+5V                3.3V               3.3V 3.3V                    3.3V                                        3.3V
             ^                  ^                  ^    ^                        ^                                          ^
     47u     |         100n     |                  |    |                        |                                          |
   +----||---+        +----||---|                  |    |                 100n   |                                          |
   |         |        |         |                 +-+   |               +---||---+----+                                    +-+
   |         |       ---        |            2,2k | |   |               |        |    |                                    | |
  --         |                  |                 | |  \  Boot0        ---       |    |                                    | |
             |                  |                 +-+   \                        |    |                                    +-+
+--------+   |       +---------------------+       |    |   +----------------------------------------------------------+    |
| U  +5V | --+       |          16         | TxD   |    |   |                   16    5                                |    |
| S   D+ | ----------|  6                2 |-------|----|---| 18 RxD PA10       Vdd  Vdda                              |    |
| B   D- | ----------|  5                  | RxD   |    |   |                                                          |    |
|    GND | --+       |                   3 |-------|----|---| 17 TxD PA9                                               |    |
+--------+   |   +---|  4    CH340G        |       |    |   |                                                          |    |
             |   |   |                     |       +----|---| 4 NRST           STM32F030F4P6 - TSSOP20           PF0 2 |----+
             |   |   |                     |       |    |   |                                                          |    |
             |   |   |                     |       |    +---| 1 Boot0                                                  |    |
             |   |   |    7       8        |       |    |   |                                                          |    |
             |   |   +---------------------+       |    |   |  GND  PA0 PA1 PA2 PA3 PA4 PA5 PA6 PA7 PB1 PA13 PA14 PF1  |    |
             |   | 100n   |       |    |           |    |   |  15   6   7   8   9   10  11  12  13  14  19   20    3   |    |
             |  ===       +--|#|--+    |         \     +-+  +----------------------------------------------------------+    |
             |   |        |       |    |      rst \    | |      |   |   |   |   |   |   |   |   |   |    |    |    |        |
             |   |        | 12MHz |    |           |   | | 4,7k |   |   |   |   |   |   |   |   |   |    |    |    |        |
             |   |       ===     ===   |           |   +-+      |   |   |   |   |   |   |   |   |   |    |    |    |        |
             |   |        |       |    |           |    |       |   |   |   |   |   |   |   |   |   |    |    |    |        |
            --- ---      ---     ---  ---         ---  ---     ---  |   |   |   |   |   |   |   |   |    |    |    |        |
                                                                    o   o   o   o   o   o   o   o   o    o    o    o        o
                  +----------+                                     io0 io1 io2 io3 io4 io5 io6 io7 io8  io9  io10  io11  Autorun
                  | AMS 1117 |                                                                     ADC
     5V o----+----|   3.3    |----+----> 3.3V
             |    +----------+    |
             |                    |
            ===                  ===
             |                    |
            ---                  ---