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WeMos D1 Mini 1 Ch Relay Module

The 1-Channel Relay Module for D1 Mini is a compact expansion module designed to provide an easy interface between D1 Mini / ESP8266 development boards and high-voltage or high-current devices. It allows microcontrollers to safely control external loads such as lights, motors, pumps, and home automation devices through a relay output. The module integrates directly with the D1 Mini ecosystem and is fully compatible with the Arduino IDE, making it suitable for rapid IoT development and smart control applications. In addition to relay control, it provides an extra digital I/O pin and an ADC input, while supporting OTA (Over-The-Air) firmware updates for wireless programming without requiring a USB connection.

Package Includes

  • 1 × 1-Channel Relay Module for D1 Mini
Wemos ESP8266 Shield
12.00 AED 12.00 AED (Tax included)

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Features

  • Designed specifically for D1 Mini / ESP8266 development boards.
  • Controls high-voltage and high-current devices through a relay interface.
  • Fully compatible with Arduino IDE programming environment.
  • Provides 1 digital I/O pin for additional peripherals.
  • Includes 1 ADC input pin supporting 0–3.3V analog signals.
  • Supports OTA (Over-The-Air) wireless firmware updates.
  • Compact design for installation in small IoT enclosures.
  • Easy plug-in integration with D1 Mini boards.
  • Suitable for smart home and automation applications.

Principle of Operation

The relay module works as an electrically controlled switch between the D1 Mini controller and an external load. When the D1 Mini sends a control signal, the onboard relay activates and changes the state of its contacts, allowing the microcontroller to switch devices that require higher voltage or current than the GPIO pins can provide. The module communicates with the D1 Mini through digital control signals, while the onboard interface provides additional GPIO and analog input capability for connecting sensors or other peripherals.

Applications

  • Smart home automation systems
  • Remote appliance control
  • IoT switching applications
  • Lighting control systems
  • Motor and pump control
  • Industrial automation prototypes
  • Wireless control projects
  • ESP8266-based embedded systems
  • DIY smart switches
  • Educational IoT projects

Pinout

Mini D1 Relay Shield - Micro Robotics

Pin Function
Digital I/O Relay control / additional digital input-output
A0 Analog input (0–3.3V)
VCC Power supply
GND Ground

Wiring

The module connects directly to a D1 Mini board through the onboard headers. The relay is controlled from the D1 Mini GPIO, while external devices are connected to the relay output terminals.

1 Way Relay Module High Level Trigger - iFuture Technology

Connection Description
D1 Mini Plug directly into the relay expansion module
Relay Input Controlled by D1 Mini digital signal
Relay COM Common relay contact
Relay NO Normally Open contact
Relay NC Normally Closed contact
A0 Connect analog sensors requiring 0–3.3V input

Specifications

Product Type 1-Channel Relay Expansion Module
Compatibility D1 Mini / ESP8266 Development Boards
Relay Channels 1 Channel
Digital I/O 1 Digital Pin
ADC Input 1 Channel (0–3.3V)
Programming Support Arduino IDE
Firmware Update OTA Wireless Update Support
Module Size 27.6mm × 25.8mm
Application IoT, Automation, Smart Control Systems

Resources