//  https://wokwi.com/projects/344892587898831442

//----  LCD 20X4 (I2C)
#include <LiquidCrystal_I2C.h>  // LCD 20X4 (I2C)
LiquidCrystal_I2C lcd(0X27, 20, 4);  // LCD 20X4 (I2C) can use address 0X3f

// -- DHT
#include "DHT.h"  // DHT
#define DHTPIN 2  //  DHTPIN is digital led pin 2 use for DHT22
#define DHTTYPE DHT22 // DHT
DHT dht(DHTPIN, DHTTYPE);  // DHT

// ---
#define dly1000 1000
#define d8 8  //  digital led pin 8 use Relay
#define d9 9  //  digital led pin 9 use PIR sensor


// --- Relay
int val;  // variable val for keep value output by digitalRead(d9) equiment Relay 

// --- DHT22 
int h;  //  Humidity
int t;  //  Temperature


//--- baurate for Serial monitor
void Sbaudrate() {

  Serial.begin(115200);

}
//---
void InitPinMode() {

  pinMode(d8, OUTPUT); // Relay
  pinMode(d9, INPUT);  // PIR sensor 
  pinMode(DHTPIN, INPUT);  // DHT22

}
//---
void InitDHT22() {

  dht.begin();

}
//---  DHT humidity/temperature sensors, display to Serial Monitor
void Dht22() { 

  h = dht.readHumidity();
  t = dht.readTemperature();

  val = digitalRead(d9);
  digitalWrite(d8, val);

  Serial.print("Hum: ");
  Serial.print(h);
  
  Serial.print(" Temp: ");
  Serial.println(t);

  delay(dly1000);

}
//----  LCD 20X4 (I2C),  display to LCD 20X4 (I2C)
void InitLCD20X4() {  // initialize LCD 20X4 (I2C)

  lcd.init();
  lcd.backlight(); 

}
// --- use LCD20X4 (I2C)
void UseLCD20X4() {  // initialize LCD 20X4 (I2C)

  h = dht.readHumidity();
  t = dht.readTemperature();
  
  val = digitalRead(d9);
  digitalWrite(d8, val);
  
  lcd.setCursor(0,0);
  lcd.print("Hum: ");
  lcd.print(h);
  lcd.print(" ");

  lcd.print(" Temp: ");
  lcd.print(t);
  lcd.print(" ");

}
//---
void setup() {

  Sbaudrate();  // Serial monitor
  InitPinMode(); // Set pinMode
  InitDHT22();   // DHT22
  InitLCD20X4();  // initialize LCD 20X4 (I2C)
  
}

void loop() {
 
  val = digitalRead(d9);

  Serial.println(val);
  digitalWrite(d8, val);

  Dht22();  // DHT
  UseLCD20X4(); // LCD 20X4 (I2C)

}