+-----------------+
                 |                 |
           +-----+----+            |
           |          |            |
        D1 -       D2 -            |
           ^          ^            |
           |          |            |VCC
           | +      + |          -----
       Bat -          - Solar-  | AVR |
          ---        --- zelle   -----
           |          |            |GND
           |          |            |
           |          |            |
           |          |            |
           |          |            |
           +----------+------------+
                     GND

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