ArduinoAlphanumeric

Change of README.txt

1:3743948571b3
README.txt
     1.1 --- a/README.txt	Sun Jan 10 00:30:41 2016 +0100
     1.2 +++ b/README.txt	Sun Jan 10 22:58:17 2016 +0100
     1.3 @@ -1,7 +1,7 @@
     1.4  From the HT16K33 datasheet [1] and EF4058 schematic [2].
     1.5  
     1.6  Addressing
     1.7 -----------
     1.8 +==========
     1.9  
    1.10                              RAM addresses
    1.11                              ROW0..7     ROW8..15
    1.12 @@ -16,7 +16,7 @@
    1.13  ROW3..14 |
    1.14  
    1.15  Tube and Digit Layout
    1.16 ----------------------
    1.17 +=====================
    1.18  
    1.19  By observing the behaviour, the tubes and digits have the following layout:
    1.20  
    1.21 @@ -26,7 +26,7 @@
    1.22  1   2   1   2
    1.23  
    1.24  Communications
    1.25 ---------------
    1.26 +==============
    1.27  
    1.28  I2C commands:
    1.29  
    1.30 @@ -59,7 +59,7 @@
    1.31  -> 00 80 00 40 00 20 00 10 (bytes in LSB, MSB order)
    1.32  
    1.33  LED Digit Layout
    1.34 -----------------
    1.35 +================
    1.36  
    1.37  The digits each have the following layout:
    1.38  
    1.39 @@ -129,8 +129,54 @@
    1.40  
    1.41  
    1.42  
    1.43 +See the shapes.h file for convenient definitions of the different elements.
    1.44 +
    1.45 +Interfacing
    1.46 +===========
    1.47 +
    1.48 +It could be useful to interface the display with circuits and to have an
    1.49 +Arduino sample inputs and update the display to reflect the state of those
    1.50 +inputs. In order to represent 16 different signals with 4 hexadecimal digits,
    1.51 +the following circuit could be employed.
    1.52 +
    1.53 +Inputs  74HC157 74HC157 Arduino Display
    1.54 +------  ------- ------- ------- -------
    1.55 +                        A4/SDA  SDA
    1.56 +                        A5/SCL  SCL
    1.57 +                        5V      VCC
    1.58 +        E#      E#      GND     GND
    1.59 +        S       S       3
    1.60 +D0      1I0
    1.61 +D1      2I0
    1.62 +D2      3I0
    1.63 +D3      4I0
    1.64 +D4              1I0
    1.65 +D5              2I0
    1.66 +D6              3I0
    1.67 +D7              4I0
    1.68 +D8      1I1
    1.69 +D9      2I1
    1.70 +D10     3I1
    1.71 +D11     4I1
    1.72 +D12             1I1
    1.73 +D13             2I1
    1.74 +D14             3I1
    1.75 +D15             4I1
    1.76 +        1Y              4
    1.77 +        2Y              5
    1.78 +        3Y              6
    1.79 +        4Y              7
    1.80 +                1Y      8
    1.81 +                2Y      9
    1.82 +                3Y      10
    1.83 +                4Y      11
    1.84 +
    1.85 +By switching between the two multiplexers, the data signals could be sampled
    1.86 +by the Arduino and appropriate representation values written to the display
    1.87 +module memory.
    1.88 +
    1.89  References
    1.90 -----------
    1.91 +==========
    1.92  
    1.93  [1] EF4058-OCTOPUS_Alphanumeric_V1.0_SCH.pdf
    1.94  [2] EF4058-ht16K33v110.pdf