boxing_timer.ino

// Simple boxing timer

// turn on debug strings
#define DEBUG true

// leds
int pingreen = 13;
int pinred = 11;
// buzzer
int pinbuzz = 12;

int rounds = 3;
int rests = 0;
int round_t = 1; //minutes
int rest_t = 1; //minutes

enum {
  IN_ROUND = 0,
  START_ROUND,
  OFF
};
int timer_status = OFF;

void setup(){
  Serial.begin(9600);
#ifdef DEBUG
    Serial.println("Timer starts.");
#endif
  pinMode(pingreen, OUTPUT);
  pinMode(pinred, OUTPUT);
  timer_status = START_ROUND;
}

void loop(){
  unsigned long int time_total_min = round( (millis()/1000)/60 );
  
  if(rests > 0) time_total_min += rest_t * rests;
  
  // turn off the timer
  if(rounds == 0 && timer_status < OFF){
    off();
  }else if(rounds > 0){
    // timer is ON!
    // if we still have more rounds then start another one
    if(rounds > 0 && timer_status == START_ROUND ){
      start_round(rounds);
    }
    // stop the round and rest
    if( timer_status == IN_ROUND && time_total_min == round_t
        || time_total_min >= ( (round_t + rest_t) * (rests+1) ) ){
      stop_round(rounds);
    }
  }
}

void start_round(int r){
  int beep_times = 2;
 
#ifdef DEBUG
  Serial.print("Starts round: ");
  Serial.println(r);
#endif

  digitalWrite(pingreen, HIGH);
  digitalWrite(pinred, LOW);
  for(;beep_times > 0;beep_times--){
    tone(pinbuzz, 33, (1000/8));
    delay(250);
  }
  timer_status = IN_ROUND;
}

void stop_round(int r){
  Serial.print("Stops round: ");
  Serial.println(r);
  digitalWrite(pingreen, LOW);
  digitalWrite(pinred, HIGH);
  tone(pinbuzz, 33, (1000/2));
  delay( min2mil(rest_t) );
  timer_status = START_ROUND;
  rounds--;
  rests++;
}

void off(){
  int beep_times = 3;
  
  for(;beep_times > 0;beep_times--){
    digitalWrite(pingreen, HIGH);
    digitalWrite(pinred, HIGH);
    tone(pinbuzz, 33);
    delay(250);
    noTone(pinbuzz);
    digitalWrite(pingreen, LOW);
    digitalWrite(pinred, LOW);
  }
  
  timer_status = OFF;
#ifdef DEBUG
  Serial.println("Timer end.");
#endif
}

/*
 * from minutes (int) to milliseconds (unsigned int)
 */
unsigned min2mil(int t){
  return ((t*60)*1000);
}