bool buttonstate=0;
bool buttonpressed=0;
unsigned long pressdoration=0;
 unsigned long pressstart;
int buttonpin=7;
int led=9;

void setup() {
  Serial.begin(115200);
  pinMode(7, INPUT_PULLUP);
  pinMode(9, OUTPUT);


 
}

void loop() {

  bool buttonstate=digitalRead(buttonpin);
  if(buttonstate==LOW){
    if(!buttonpressed){
      buttonpressed=true;
      pressstart=millis();
    }
  }
    else if(buttonpressed){
      pressdoration=millis()-pressstart;
      if(pressdoration<500){
        Serial.println("aaaaa");
        digitalWrite(led, HIGH);
        delay(500);
      }
      else{
        Serial.print("long");
        digitalWrite(led, LOW);
        delay(500);
      }
      buttonpressed=false;
    }
  }//