Hello.i have connected 2 arduino mega with i2c. İ send 1 byte to second arduino.its work perfect.how can i understand second arduino connect.second arduino always receive byte.i dont want to send data to first arduino.because i dont want traffic in my i2c line.how can i dedect second arduino.pls write me simple code.example. When connect 2 arduino then work a led light.first arduino address 5 second is 7.thanks