Overview
The Wemos D1 Mini is a mini WiFi board based on the ESP-8266EX. It offers a perfect balance between size and functionality. Despite its tiny size (approx. 34mm x 25mm), it packs a full WiFi stack, 4MB of flash memory, and 11 digital input/output pins. It is widely loved by the “Home Assistant” and “ESPHome” communities because it can be hidden inside light switches, small sensors, or 3D-printed enclosures where a standard NodeMCU simply won’t fit.
Key Features
Ultra-Compact Footprint: Less than half the size of a NodeMCU, making it ideal for wearable and space-critical IoT.
Plug-and-Play USB: Features a Micro-USB port for easy programming and power (using the CH340 or CP2104 driver).
Arduino Compatible: Program it using the Arduino IDE, MicroPython, or Lua.
WiFi Connectivity: Integrated 802.11 b/g/n support for cloud data logging and remote control.
Shield Ecosystem: Compatible with a wide range of “D1 Mini Shields” (Relay, DHT11, MicroSD, etc.) that stack directly on top.
Technical Specifications
| Feature | Specification |
| Microcontroller | ESP-8266EX (ESP-12E Module) |
| Operating Voltage | 3.3V (Onboard 5V to 3.3V Regulator) |
| Digital I/O Pins | 11 (All support Interrupt/PWM/I2C/One-Wire) |
| Analog Input | 1 (Max input: 3.2V) |
| Clock Speed | 80 MHz / 160 MHz |
| Flash Memory | 4 Megabytes |
| USB Interface | Micro-USB (Power and Data) |
| Dimensions | 34.2mm x 25.6mm |
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