1 Channel 5V Relay Module for Arduino – Single Channel Relay Switch Module

The 1 Channel 5V Relay Module is a simple and useful switching module for Arduino, microcontrollers, and DIY electronics projects. It allows a low-voltage control signal from a development board to switch a separate AC or DC electrical load.

This module is commonly used when you want an Arduino, ESP32, ESP8266, STM32, Raspberry Pi, or similar controller to turn devices ON or OFF. It can be used for lighting, small automation systems, motors, pumps, fans, appliances, and other electrical control projects.

The relay module works with a 5V DC supply and includes an onboard relay driver circuit, protection diode, LED indicator, and screw terminals for easy wiring.

Why Use a 5V Relay Module?

Microcontroller boards normally cannot directly switch higher-voltage or higher-current electrical devices. A relay module works as an electrically controlled switch between your controller and the connected load.

For example, an Arduino can send a small digital signal to the relay module, and the relay can then switch a lamp, fan, motor, pump, or another compatible AC/DC device.

This makes the module useful for:

• Arduino automation projects
• Smart home projects
• Lighting control
• Motor and pump control
• Robotics
• Alarm systems
• Embedded electronics
• Industrial control prototypes
• DIY electronic projects

How to Use the Relay Module –

The module normally has control-side pins such as VCC, GND, and IN.

Connect:

VCC to a suitable 5V supply

GND to ground

IN to a digital output pin of your Arduino or microcontroller

The load is connected through the relay screw terminals, usually marked:

• COM – Common
• NO – Normally Open
• NC – Normally Closed
• Use NO when you want the connected device to remain OFF until the relay is activated.
• Use NC when you want the connected device to remain ON until the relay is activated.

Many versions of this module use a low-level trigger, which means the relay activates when the input signal goes LOW. Trigger behaviour can vary between manufacturers, so check your module before final installation.

Key Features –

Single-channel 5V relay switch module

Suitable for Arduino and microcontroller projects

Can switch compatible AC and DC loads

Onboard relay driver circuit

Flyback diode protection

Relay status LED indicator

Easy-to-use screw terminals

Compact PCB design

Simple digital input control

Suitable for automation and switching projects

Specifications –

Product Type: Single Channel Relay Module

Number of Channels: 1

Operating Voltage: 5V DC

Relay Type: Electromechanical Relay

Control Input: Digital Signal

Trigger Type: Low-Level Trigger on many models

Maximum AC Rating: Up to 250V AC / 10A*

Maximum DC Rating: Up to 30V DC / 10A*

Isolation: Optocoupler on selected models

Connection Type: PCB pins and screw terminals

Typical Operating Temperature: 0°C to 70°C

*Actual safe switching capacity depends on the relay model, load type, PCB design, operating voltage, and installation conditions. Inductive loads such as motors and pumps may require additional protection and lower switching limits.

Where Can It Be Used?

The 1 Channel 5V Relay Module can be used in many electronics and automation applications, including:

Home automation systems

Automatic light control
Water pump controllers
Fan control
Motor switching
Smart appliance projects
Arduino projects
ESP32 and ESP8266 projects
Raspberry Pi control projects
Robotics
Embedded systems
Industrial automation prototypes
Remote switching systems
Timer-based ON/OFF controllers
Compatible Development Boards

This relay module can be used with many popular development platforms, including: Arduino Uno, Arduino Nano, Arduino Mega, ESP32, ESP8266, STM32, Raspberry Pi, PIC, AVR, and other compatible microcontroller boards.

Important Safety Note

When switching 230V/250V AC mains electricity, proper insulation, enclosure, wiring, fuse protection, and electrical safety practices are essential. High-voltage wiring should only be handled by someone with suitable electrical knowledge.

The 1 Channel 5V Relay Module is a practical choice for students, hobbyists, developers, and electronics professionals who need a simple way to control electrical loads from an Arduino or microcontroller.