DIYables 1 Channel 12V Relay Module Optocoupler Isolation High Low Trigger for Arduino ESP32 ESP8266 Raspberry Pi, Red Board, 3 Pack
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Quick Overview
The DIYables 1-Channel 12V Relay Module is a single-channel relay board designed for 12V operation, allowing microcontrollers such as Arduino, ESP32, ESP8266, and Raspberry Pi to safely switch high-voltage or high-current devices. The module features built-in optocoupler isolation that electrically separates the control circuit from the load circuit, protecting your microcontroller from voltage spikes, back-EMF, and electrical interference.
The module supports both high-level and low-level trigger modes, selectable via an onboard jumper, giving you flexibility to work with any 3.3V or 5V logic system. The simple three-pin control interface — DC+, DC−, and IN — makes wiring straightforward and compatible with virtually any development board. The distinctive red board design features screw terminals on the output side for secure load connections.
This 3-pack is ideal for home automation, lighting control, motor switching, robotics, smart appliances, and general-purpose relay control projects. Perfect for use with Arduino, ESP32, ESP8266, Raspberry Pi, and any other controller with a digital output pin.
Key Features
- 1-Channel 12V Relay — Single channel relay designed for 12V coil operation, ideal for switching high-voltage or high-current loads safely
- Optocoupler Isolation — Built-in optocoupler electrically isolates the control circuit from the load, protecting microcontrollers from voltage spikes and interference
- High and Low Level Trigger — Supports both high-level and low-level trigger selection via onboard jumper for flexible compatibility with 3.3V and 5V systems
- Simple 3-Pin Control Interface — DC+, DC−, and IN pins allow direct and easy connection to Arduino, ESP32, ESP8266, Raspberry Pi, and other controllers
- NO/NC Output Contacts — Normally Open and Normally Closed screw terminals for flexible load wiring
- Red Board Design — Distinctive red PCB with screw terminals for secure and easy load connections
- 3-Pack Value Set — Includes three relay modules for multi-channel projects, automation systems, or spare inventory
- Wide Compatibility — Works with Arduino, ESP32, ESP8266, Raspberry Pi, and any microcontroller with a digital output
- Versatile Applications — Ideal for home automation, lighting control, motor switching, robotics, and DIY electronics
SPECIFICATION
| Specification | Value |
|---|---|
| Product Type | Single-Channel Relay Module |
| Number of Channels | 1 |
| Relay Coil Voltage | 12V DC |
| Board Color | Red |
| Isolation | Optocoupler isolation |
| Trigger Modes | High-level / Low-level (jumper selectable) |
| Control Pins | DC+ (power), DC− (ground), IN (signal) |
| Control Voltage | 3.3V or 5V logic compatible |
| Output Contacts | NO (Normally Open) / NC (Normally Closed) |
| Output Wiring | Screw terminals |
| Max Switching Voltage | 250V AC / 30V DC (typical) |
| Max Switching Current | 10A (typical) |
| Package Quantity | 3 modules |
| Compatibility | Arduino, ESP32, ESP8266, Raspberry Pi, and other 3.3V/5V microcontrollers |
| Applications | Home automation, lighting control, motor switching, robotics, smart appliances, DIY electronics |
PACKAGE
A package includes:
| Qty | Items |
|---|---|
| 3 | 1-channel 12V relay modules (red board, with optocoupler isolation) |
Tutorials
COMPATIBLE HARDWARE
- Arduino boards (UNO, Mega, Nano, etc.) — Digital output pin controls IN signal for load switching
- Arduino Uno R4 WiFi/Minima — WiFi-enabled relay control for smart home projects
- ESP32 development boards — IoT home automation and remote relay switching
- ESP8266 boards (NodeMCU, Wemos D1, etc.) — WiFi relay control for connected projects
- Arduino Nano ESP32 — Compact relay control in embedded automation systems
- Raspberry Pi (all models) — Advanced relay control via GPIO digital output
- Raspberry Pi Pico — Microcontroller relay switching for DIY automation
- AC lights and lamps — Mains lighting control and on/off switching
- DC motors and pumps — Safe switching of 12V/24V motors, water pumps, and fans
- Heaters and cooling fans — Temperature-controlled switching
- Alarms and buzzers — Security system relay integration
- Home appliances — Smart control of 12V or mains-powered appliances
- Solenoid valves — Irrigation and fluid control systems