Wemos D1 mini Pro

D1 mini Pro is a wifi board with 16MB flash, external antenna connector and built-in ceramic antenna based on ESP-8266EX

Features:

- 11 digital input/output pins
- Interrupt/pwm/I2C/one-wire
- 1 analog input(3.2V max input)
- 16M bytes(128M bit) Flash
- External antenna connector
- Built-in ceramic antenna
- New CP2104 USB-TO-UART IC
- Same size as D1 mini, but more light

Pinout D1 mini Pro

Pin	Function	ESP-8266 Pin
TX	TXD	TXD
RX	RXD	RXD
A0	Analog input, max 3.3V input	A0
D0	IO	GPIO16
D1	IO, SCL	GPIO5
D2	IO, SDA	GPIO4
D3	IO, 10k Pull-up	GPIO0
D4	IO, 10k Pull-up, BUILTIN_LED	GPIO2
D5	IO, SCK	GPIO14
D6	IO, MISO	GPIO12
D7	IO, MOSI	GPIO13
D8	IO, 10k Pull-down, SS	GPIO15
G	Ground	GND
5V	5V	–
3V3	3.3V	3.3V
RST	Reset	RST

Board schematics

If you want to enable external antenna, you must change the position of the zero ohm resistor (R16 from the schematics), see the red line in the picture