Wemos D1 Mini ESP8266 12E Wifi Development Board

The wemos d1 mini esp8266 is a compact, breadboard-compatible mini ESP8266 WiFi development board. It is ideal for IoT, smart home, and sensor projects where space is limited, yet WiFi connectivity is required.

Compatibility

This wemos d1 mini wifi board is fully compatible with the Arduino IDE and NodeMCU firmware, allowing easy programming and development for beginners and professionals.

Header Pins

All I/O pins support interrupt, PWM, I2C, and one-wire communication (except D0). The board comes with long-pin female headers, standard-pin female headers, and male pin headers. Long-pin female headers are ideal for breadboard use while keeping female headers available on top.

USB Connectivity

The mini ESP8266 includes an on-board Micro USB connector with a USB-to-Serial (UART) converter for easy powering and programming via USB cable.

Additional Information

A similar board is the ESP8266 D1 R2 V2.1.0 WiFi Dev Board, which has the Arduino UNO footprint.

Note

The wemos d1 mini esp8266 is a 3.3V device. Use a logic-level converter when connecting 5V sensors or devices.

Features

• 11 digital I/O pins with interrupt, PWM, I2C, and one-wire (except D0)
• 1 analog input (3.2V max)
• Micro USB connection for programming and power
• Compatible with MicroPython, Arduino, and NodeMCU
• Compact size ideal for IoT and embedded projects

Pin Configuration

• ESP8266 Pinout: TX = TXD, RX = RXD, A0 = Analog input (max 3.3V)
• 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 = Ground
• 5V = 5V, 3.3V = 3.3V
• RST = Reset

Board Dimensions

• Length: 34.2 mm (1.35")
• Width: 25.6 mm (1.01")
• Height: 7 mm (0.28")

Package Includes: 1 x wemos d1 mini esp8266, 2 x Long female pins, 2 x Short female pins, 2 x Normal pins