Alarm clock for Arduino

Sketch.java

// Now time 
#define START_HOUR 1
#define START_MINUTES 21

// Alarm
#define ALARM_HOUR 1
#define ALARM_MINUTES 22

bool isRing = false;
int nowHour = START_HOUR;
int nowMinutes = START_MINUTES;
int nowSecond = 50;

void setup() {
  Serial.begin(9600);
  
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(12, OUTPUT);
  
  // Switch
  digitalWrite(12, HIGH);
}

void loop() {
  // put your main code here, to run repeatedly:
  showTime();
  if (isSwitchON()) {
      checkRing();
      if (isRing) {
        startRing();
        
        checkStopRing();
        if (isRing == false) {
          stopRing();
        }
      }
  }
  nextTime();  
}

bool isSwitchON() {
  if (digitalRead(13) == HIGH) {
    return true;
  }
  return false;
}

void checkRing() {
  if (nowHour    == ALARM_HOUR &&
      nowMinutes == ALARM_MINUTES  &&
      nowSecond == 0) {
    isRing = true;
  }
}

void checkStopRing() {
  if (0 > getDistance()) {
    isRing = false;
  }
}

void startRing() {
  digitalWrite(10, HIGH);
  tone(10, 262);
}

void stopRing() {
  noTone(10);
}

int getDistance() {
  digitalWrite(11, HIGH);
  int sum = 0;
  for (int i = 0; i < 100; i++) {
    sum += analogRead(0);
  }
  int distance = sum / 100;
  return distance;
}

void nextTime() {
   delay(1000);
   
   nowSecond += 1;
   
   if (60 <= nowSecond) {
       nowSecond = 0;
       nowMinutes += 1;
   }
   
   if (60 <= nowMinutes) {
     nowMinutes = 0;
     nowHour += 1;
   }
   
   if (24 <= nowHour) {
     nowHour = 0;
   } 
}

void showTime() {
   Serial.print(nowHour);
   Serial.print(":");
   Serial.print(nowMinutes);
   Serial.print(":");
   Serial.println(nowSecond); 
}