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Wemos D1 Mini 1-Channel Relay Shield — ESP8266 WiFi Relay, 250V/10A, Home Automation
Wemos D1 Mini 1-Channel Relay Shield ESP8266 WiFi Relay, 250V/10A, Home Automation
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Wemos D1 Mini 1-Channel Relay Shield — ESP8266 WiFi Relay, 250V/10A
The Wemos D1 Mini Relay Shield stacks directly onto a D1 Mini ESP8266 board — adding a 250V/10A SPDT relay to your WiFi-connected microcontroller without any wiring. The relay is controlled by D1 Mini GPIO pin D1 (GPIO5) and includes NO/NC/COM terminals for load connection. Combined with the D1 Mini’s WiFi capability, this creates a complete WiFi-controlled relay in a compact stackable form factor — ideal for smart home switching, MQTT-controlled appliances, and IoT relay projects.
Key Specifications
| Parameter | Value |
|---|---|
| Compatible Board | Wemos D1 Mini (ESP8266) |
| Relay Channels | 1 |
| Contact Type | SPDT (NO / COM / NC) |
| Max AC Load | 250V / 10A |
| Max DC Load | 30V / 10A |
| Control Pin | D1 (GPIO5) |
| Trigger Logic | Active HIGH (D1 Mini GPIO HIGH = relay ON) |
| Indicator LED | Yes (relay status) |
| Form Factor | Shield (stacks directly on D1 Mini) |
| Origin | Mainland China |
Why Choose This Relay Shield?
- No wiring required — stacks directly onto D1 Mini via pin headers
- 250V/10A rating — controls mains-voltage appliances (lights, fans, heaters)
- SPDT contacts — use NO for normally-off or NC for fail-safe normally-on loads
-
GPIO5 control — simple
digitalWrite(D1, HIGH)to activate relay - Status LED — visual confirmation of relay state during development
- Compact stackable design — complete WiFi relay in minimal footprint
Typical Applications
- Smart home switching — WiFi-controlled lights, fans, and appliances via Blynk, Home Assistant, or MQTT
- MQTT relay controller — subscribe to MQTT topic to toggle relay from any device
- Scheduled automation — time-based switching with NTP-synced D1 Mini
- Voice control — integrate with Alexa or Google Home via Sinric Pro or ESPHome
- Remote power control — remotely switch equipment over WiFi from anywhere
Compatible With
Designed exclusively for Wemos D1 Mini (ESP8266-based). Compatible with ESPHome, Tasmota, Arduino IDE, MicroPython, and any firmware that can control a GPIO pin. Works with Home Assistant, Node-RED, MQTT brokers, and cloud platforms.
FAQ
Q: Does this shield work with D1 Mini Pro?
A: Yes. The D1 Mini Pro uses the same pin layout as the D1 Mini, so the relay shield stacks and works identically.
Q: Can I control 220V AC loads?
A: Yes. The relay is rated AC 250V/10A, suitable for 110V and 220V mains loads. Always follow electrical safety regulations when wiring mains voltage.
Q: Which GPIO pin controls the relay?
A: D1 (GPIO5). Set it HIGH to energize the relay, LOW to release it.
Package Contents
- 1× Wemos D1 Mini 1-Channel Relay Shield
- D1 Mini ESP8266 board NOT included
