#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");
    }
    if (value == LOW) {
      Serial.println(" button pressed");
  }

}