#include "Wire.h" // This is I2C library
#include "SoftwareSerial.h" // This is used for making rx tx pins using software
#define Rx 1
#define Tx 0
SoftwareSerial myserial(Rx, Tx); // declared Rx and Tx Pins

void setup() {
  Wire.begin(); // I2C communication Started
  myserial.begin(9600); // Serial communiation Started
  myserial.println("Communication Started");
}

void loop() {
  char d; // Character type declaration to store a character.
  if (myserial.available() > 0)
  {
    d = myserial.read(); // Read serial and store its value in variable d.
    if (d == '1') {   // Now transmit data over the I2C lines according to the cases.
      Wire.beginTransmission(1); // Communication started with first node\
       myserial.println("send ");
      Wire.write(1); // Value sent over the channel
      Wire.endTransmission(); // Communication Ended
      myserial.println("send :- ");
      myserial.print(d); // Print on Serial Monitor

    }
    if (d == '2') {             // Same of others.
      Wire.beginTransmission(1);
      Wire.write(2);
      Wire.endTransmission();
      myserial.println("send :- ");
      myserial.print(d);
    }

     if (d == '3') {             // Same of others.
      Wire.beginTransmission(2);
      Wire.write(3);
      Wire.endTransmission();
      myserial.println("send :- ");
      myserial.print(d);
    }


  }
  delay(10); // Delay to make sure whole CPU is not consumed.
}