#include <LiquidCrystal.h>
LiquidCrystal lcd(3,4,5,6,7,8);

int relay1 = A0;
int relay2 = A1;
int relay3 = A2;
int relay4 = A3;
String data;
void setup()
 {
  Serial.begin(9600);
  lcd.begin(16,2);
  lcd.setCursor(0,0);
  lcd.print("welcome to");
  lcd.setCursor(0,1);
  lcd.print("my project");
  Serial.print("welcome to my project");
  pinMode(relay1,OUTPUT);
  pinMode(relay2,OUTPUT);
  pinMode(relay3,OUTPUT);
  pinMode(relay4,OUTPUT);


}

void loop() 
{
  if(Serial.available()>0)
  {
    data = Serial.readString();
    data.trim();
    Serial.println(data);
    
    if(data == "relay1 on")
    {
      Serial.println("relay1 is on condition");
      digitalWrite(relay1,HIGH);

    }
    if(data == "relay1 off")
    {
      Serial.println("relay1 is off condition");
      digitalWrite(relay1,LOW);
    }
    if(data == "relay2 on")
    {
    Serial.println("relay2 is on condition");
      digitalWrite(relay2,HIGH);
  }
  if(data == "relay2 off")
  {
  Serial.println("relay2 is off condition");
      digitalWrite(relay2,LOW);
    
    }
     if(data == "relay3 on")
     {
    Serial.println("relay3 is on condition");
      digitalWrite(relay3,HIGH);
  }
  if(data == "relay3 off")
  {
  Serial.println("relay3 is off condition");
      digitalWrite(relay3,LOW);
      }
      if(data == "relay4 on")
     {
    Serial.println("relay4 is on condition");
      digitalWrite(relay4,HIGH);
  }
  if(data == "relay4 off")
  {
  Serial.println("relay4 is off condition");
      digitalWrite(relay4,LOW);
      }
    
    }
  }