AutoLock

main.c

#include "Adafruit_TinyUSB.h"
#include "Arduino.h"
Adafruit_USBD_HID usb_hid;
const int buttonPin = 10;
bool activeState = false;
// taken from:
//  https://gist.github.com/todbot/13880b3ddfb4f1c857328f1974b12036
// Report IDs
enum
{
  RID_KEYBOARD = 1,
  RID_MOUSE,
  RID_CONSUMER_CONTROL, // Media, volume etc ..
};

// HID report descriptor using TinyUSB's template
uint8_t const desc_hid_report[] =
{
  TUD_HID_REPORT_DESC_KEYBOARD( HID_REPORT_ID(RID_KEYBOARD) )
};

static uint32_t timestamp = UINT32_MAX;
const uint8_t SENSOR_PIN = D7;

void sendLockSequence() {
  uint8_t keycode[6] = {HID_KEY_NONE, HID_KEY_Q};
  usb_hid.keyboardReport(RID_KEYBOARD, KEYBOARD_MODIFIER_LEFTCTRL | KEYBOARD_MODIFIER_LEFTGUI, keycode);
  delay(100);
  usb_hid.keyboardRelease(RID_KEYBOARD);
  timestamp = UINT32_MAX; // only lock once
}

void setup() {
  Serial.begin(9600);
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(D1, INPUT_PULLUP);
  pinMode(SENSOR_PIN, INPUT_PULLDOWN);
  usb_hid.setPollInterval(2);
  usb_hid.setReportDescriptor(desc_hid_report, sizeof(desc_hid_report));
  usb_hid.setStringDescriptor("Enzo HID Composite");

  usb_hid.begin();

    // wait until device mounted
  while ( !USBDevice.mounted() ) delay(1);
  Serial.println("Mounted");
}

void loop() {
  static uint8_t status = 1;

  digitalWrite(LED_BUILTIN, 1 - digitalRead(SENSOR_PIN));
  if (status != digitalRead(SENSOR_PIN)) {
    if (status) {
      status = 0;
      timestamp = millis()+1000;
    } else {
      status = 1;
      timestamp = UINT32_MAX;
    }
  } else {
    if (millis() > timestamp) sendLockSequence();
  }

  Serial.println(digitalRead(SENSOR_PIN));
  delay(1000);
}