The schematic includes a small "0-ohm" resistor (jumper) that dictates whether the signal goes to the onboard chip antenna or the external connector.
Understanding the Wemos D1 Mini Pro schematic turns the board from a "black box" into a versatile tool for professional-grade IoT prototyping. Wemos D1 Mini Pro Schematic
The D1 Mini Pro breaks out most ESP8266 pins to a 16-pin (2×8) header with 2.54mm pitch. The schematic clearly labels: The schematic includes a small "0-ohm" resistor (jumper)
When working with the Wemos D1 Mini Pro schematic, keep the following design considerations in mind: Wemos D1 Mini Pro Schematic