#define BUTTON_PIN 4

void setup() {
  Serial.begin(115200);
  pinMode(BUTTON_PIN, INPUT_PULLUP);
}

int lastState = HIGH;
void loop() {
  int value=digitalRead((BUTTON_PIN));

  if(value==HIGH) {
    Serial.println("button released");
    delay(200);
  }
  if(value==LOW) {
    Serial.println("button pressed");
    delay(200);
  }
}