#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16,2);
String data;
int relay1=5;
int relay2=16;
int relay3=2;
int relay4=4; 
void setup() {
  Serial.begin(9600);
  pinMode(relay1, OUTPUT);
  pinMode(relay2, OUTPUT);
  pinMode(relay3, OUTPUT);
  pinMode(relay4, OUTPUT);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);
   lcd.print("welcome to ");
   lcd.setCursor(0,1);
   lcd.print("home automation");
} 
void loop() {
 if(Serial.available()>0)
  {
    data=Serial.readString();
    Serial.println("data=");
    Serial.println(data);
    data.trim();
    if(data=="device1 on")
    {
      digitalWrite(relay1,HIGH);
      Serial.println("relay1 is on");
    }
    if(data=="device1 off")
    {
      digitalWrite(relay1,LOW);
      Serial.println("relay1 is off");
    }
     if(data=="device2 on")
    {
      digitalWrite(relay2,HIGH);
      Serial.println("relay2 is on");
    }
    if(data=="device2 off")
    {
      digitalWrite(relay2,LOW);
      Serial.println("relay2 is off");
    }
     if(data=="device3 on")
    {
      digitalWrite(relay3,HIGH);
      Serial.println("relay3 is on");
    }
    if(data=="device3 off")
    {
      digitalWrite(relay3,LOW);
      Serial.println("relay3 is off");
    }
     if(data=="device4 on")
    {
 digitalWrite(relay4,HIGH);
      Serial.println("relay4 is on");
    }
    if(data=="device4 off")
    {
      digitalWrite(relay4,LOW);
      Serial.println("relay4 is off");
    }
  }
  

}