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,Pull-up GPIO0
D4 IO,pull-up, BUILTIN_LED GPIO2
D5 IO, SCK GPIO14
D6 IO, MISO GPIO12
D7 IO, MOSI GPIO13
D8 IO,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

WeMos D1 mini pins and diagram
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