#include "wire.h"

const int SLAVE_ADDRESS = 0x3F;  //This address is unique for this device
int data[4] = {1, 2, 3, 4};      //This line indicates the data packages that will be sent
								 //to the other device.
void setup() {
 Wire.begin(SLAVE_ADDRESS);     //This line starts the wire process.
 Wire.onRequest(requestEvent);
 Serial.begin(9600);
 delay(1000);
  Serial.println("I2C Esclavo listo"); //This part shows the message
}                                      //in the serial monitor.
								
void loop() {
  data[0]++; //This part of the code writes consecutive numbers and sends them
  data[1]++; //until you stop it.
  data[2]++;
  data[3]++;
  delay(1000);
}
								
void requestEvent() {
 // This sends data over to the "master"
  uint8_t byteData[4];
  for (int i = 0; i < 4; i++) {
	byteData[i] = (uint8_t)data[i];
  }
  Wire.write(byteData, 4);
}