Diagram

WeMos D1 mini

Pin

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

*All IO have interrupt/pwm/I2C/one-wire supported(except D0)

d1 mini shematics

wemos d1 mini shematics

Programming

The D1 mini has a micro USB for auto programming. Also you can programming it using OTA

Warnings

All IO is work at 3.3V.

Source wemos.cc

 

I’ve got the module from here

 
D1 mini ESP8266

WeMos D1 mini pins and diagram
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