~~REVEAL~~
======Bluetooth HID Keyboard======

==== Summary ====

This prototype was request by Daniel Flood to explore the possibility of make a low cost skooge-like Human Interface Device (HID).  Brendan Halliday completed the prototype.
The BlueDuino Rev2 is an Arduino compatible microcontroller development board based on the ATmega32U4 IC with Bluetooth 4.0 [[http://wiki.aprbrother.com/wiki/BlueDuino_rev2|Blueduino Documentation from Supplier]]

==== Required Files: ====

  * [[http://freeware.the-meiers.org/CoolTermWin.zip|Coolterm Serial Console]]
  * [[http://processors.wiki.ti.com/images/6/64/SerialBootTool_1_3_2.zip|SerialBootTool from TI]]
  * [[https://dn-abcdn1.qbox.me/keyboard-1.0.bin|ZeroKeyboard Firmware]]
  * [[https://codeload.github.com/AprilBrother/BlueDuino-Library/zip/master| Blueduino Library]]


==== Required Hardware: ====

  * Blueduino Board
  * FTDI or CP2102 USB-Serial converter.
  * Breadboard
  * Buttons
  * Hookup wires (Male-Male, Male-Female, Female-Female)
  * MicroUSB cable.


==== Tools ====

Soldering Iron

==== Preparation ====

**NOTE:** You must upload new firmware to the module if you command it into upgrade mode. Otherwise the module will stay in upgrade mode and seem bricked.

  * Wire the USB to UART converter and BlueDuino like so

|USB to UART converter|BlueDuino Rev2|
|RX                   |RXI (Serial1) |
|TX                   |TXO (Serial1) |
|GND                  |GND           |
||

==== Activity Summary ====

  * Plug in the BlueDuino to a PC. Take note of which COM port it shows up as in Device Manager.
  * Plug in the USB to UART converter to the same PC. Take note of which COM port it shows up as in Device Manager.
  * Open Coolterm, click on **Options**, then set Port to the COM port for the USB to UART converter.
  * Set Baudrate to 9600.
  * You will get “OK” when you type “AT” and pressing **ENTER**.
  * So type “AT+SBLUP”, you will get “OK+SBLUP”. This means the cc254x module is ready for upgrade. It won't accept any other AT command now.
  * Disconnect in Coolterm and then close it.
  * Open Arduino and upload an empty sketch to the BlueDuino. An empty sketch will practically be ''%%void setup(){} void loop() {}%%''
  * Open SerialBootTool, it will ask you what device family to use, select BLE.
  * Click on **Select File** and select the keyboard-1.0.bin file. Click **Open.**
  * Click on **Port Settings** and select the USB to UART serial port and baud rate 115200.
  * Click **OK**
  * Click **Load Image**
  * Wait a while. You will see the words “Download completed successfully”
  * You're done!

==== Arduino Sample Code ====
<code>#include "AB_BLE.h"

#define BAUD_RATE 57600

AB_BLE ble(&Serial1);

const int buttonPin = 8;     // the number of the pushbutton pin

// variables will change:
int buttonState1 = 0;         // variable for reading the pushbutton status

void setup() {
  Serial1.begin(BAUD_RATE);
  pinMode(buttonPin, INPUT_PULLUP);
}

void loop() {
 // read the state of the pushbutton value:
 buttonState1 = digitalRead(buttonPin);
 // check whether a  pushbutton is pressed.
 // if it is, the buttonState is HIGH:
 
 if (buttonState1 == LOW) {    
  ble.print("AT+KEY=");
  ble.println("Hello world");
 }
 delay(500);
}
</code>


==== Notes and additions ====

  * This kind of bluetooth keyboard has an inherent delay of approximately 100 milliseconds which m,eans it may not be directly usable for bluetooth gamepads but great for simple interactivity.
  * The example I've provided above is not properly debounced, which means that it can trigger the keys being sent a few times before you let go. This is why there is a delay(500); as a workaround.
  * The key presses are sent by the ble.print("AT+KEY="); and ble.println("Hello world"); lines, change "Hello world" for any phrase or keyboard key you want to be pressed.
  * This firmware does not seem to support anything other than the alphanumeric keys.






 
=====Production notes=====

 ===== Feedback =====

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 ===== References =====


[[http://www.instructables.com/id/Electric-Generator-Powering-LEDs/|LED generator]]


 ==== Files ====