I2C Request - Slave

#include <Wire.h>

int this_i2c_slaves_adress = 8;

void setup() {
  // put your setup code here, to run once:
  Wire.begin(this_i2c_slaves_adress);
  Wire.onRequest(request);
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(100);
}

void request () {
  Wire.write("Hey, I am an Arduino!");
}