#define BUTTONPIN 2
#define LEDPIN 4
const long interval = 30;
unsigned long prevMillis = 0;

void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(BUTTONPIN, INPUT_PULLUP);
pinMode(LEDPIN, OUTPUT);
}

void blinken() {
  
}
void loop() {
unsigned long currMillis = millis();

static unsigned long counter = 0;
static bool pressedFlag = false;

if (currMillis - prevMillis >= interval){
  prevMillis = currMillis;

  if (digitalRead(BUTTONPIN)== LOW){
  if(pressedFlag == false){
     counter++;
    Serial.println(counter);
    pressedFlag = true;
  }
  else
  pressedFlag = false;

}
}
}