#include <Bounce2.h>

unsigned long lastSec = 0;

Bounce bounce1 = Bounce();
Bounce bounce2 = Bounce();
Bounce bounce3 = Bounce();

int hr = 0;
int mn = 0;
int sec = 0;

void setup() {

  pinMode(7, OUTPUT);

  bounce1.attach(4, INPUT_PULLUP);
  bounce1.interval(25);
  bounce2.attach(5, INPUT_PULLUP);
  bounce2.interval(25);
  bounce3.attach(6, INPUT_PULLUP);
  bounce3.interval(25);

  Serial.begin(115200);

}

void loop() {

  if(millis() - lastSec >= 1000){
    getTime();
    lastSec = millis();
    showTime();

    if(hr == 0 && mn == 1 && sec == 0){
      digitalWrite(7, HIGH);
    }
    if(hr == 0 && mn == 3 && sec ==0){
      digitalWrite(7, LOW);
    }
  }

  bounce1.update();
  bounce2.update();
  bounce3.update();

  if (bounce1.rose()) {
    hr += 1;
    if(hr >= 24){
      hr = 0;
    }
  }

  if (bounce2.rose()) {
    mn += 1;
    if(mn >= 60){
      mn = 0;
    }
  }

  if (bounce3.rose()) {
    sec += 1;
    if(sec >= 60){
      sec += 0;
    }
  }

}

void getTime(){
  sec++;
  if(sec >= 60){
    sec = 0;
    mn += 1;
  }
  if(mn >= 60){
    mn = 0;
    hr += 1;
  }
  if(hr >= 24){
    hr = 0;
  }
}

String uniformize(int val){
  String outputVal = "";
  if(val < 10){
    outputVal = "0" + String(val);
  }else{
    outputVal = String(val);
  }
  return outputVal;
}

void showTime(){
  Serial.println(uniformize(hr) + ":" + uniformize(mn) + ":" + uniformize(sec));
}