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The WeMos D1 Mini is an inexpensive ESP8266-based WiFi board that is low-profile but just as powerful as any NodeMCU or ESP8266-based microcontroller. The D1 Mini is incredibly versatile because it is inexpensive, WiFi-enabled, and fully compatible with the Arduino platform. In this tutorial, the ESP8266 library and board manager will be introduced in order to get the D1 Mini acting as an Arduino board. Then, a simple web page will be introduced with the intention of harnessing the WiFi capabilities of the module. The D1 Mini will act as a web server, allowing any WiFi-connected device to interact with the board and control its pins wirelessly.
11 digital IO, interrupt/pwm/I2C/one-wire supported(except D0)
1 analog input(3.2V max input)
a Micro USB connection
Compatible with MicroPython, Arduino, nodemcu
Pin
Function
ESP-8266 Pin
TX
TXD
TXD
RX
RXD
RXD
A0
Analog input, max 3.2V
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
Operating Voltage
3.3V
Digital I/O Pins
11
Analog Input Pins
1(3.2V Max)
Clock Speed
80/160MHz
Flash
4M Bytes
Size
34.2*25.6mm
Weight
3g
You can create your program script with the Arduino IDE and use the Arduino IDE to flash your code to the ESP8266 WeMos D1 Mini. There is only a small change in the Arduino IDE that is described in the following steps:
In the Arduino IDE menu click on File → Preferences
Insert the following URL in the field “Additional Boards Manager URLs:”: http://arduino.esp8266.com/stable/package_esp8266com_index.json
The following picture shows the result in the preferences menu.
The second step is to install the necessary packages for the ESP8266 module:
Click in the Arduino IDE on Tools → Board → Board Manager.
Now search for NodeMCU or ESP8266 and you will find the esp8266 by ESP8266 Community. Install the latest version of the board.
After the installation you can select the ESP8266 WeMos D1 Mini that has the name “LOLIN(WEMOS) D1 R2 & mini” under Tools → Board.
