/*****************************************************
*  * 湖南创乐博智能科技有限公司
* name:Humiture Detection 
* function:you can see the current value of humidity and temperature displayed on the I2C LCD1602.
******************************************************/

//include the libraries
#include <dht.h>
#include <LiquidCrystal_I2C.h>
#include <Wire.h> 
LiquidCrystal_I2C lcd(0x27,16,2); // set the LCD address to 0x27 and 0x3F for a 16 chars and 2 line display

dht DHT;//create a variable type of dht

const int DHT11_PIN= 7;//Humiture sensor attach to pin7

void setup()
{
 Serial.begin(9600);//initialize the serial
 lcd.init(); //initialize the lcd
 lcd.backlight(); //open the backlight 
}

void loop()
{
 // READ DATA
 //Serial.println("DHT11:");
 
D: int chk = DHT.read22(DHT11_PIN);//read the value returned from sensor
 switch (chk)
 {
 case DHTLIB_OK: 
  //Serial.println("OK!"); 
  break;
 case DHTLIB_ERROR_CHECKSUM: 
  //goto D;
  //Serial.print("Checksum error,\t"); 
  break;
 case DHTLIB_ERROR_TIMEOUT: 
   goto D;
  //Serial.print("Time out error,\t"); 
  break;
 default: 
  // goto D;
  //Serial.print("Unknown error,\t"); 
  break;
 }
 // DISPLAY DATA
 lcd.setCursor(0, 0);
 lcd.print("Tem:");
 Serial.print("Tem:");
 lcd.print(DHT.temperature+1,1); //print the temperature on lcd 
 Serial.print(DHT.temperature,1);
 lcd.print(char(223));//print the unit" ℃ "
 lcd.print("C");
 Serial.println(" C");
 lcd.setCursor(0, 1);
 lcd.print("Hum:");
 Serial.print("Hum:");
 lcd.print(DHT.humidity,1); //print the humidity on lcd
 Serial.print(DHT.humidity,1);
 lcd.print(" %"); 
 Serial.println(" %");
 delay(200); //wait a while 
}