// const int dataPin = PB0;   /* DS */
// const int clockPin = PB1;  /* SHCP */
// const int latchPin = PB2;  /* STCP */
// const int button = PB3;
// int lastButtonState = 1;
// void setup() {
//   pinMode(dataPin, OUTPUT);
//   pinMode(clockPin, OUTPUT);
//   pinMode(latchPin, OUTPUT);
//   pinMode(button, INPUT_PULLUP);
// }


// byte push = 0b00000001;
// void loop() {
//   int value = digitalRead(button);
//   if (value != lastButtonState) {
//     if (value == LOW)
//     {
//       digitalWrite(latchPin, LOW);
//       shiftOut(dataPin, clockPin, MSBFIRST, push);
//       digitalWrite(latchPin, HIGH);
//       push++;
//     }
//     delay(50);
//     lastButtonState = value;
//   }
// }

const int dataPin = PB0;   /* DS */
const int clockPin = PB1;  /* SHCP */
const int latchPin = PB2;  /* STCP */
const int button = PB3;

int buttonState;
int lastButtonState = HIGH;
unsigned long lastDebounceTime = 0;
unsigned long debounceDelay = 50;
byte push = 0b00000001;

void setup() {

  pinMode(dataPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(latchPin, OUTPUT);
  pinMode(button, INPUT_PULLUP);

}

void loop(){

  int reading = digitalRead(button);
  if (reading != lastButtonState){
    lastDebounceTime = millis();
  }

  if ((millis() - lastDebounceTime) > debounceDelay) {
    if (reading != buttonState) {
      buttonState = reading;

      if (buttonState == LOW) {
        digitalWrite(latchPin, LOW);
        shiftOut(dataPin, clockPin, MSBFIRST, push);
        digitalWrite(latchPin, HIGH);
        push++;
      }
    }
  }
  lastButtonState = reading;
}