//juan david ramirez rodriguez
//imon salgado lara

int ss = 0;
int mm = 0;
int hh = 0;

void setup() {

  Serial.begin(9600);
}

void loop() {
  ss= (ss + 1) % 60;

  mm = (mm+ (ss == 0)) % 60;

  hh= (hh + (mm == 0 && ss == 0)) % 24;

  
  Serial.print(hh);
  Serial.print(":");
  Serial.print(mm);
  Serial.print(":");
  Serial.println(ss);
  
  delay(900); // incrementa cada segundo
}