Made directories for keyboard and converter projects.

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-Alternative Controller for HHKB pro
-===================================
-I want to add vi cursor and mouse keys to HHKB. Original HHKB controller is not programmable and
-firmware source code is not open. So, customizing HHKB needs to replace original controller with programmable one.
-I used Teensy++ as alternative controller. Though a Teensy has enough ports to drive HHKB,
-Teensy++ has clean pinout and it makes programing and wiring easier.
-
-This is just a proof of concept for replacing controller of HHKB, not a complete firmware.
-
-My prototype firmware source tree is here:
-    github(http://github.com/tmk/tmk_keyboard)
-This firmware is a port of my previous project:
-    HHKB style Mod(http://geekhack.org/showwiki.php?title=Island:11930)
-PJRC:
-    Teensy++/Teensy(http://www.pjrc.com/teensy/)
-
-
-Pros:
-    * without pattern cutting, case mod  and soldering
-    * can keep original controller intact
-    * can change HHKB behaviour as you like(by C programming)
-
-Cons:
-    * void your warranty
-    * unavailability of Teensy++/Teensy(because of PS3 cracking boom?)
-
-Features:
-    * customized keymap
-    * more keymap layers
-    * mouse keys for minimum mouse operation(never comfortable for normal use)
-    * and more...(in the future)
-
-Any suggestions or ideas are welcome.
-
-
-NOTE:
-    My HHKB is just "Professional". This means followings may not be applied to "Professional2".
-
-DISCLAIMER:
-    I'm not a professional for electronics and MCU programming. This may damage your HHKB.
-    And my English writing is poor, I'm not sure I can convey my notions accurately.
-
-
-Teensy++ installation
----------------------
-Angled USB mini B adapter is used to install Teensy++ laterally.
-(teensy_install.jpg)
-
-Bread baord wires are used to connect Teensy++.
-(teensy_wiring.jpg)
-(connector_contact.jpg)
-
-
-HHKB internal
--------------
-HHKB pro has some chips on separate two PCBs.
-
-Controller PCB:
-    M38K07M4    Renesas MCU with USB function
-                http://documentation.renesas.com/eng/products/mpumcu/rej03b0192_38k0ds.pdf
-
-    (HHKB_controller.jpg)
-
-Keyswitch PCB:
-    HC4051      Analog Multiplexer: select a row line.
-                http://www.alldatasheet.com/datasheet-pdf/pdf/203989/KODENSHI/KK74HC4051A.html
-    LS145       BCD Decoder: select a column line.
-                http://www.alldatasheet.com/datasheet-pdf/pdf/27373/TI/SN74LS145D.html
-    BU9831      Non-volatile electronic potentiometer: for calibration?
-                http://www.alldatasheet.com/datasheet-pdf/pdf/36387/ROHM/BU9831.html
-    TP1683/4    Capacitive Sensing controller: no datasheet available.
-
-    (HHKB_keyswitch.jpg)
-
-    Topre original chip?
-    (HHKB_TP1684.jpg)
-
-
-Two PCBs are connected by 15 lines. Vcc and GND use 3 lines each, other 9 lines are for keyboard signaling.
-
-    Keyswitch PCB connector                                 Teensy++ pins
-    -------------------------------------------------------------------------------
-     1  Vcc(5V)                                             5V
-     2  Vcc(5V)
-     3  Vcc(5V)
-     4  TP1684    KEY: Low(0) when key pressed              PE6 input(with pullup)
-     5  TP1684    KEY_PREV: assert previous key state???    PE7 output
-     6  HC4051    A(bit0) select 8 rows(0 to 7)             PB0 output
-     7  HC4051    B(bit1)                                   PB1 output
-     8  HC4051    C(bit2)                                   PB2 output
-     9  LS145     A(bit0) select 8 columns(0 to 7)          PB3 output
-    10  LS145     B(bit1)                                   PB4 output
-    11  LS145     C(bit2)                                   PB5 output
-    12  LS145     D(enable) Low(0) enable selected column   PB6 output
-    13  GND
-    14  GND
-    15  GND                                                 GND
-
-    (HHKB_connector.jpg)
-
-
-Keyswitch matrix
-----------------
-60 keyswitches in 8*8 matrix. It is ghost-free and bounce-free.
-
-  COL 0     1       2       3       4       5       6       7
-ROW ---------------------------------------------------------------
-  0|  2     q       w       s       a       z       x       c
-  1|  3     4       r       e       d       f       v       b
-  2|  5     6       y       t       g       h       n       _NONE_
-  3|  1     Esc     Tab     Control LShift  LAlt    LMeta   Space
-  4|  7     8       u       i       k       j       m       _NONE_
-  5|  \     `       Delete  Return  Fn      RShift  RAlt    RMeta
-  6|  9     0       o       p       ;       l       ,       _NONE_
-  7|  -     +       ]       [       '       /       .       _NONE_
-
-
-Matrix diagram:
-             +-------------------------+-+-+-+-+-+-+-+     Vcc
-             |bias control?            - - - - - - - -     ---
-             |                  3.9K*8 R R R R R R R R      |
-    +--------^+      +--------+        - - - - - - - -      |  
-    |        2|      | HC4051 <0-------|-|-|-|-|-|-|-|--|R|-+
-    |         |capa. |        <1-------|-|-|-|-|-|-|-|--|R|-+
-    | TP1684  |sense |        <2-------|-|-|-|-|-|-|-|--|R|-+
-    |       11<------|        <3-------|-|-|-|-|-|-|-|--|R|-+
-    |         |      |        <4-------|-|-|-|-|-|-|-|--|R|-+
-    |         |      |        <5-------|-|-|-|-|-|-|-|--|R|-+
-    |         <-+    |        <6-------|-|-|-|-|-|-|-|--|R|-+
-    |   1   4 | |    |        <7-------|-|-|-|-|-|-|-|--|R|-+
-    +---V---^-+ |    +-^-^-^--+        0 1 2 3 4 5 6 7  33K*8
-       KEY PREV |      A B C         +-----------------+
-        |   | +-^----+ | | |         |      LS145      |
-    Vcc |   | |BU9831| | | |         +-^--^--^--^------+
-    --- |   | +------+ | | |           A  B  C  D   +------+
-     |  |   |          | | |           |  |  |  |   |      |
-    1-3 4   5          6 7 8           9 10 11 12 13-15    |
-    +--------------------------------------------------+   |
-    |                connector                         |  ---
-    +--------------------------------------------------+  GND
-                    to controller
-                                    
-
-Signals charts:
-    While pressing space bar, watched HHKB original controller signals by logic analyzer.
-    Row and column is looping between 0-7 each for selecting a key.
-    A key is scaned every about 15ms, so scan rate is 66Hz.
-
-    (HHKB_chart1.jpg)
-
-    Space bar locate at ROW:3 COL:7. A key is selected by HC4051(C,B,A) and LS145(C,B,A).
-    Key state can be read on TP1684(4/KEY) while asserting low on LS145(D). 
-
-    Usage of TP1684(5) is not clear. Controller seemed to output previous key state on this line.
-    However key state can be read without using this signal.
-
-    (HHKB_chart2.jpg)
-
-
-Matrix scan pseudo code:
-    for (row: 0-7) {
-        SELECT_ROW(row);        // set HC4051(A,B,C)
-
-        for (col: 0-7) {
-            SELECT_COL(col);    // set LS145(A,B,C)
-
-            _delay_us(40);
-
-            if (prev_key_state(row, col)) {
-                KEY_PREV_ON;
-            }
-
-            _delay_us(7);
-
-            ENALBLE_COL();      // set LS145(D) to low
-
-            _delay_us(10);
-
-            if (KEY == 0) {     // read TP1684(KEY)
-                // key pressed
-            } else {
-                // not pressed
-            }
-
-            KEY_PREV_OFF;
-            UNALBLE_COL();      // set LS145(D) to high
-
-            _delay_us(150);
-        }
-    }
-
-
-Keymap layers
--------------
-Followings are added layers with additional Fn keys.
-
-see keymap.c
-
-EOF