IC1
                                   -----------
    +3.3V o---+----+              | PCF8574P  |
              |    |              | I2C-Port- |                            HD44780
             .-.  .-.             | Expander  |                            display
        2.2k | |  | | 2.2K        |           |4
             | |  | |             |         P0|----------------------------o 11 D4
             '-'  '-'             |           |5
              |    |    I2C-Bus 14|         P1|----------------------------o 12 D5
    SCL o-----+-------------------|SCL        |6
ADM5120 GPIO/      |              |         P2|----------------------------o 13 D6
        LED        |            15|           |7
    SDA o----------+--------------|SDA      P3|----------------------------o 14 D7
                                  |           |9
                                  |1        P4|----------------------------o 4  RS
           Set I2C-Address  +-----|A0         |10
           here:            |     |2        P5|----------------------------o 5  RW
           GND: Bit:=0      +-----|A1         |11
           VCC: Bit:=1      |     |3        P6|----------------------------o 6  EN
                            +-----|A1         |                      ___
                            |     |           |                 +---|___|--o 15 backlight
                           ===    |           |                 |c   10R
                                  |           |12    ___       b|/ 
                                  |13       P7|-----|___|-----|
                                 -|INT        |      1k       |\
                                  |           |           bc557 |e
                                   -----------                  |
                                                                |
    +5V o-----------+------------------+---------------------+--+----------o 2  VCC
                    |                  |                     |
                    |                  |                     |
                    |10uF              O 16                 .-.
                   ---                IC1                   | |<-----------o 3  Vlcd
                   ---                 O 8                  | |10k
                    |                  |                    '-'
                    |                  |                     |
    GND o-----------+-------+----------+---------------------+-------+-----o 1  GND
                            |                                        |
                           === GND                                   +-----o 16 GND Backlight