# define PIN    5
# define ALARM  7

void setup() {

  TCCR1A = 0;
  TCCR1B = (1 << CS12) | (1 << CS11); // | (1 << CS10); 
  TCCR1C = 0;

  Serial.begin(115200);
  Serial.println(" Hello Counter One World!\n");

  pinMode(PIN, INPUT_PULLUP);
  pinMode(ALARM, OUTPUT);

  digitalWrite(ALARM, HIGH);
  delay(500);
  digitalWrite(ALARM, LOW);
}

unsigned int count;

void loop() {
  while (digitalRead(PIN));
  while (!digitalRead(PIN));

  count++;
  Serial.print(count);
  Serial.print("  ");

  int lo8 = TCNT1L; int hi8 = TCNT1H; 
  int theCount = (hi8 << 8 ) | lo8;
 
  Serial.print(theCount);
  Serial.println(" ");

  if (theCount - count != 0) {
    Serial.println("\nThat's All, Folks!\n");
    digitalWrite(ALARM, HIGH);
    for (; ; );
  }
}

// real output - timer/counter 1 counts glitches from the pushbutton
// an unbounced input just increments both once per

/*
  Hello Counter One World!

0  4 
1  6 
2  7 
3  10 
4  17 
5  21 
6  22 
7  26 
8  27 
9  29 
10  37 
11  41 
12  42 
*/