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diff --git a/arduino/libraries/Bluefruit52Lib/examples/Peripheral/hid_keyboard/hid_keyboard.ino b/arduino/libraries/Bluefruit52Lib/examples/Peripheral/hid_keyboard/hid_keyboard.ino
new file mode 100755
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+++ b/arduino/libraries/Bluefruit52Lib/examples/Peripheral/hid_keyboard/hid_keyboard.ino
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+/*********************************************************************
+ This is an example for our nRF52 based Bluefruit LE modules
+
+ Pick one up today in the adafruit shop!
+
+ Adafruit invests time and resources providing this open source code,
+ please support Adafruit and open-source hardware by purchasing
+ products from Adafruit!
+
+ MIT license, check LICENSE for more information
+ All text above, and the splash screen below must be included in
+ any redistribution
+*********************************************************************/
+#include <bluefruit.h>
+
+BLEDis bledis;
+BLEHidAdafruit blehid;
+
+bool hasKeyPressed = false;
+
+void setup() 
+{
+  Serial.begin(115200);
+  while ( !Serial ) delay(10);   // for nrf52840 with native usb
+
+  Serial.println("Bluefruit52 HID Keyboard Example");
+  Serial.println("--------------------------------\n");
+
+  Serial.println();
+  Serial.println("Go to your phone's Bluetooth settings to pair your device");
+  Serial.println("then open an application that accepts keyboard input");
+
+  Serial.println();
+  Serial.println("Enter the character(s) to send:");
+  Serial.println();  
+
+  Bluefruit.begin();
+  // Set max power. Accepted values are: -40, -30, -20, -16, -12, -8, -4, 0, 4
+  Bluefruit.setTxPower(4);
+  Bluefruit.setName("Bluefruit52");
+
+  // Configure and Start Device Information Service
+  bledis.setManufacturer("Adafruit Industries");
+  bledis.setModel("Bluefruit Feather 52");
+  bledis.begin();
+
+  /* Start BLE HID
+   * Note: Apple requires BLE device must have min connection interval >= 20m
+   * ( The smaller the connection interval the faster we could send data).
+   * However for HID and MIDI device, Apple could accept min connection interval 
+   * up to 11.25 ms. Therefore BLEHidAdafruit::begin() will try to set the min and max
+   * connection interval to 11.25  ms and 15 ms respectively for best performance.
+   */
+  blehid.begin();
+
+  // Set callback for set LED from central
+  blehid.setKeyboardLedCallback(set_keyboard_led);
+
+  /* Set connection interval (min, max) to your perferred value.
+   * Note: It is already set by BLEHidAdafruit::begin() to 11.25ms - 15ms
+   * min = 9*1.25=11.25 ms, max = 12*1.25= 15 ms 
+   */
+  /* Bluefruit.setConnInterval(9, 12); */
+
+  // Set up and start advertising
+  startAdv();
+}
+
+void startAdv(void)
+{  
+  // Advertising packet
+  Bluefruit.Advertising.addFlags(BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE);
+  Bluefruit.Advertising.addTxPower();
+  Bluefruit.Advertising.addAppearance(BLE_APPEARANCE_HID_KEYBOARD);
+  
+  // Include BLE HID service
+  Bluefruit.Advertising.addService(blehid);
+
+  // There is enough room for the dev name in the advertising packet
+  Bluefruit.Advertising.addName();
+  
+  /* Start Advertising
+   * - Enable auto advertising if disconnected
+   * - Interval:  fast mode = 20 ms, slow mode = 152.5 ms
+   * - Timeout for fast mode is 30 seconds
+   * - Start(timeout) with timeout = 0 will advertise forever (until connected)
+   * 
+   * For recommended advertising interval
+   * https://developer.apple.com/library/content/qa/qa1931/_index.html   
+   */
+  Bluefruit.Advertising.restartOnDisconnect(true);
+  Bluefruit.Advertising.setInterval(32, 244);    // in unit of 0.625 ms
+  Bluefruit.Advertising.setFastTimeout(30);      // number of seconds in fast mode
+  Bluefruit.Advertising.start(0);                // 0 = Don't stop advertising after n seconds
+}
+
+void loop() 
+{
+  // Only send KeyRelease if previously pressed to avoid sending
+  // multiple keyRelease reports (that consume memory and bandwidth)
+  if ( hasKeyPressed )
+  {
+    hasKeyPressed = false;
+    blehid.keyRelease();
+    
+    // Delay a bit after a report
+    delay(5);
+  }
+    
+  if (Serial.available())
+  {
+    char ch = (char) Serial.read();
+
+    // echo
+    Serial.write(ch); 
+
+    blehid.keyPress(ch);
+    hasKeyPressed = true;
+    
+    // Delay a bit after a report
+    delay(5);
+  }
+
+  // Request CPU to enter low-power mode until an event/interrupt occurs
+  waitForEvent();  
+}
+
+/**
+ * Callback invoked when received Set LED from central.
+ * Must be set previously with setKeyboardLedCallback()
+ *
+ * The LED bit map is as follows: (also defined by KEYBOARD_LED_* )
+ *    Kana (4) | Compose (3) | ScrollLock (2) | CapsLock (1) | Numlock (0)
+ */
+void set_keyboard_led(uint8_t led_bitmap)
+{
+  // light up Red Led if any bits is set
+  if ( led_bitmap )
+  {
+    ledOn( LED_RED );
+  }
+  else
+  {
+    ledOff( LED_RED );
+  }
+}