// Presses a key every once in a while on Arduino Leonardo / Pro Micro (ATMega32U4)

#include "Keyboard.h"

const unsigned long waitTime = 300000; // 5 minutes
const int buttonPin = 2;

void setup() {
  Serial.begin(9600);
  Serial.println("Starting HID");
  pinMode(buttonPin, INPUT_PULLUP);
  Keyboard.begin();
}

void loop() {
  int buttonState = digitalRead(buttonPin);
  
  if (buttonState == HIGH) {
    Serial.println("click");
    
    // press key
    Keyboard.press(129);  // https://www.arduino.cc/reference/en/language/functions/usb/keyboard/keyboardmodifiers/
    delay(2);
    Keyboard.release(129);
  }
  else {
    Serial.println("LOW");
  }
  
  // wait
  delay(waitTime);
}