#include <Wire.h>
//Fab Academy 2018
//Networking and communications
// I2C, Master and 4 slaves
//Gerardo.Saz

//  ---- MASTER ----
void setup() {
  Wire.begin();        // join i2c bus (address optional for master)
  Serial.begin(115200);  // start serial for output
  pinMode(LED_BUILTIN, OUTPUT);
  Serial.println("Fab Academy 2018");
}

void loop() {
  int num = random(1,4);
  Wire.beginTransmission(num);
  Wire.write(1);
  Wire.endTransmission();
  Serial.println("Execute something slave #"  String (num));
  
  digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(600);                       // wait for a second
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(500);   
  digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(600);                       // wait for a second
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(500);                       // wait for a second
}