#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);
  Serial.print("welcome :");
  lcd.begin(16,2);
  lcd.setCursor(0,0);
 pinMode(relay1,OUTPUT);
  pinMode(relay2,OUTPUT);
  pinMode(relay3,OUTPUT);
  pinMode(relay4,OUTPUT);

}
void loop()
{
  if(Serial.available()>0)
  {
    data =Serial.readString();
    Serial.println(data);
    data.trim();
    if(data=="relay1 on")
    {
      Serial .println("relay1 is on condition");
      lcd.setCursor(0,1);
      lcd .print(" relay1 on");
      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");
      lcd.setCursor(0,1);
      lcd .print(" relay2 on");
      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");
      lcd.setCursor(0,1);
      lcd .print(" relay3 on");
      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");
      lcd.setCursor(0,1);
      lcd .print(" relay4 on");
      digitalWrite(relay4 , HIGH);}
      if(data=="relay4 off")
      {
        Serial .println("relay4 is  off condition");
        digitalWrite(relay4,LOW);
      }
    }
  }