#define BUTTON_PIN 4

/**
 * Initialize a new OneButton instance for a button
 * connected to digital pin 4, which is active high.
 * As this does not use any internal resistor
 * an external resistor (4.7k) may be required to create a LOW signal when the button is not pressed.
 */

OneButton btn = OneButton(
  BUTTON_PIN,  // Input pin for the button
  false,       // Button is active high
  false        // Disable internal pull-up resistor
);