const int BTN_PIN = 14;
const int LED_PIN = 32;

bool ledState = false;
int lastBtnState = HIGH;

void checkButton()  {
  int btnState = digitalRead(BTN_PIN);  // read the button
  if (lastBtnState != btnState) {       // if it changed
    lastBtnState    = btnState;         // save the state
    if (btnState == LOW)  {             // if LOW was just pressed
      Serial.println("The button was just pressed");
      ledState = !ledState;             // toggle LED state
      digitalWrite(LED_PIN, ledState);  // write LED state
    } else  {                           // if HIGH was just released
      Serial.println("The button was just released");
    }
    delay(20);                          // debounce the button
  }
}

void setup() {
  Serial.begin(115200);
  pinMode(BTN_PIN, INPUT_PULLUP);
  pinMode(LED_PIN, OUTPUT);
  Serial.println("\nReady!\n");
}

void loop() {
  checkButton();
}