#include <Wire.h>

void setup()
{
  Wire.begin();   // Begin using Wire in master mode, it will initiate and control data transfers.

}
void loop ()
{
  Wire.beginTransmission(1);  //Start a new transmission to a device at "address number 1"
  Wire.write('s');              //send data: letter s
  Wire.endTransmission();     //ends the transmission and causes all buffered data to be sent.

  delay (500);

 Wire.beginTransmission(1);  //Start a new transmission to a device at "address number 1"
 Wire.write('x');            //send data: letter x
 Wire.endTransmission();     //ends the transmission and causes all buffered data to be sent.
 delay (500);
}