Wemos D1 Mini V4 Type-C

Wemos D1 Mini V4 ESP8266 Development Board

The Wemos D1 Mini V4 is a small yet versatile WiFi development board based on the Espressif ESP8266EX. Its compact size and familiar D1 Mini pinout make it suitable for a wide range of IoT and embedded projects.

This V4 version comes with a modern USB Type-C connector and CH340C USB-to-Serial interface, making programming and serial communication easy from a computer. It includes 4MB (32Mbit) external flash memory for storing firmware and application data.

The board can be programmed using popular platforms such as Arduino IDE and MicroPython, making it suitable for beginners as well as experienced developers.

Main Features

• ESP8266EX WiFi microcontroller
• 4MB / 32Mbit Flash Memory
• CH340C USB-to-UART interface
• USB Type-C connector
• 11 × Digital I/O pins
• 1 × Analog input
• Built-in 2.4GHz WiFi
• Supports Arduino IDE and MicroPython
• Supports GPIO, PWM, I2C, SPI, UART and other interfaces
• Compact D1 Mini form factor
• 3.3V logic
• Ideal for IoT and automation projects

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Technical Specifications

Specifications are based on the official LOLIN D1 Mini V4 documentation and schematic.

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Applications

• IoT projects
• Smart home automation
• WiFi sensor nodes
• Home Assistant projects
• ESPHome projects
• Web server projects
• MQTT devices
• Remote monitoring
• Robotics and automation
• Arduino projects
• DIY electronics

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Why Choose D1 Mini V4?

The D1 Mini V4 combines the popular ESP8266 platform with a compact form factor and convenient USB Type-C connectivity. Its 4MB flash, built-in WiFi and wide software support make it a practical development board for both prototyping and finished IoT projects.