3.3V                                  3.3V
                        100n       ^     10uF                            ^
                             | |   |   || |                              |
                        +----| |---+---|| |-----+                        |
                        |    | |   |   || |     |                        |            3.3V
                        |          |            |                        |             ^
                       ---       9 |           ---                       |             |
                 +----------------------------------+            +--------------+      |
                 |                Vdd               | 15         |              |      |  JP1
                 |                              PC5 |------------| clk   S      |      o
                 |                                  | 16         |       T  LED |------o  LED-Spannungsselektor
              18 |                              PC6 |------------| sda   7      |      o  Display
      o----------| PD1                              | 14         |       7      |      |
    SWDIO        |           CH32V003F4P6       PC4 |------------| dc    3      |      |
      o          |                                  | 12         |       5      |      |
      |          |                              PC2 |------------| rst          |      |
      |          |                                  | 13         |              |     ---
      |          |                              PC3 |------------| cs           |
      |          |  gnd   PD2    PA2    PC0    PA1  |            |      LCD     |
     ---         +----------------------------------+            +--------------+
                   7 |  19 |    6 |   10 |    5 |                        |
                     |     |      |      |      |                        |
                     |    \     \       \      \                         |
                     |     \     \       \      \                        |
                     |     |      |      |      |                        |
                     |     |      |      |      |                       ---
                    ---   ---    ---    ---    ---

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