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diff --git a/arduino/libraries/Bluefruit52Lib/examples/Peripheral/hid_keyscan/hid_keyscan.ino b/arduino/libraries/Bluefruit52Lib/examples/Peripheral/hid_keyscan/hid_keyscan.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
+*********************************************************************/
+
+/* This sketch demonstate how to use BLE HID to scan an array of pin
+ * and send its keycode. It is essentially an implementation of hid keyboard,
+ * useful reference if you want to make an BLE keyboard.
+ */
+
+#include <bluefruit.h>
+
+BLEHidAdafruit blehid;
+
+// Array of pins and its keycode
+// For keycode definition see BLEHidGeneric.h
+uint8_t pins[]    = { A0, A1, A2, A3, A4, A5 };
+uint8_t hidcode[] = { HID_KEY_A, HID_KEY_B, HID_KEY_C ,HID_KEY_D, HID_KEY_E, HID_KEY_F };
+
+uint8_t pincount = sizeof(pins)/sizeof(pins[0]);
+
+// Modifier keys, only take cares of Shift
+// ATL, CTRL, CMD keys are left for user excersie.
+uint8_t shiftPin = 11;
+
+bool keyPressedPreviously = false;
+
+void setup() 
+{
+  Serial.begin(115200);
+  while ( !Serial ) delay(10);   // for nrf52840 with native usb
+
+  Serial.println("Bluefruit52 HID Keyscan 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("Wire configured Pin to GND to send key");
+  Serial.println("Wire Shift Keky to GND if you want to send it in upper case");
+  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");
+
+  // set up pin as input
+  for (uint8_t i=0; i<pincount; i++)
+  {
+    pinMode(pins[i], INPUT_PULLUP);
+  }
+
+  // set up modifier key
+  pinMode(shiftPin, INPUT_PULLUP);
+
+  /* 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()
+{
+  /*-------------- Scan Pin Array and send report ---------------------*/
+  bool anyKeyPressed = false;
+
+  uint8_t modifier = 0;
+  uint8_t count=0;
+  uint8_t keycode[6] = { 0 };
+
+  // scan modifier key (only SHIFT), user implement ATL, CTRL, CMD if needed
+  if ( 0 == digitalRead(shiftPin) )
+  {
+    modifier |= KEYBOARD_MODIFIER_LEFTSHIFT;
+  }
+
+  // scan normal key and send report
+  for(uint8_t i=0; i < pincount; i++)
+  {
+    if ( 0 == digitalRead(pins[i]) )
+    {
+      // if pin is active (low), add its hid code to key report
+      keycode[count++] = hidcode[i];
+
+      // 6 is max keycode per report
+      if ( count == 6)
+      {
+        blehid.keyboardReport(modifier, keycode);
+
+        // reset report
+        count = 0;
+        memset(keycode, 0, 6);
+      }
+
+      // used later
+      anyKeyPressed = true;
+      keyPressedPreviously = true;
+    }    
+  }
+
+  // Send any remaining keys (not accumulated up to 6)
+  if ( count )
+  {
+    blehid.keyboardReport(modifier, keycode);
+  }
+
+  // Send All-zero report to indicate there is no keys pressed
+  // Most of the time, it is, though we don't need to send zero report
+  // every loop(), only a key is pressed in previous loop() 
+  if ( !anyKeyPressed && keyPressedPreviously )
+  {
+    keyPressedPreviously = false;
+    blehid.keyRelease();
+  }  
+  
+  // Poll interval
+  delay(10);
+}
+
+/**
+ * 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 );
+  }
+}