// C++ code
//
unsigned long time_arr[256];
unsigned int arr_counter = 0;
unsigned long first_read_time;
unsigned long last_read_time;
unsigned int sensor_counter;
unsigned long millis_now;
void setup()
{
  pinMode(13, OUTPUT);
  pinMode(2, INPUT);
  sensor_counter = 0;
  last_read_time = 0;
  Serial.begin(9600);
}

void writeString(String stringData) {

  for (int i = 0; i < stringData.length(); i++)
  {
    Serial.write(stringData[i]);
  }

}

void loop()
{
  millis_now = millis();
  if((millis_now - last_read_time) > 100){
    if (digitalRead(2)){
      if (sensor_counter == 0){
      	first_read_time = millis_now;
      }
      sensor_counter += 1;
      last_read_time = millis();
    }
  }
  if (sensor_counter > 2){
	sensor_counter = 0;
    time_arr[arr_counter] = millis_now - first_read_time;

    arr_counter += 1;
    for (int k = 0; k < arr_counter; k++){
      	String time_to_press = String(k + 1, DEC) + ". time(ms): ";
      	time_to_press += String(time_arr[k], DEC);
      	Serial.println(time_to_press);
    }
  }
}