/*
  Simple "state change detection" button
*/

const int BTN_PIN = 2;

int oldBtnState = 1;  // pin idles HIGH with pullup

void checkButton()  {
  int btnState = digitalRead(BTN_PIN);  // read the pin
  if (btnState != oldBtnState)  {       // if it changed
    oldBtnState = btnState;             // remember the state
    if (btnState == LOW)  {             // was just pressed
      Serial.println("Button Pressed");
    } else  {                           // was just released
      Serial.println("Button Released");
    }
    delay(20);  // short delay to debounce button
  }
}

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

void loop() {
  checkButton();
}