Wemos D1 Mini Pro Schematic |link| ★ (Real)

Notice that the “D0” pin is special. On the schematic, GPIO16 (D0) is disconnected from the main power domain during deep sleep, allowing it to wake the chip via a resistor to RST.

Whether you are debugging a boot loop, designing a low-power weather sensor, or simply trying to understand why your ADC readings are noisy, reading the schematic line-by-line is the only path to success. Wemos D1 Mini Pro Schematic

While functional, the D1 Mini Pro schematic reveals some compromises: Notice that the “D0” pin is special