/*
  BigBlue, Mark Wilson 2012
                                 +-----------------------------------+
                                 |            ARDUINO                |
                                 |                            [AREF] |     +---[10kR]---[GND]
                                 |                             [GND] |     |     
                                 |                          LED [13] |     |      _ switch N/O
                                 | [RST]                        [12] +-----+-----+ +---[+5V]
                                 | [3V3]                    PWM [11] |        
                                 | [5V0]                    PWM [10] |              +-----------------+
  [GND]--[10kR]--+               | [GND]                    PWM [ 9] |              |       LCD       |
                 |               | [GND]                        [ 8] +--------------+ [ 4:RS]         |
  [+5V]---[LDR]--+---------+     | [Vin]                        [ 7] +--------------+ [ 6:ENABLE]     |
                           |     |                          PWM [ 6] +--------------+ [11:DB4]        |
        +------------+     +-----+ [A0]                     PWM [ 5] +--------------+ [12:DB5]        |
        |  DS1307    |           | [A1]                         [ 4] +--------------+ [13:DB6]        |
        |      [VCC] +--[+5V]    | [A2]                     PWM [ 3] +--------------+ [15:B/L]        |
        |      [GND] +--[GND]    | [A3]                         [ 2] +--------------+ [14:DB7]        |
        |      [SDA] +-----------+ [A4] SDA                  TX [ 1] |       [+5V]--+ [ 2:Vdd]        |
        |      [SCL] +-----------+ [A5] SCL                  RX [ 0] |       [GND]--+ [ 1:GND]        |
        +------------+           |                                   |       <Pot>--+ [15:LEDA]       |
                                 +-----------------------------------+       [GND]--+ [16:LEDK]       |
                                                                                    +-----------------+
                       +-[+5V]
--<Pot> is   --[Wiper]-+
                       +-[GND]
                                
*/