C_ADDR  0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4
LiquidCrystal_I2C lcd(I2C_ADDR,LCD_COLUMNS,LCD_LINES);
RTC_DS1307 rtc;
int relay1=2;
char daysoftheweek[7][12]={"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};
struct {
  uint32_t total;
  uint32_t ok;
  uint32_t crc_error;
  uint32_t time_out;
  uint32_t connect;
  uint32_t ack_l;
  uint32_t ack_h;
  uint32_t unknown;
} stat = { 0, 0, 0, 0, 0, 0, 0, 0};
void setup() {
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(3,0);
  lcd.print("welcome to");
  lcd.setCursor(2,1);
  lcd.print("smart agriculture");
  lcd.setCursor(5,2);
  lcd.print("irigation");
  lcd.setCursor(7,3);
  lcd.print("system");

lcd.clear();
if(! rtc.begin()){
  Serial.println("couldn't find RTC");
  Serial.flush();
  abort();
{
  Serial.begin(115200);
  Serial.println("dht22_test.ino");
  Serial.print("LIBRARY VERSION: ");
  Serial.println(DHT_LIB_VERSION);
  Serial.println();
  Serial.println("Type,\tstatus,\tHumidity (%),\tTemperature (C)\tTime (us)");
}

}
}

void loop() {
 DateTime now = rtc.now();
 lcd.setCursor(3,0);
 lcd.print("Time:");
 lcd.print(now.hour(),DEC);
 lcd.print(":");
 lcd.print(now.minute(),DEC);
 lcd.print(":");
 lcd.print(now.second(),DEC);
 delay(500);
 if((now.second()>=37 )&&(now.second()<=38))
 {
  Serial.println("relay1 is on");
  digitalWrite(relay1, HIGH);
  lcd.setCursor(0,1);
 lcd.print("RELAY1:ON");
 lcd.setCursor(10,1);
 lcd.print("RELAY2:");
 lcd.setCursor(0,2);
 lcd.print("RELAY3:");
 lcd.setCursor(10,2);
 lcd.print("RELAY4:");
 }
 else
 {
  Serial.println("relay1 is off");
  digitalWrite(relay1,LOW);
  lcd.setCursor(0,1);
 lcd.print("RELAY1:OFF");
 lcd.setCursor(10,1);
 lcd.print("RELAY2:");
 lcd.setCursor(0,2);
 lcd.print("RELAY3:");
 lcd.setCursor(10,2);
 lcd.print("RELAY4:");
 }

}
 {
  // READ DATA
  Serial.print("DHT22, \t");

  uint32_t start = micros();
  int chk = DHT.read22(DHT22_PIN);
  uint32_t stop = micros();

  stat.total++;
  switch (chk)
  {
    case DHTLIB_OK:
      stat.ok++;
      Serial.print("OK,\t");
      break;
    case DHTLIB_ERROR_CHECKSUM:
      stat.crc_error++;
      Serial.print("Checksum error,\t");
       break;
    case DHTLIB_ERROR_TIMEOUT:
      stat.time_out++;
      Serial.print("Time out error,\t");
      break;
    case DHTLIB_ERROR_CONNECT:
      stat.connect++;
      Serial.print("Connect error,\t");
      break;
    case DHTLIB_ERROR_ACK_L:
      stat.ack_l++;
      Serial.print("Ack Low error,\t");
      break;
    case DHTLIB_ERROR_ACK_H:
      stat.ack_h++;
      Serial.print("Ack High error,\t");
      break;
    default:
      stat.unknown++;
      Serial.print("Unknown error,\t");
      break;
  }
    Serial.print(DHT.humidity, 1);
  Serial.print(",\t");
  Serial.print(DHT.temperature, 1);
  Serial.print(",\t");
  Serial.print(stop - start);
  Serial.println();

  if (stat.total % 20 == 0)
  {
    Serial.println("\nTOT\tOK\tCRC\tTO\tCON\tACK_L\tACK_H\tUNK");
    Serial.print(stat.total);
    Serial.print("\t");
    Serial.print(stat.ok);
    Serial.print("\t");
    Serial.print(stat.crc_error);
    Serial.print("\t");
    Serial.print(stat.time_out);
    Serial.print("\t");
    Serial.print(stat.connect);
    Serial.print("\t");
    Serial.print(stat.ack_l);
    Serial.print("\t");
    Serial.print(stat.ack_h);
    Serial.print("\t");
    Serial.print(stat.unknown);
    Serial.println("\n");
  }
  delay(2000);
}