#include <Wire.h>

// Include the required Wire library for I2C<br>

int x = 0;
void setup() {
  // Start the I2C Bus as Master
//  Wire.setSDA(D4);
//  Wire.setSCL(D5);
  Wire.begin();
}
void loop() {
  Wire.beginTransmission(9); // transmit to device #9
  Wire.write(x);              // sends x
  Wire.endTransmission();    // stop transmitting
  x++; // Increment x
  if (x > 5) x = 0; // `reset x once it gets 6
  delay(500);
}