Introduction

The 5V 2 Channel Relay Module allows you to control two separate high-voltage/high-current circuits (up to 250VAC/10A each) using low-voltage 5V signals. This module features optocoupler isolation, status LEDs, and both normally open (NO) and normally closed (NC) contacts for each relay.

Key Features

Technical Specifications

Pin Configuration

Pin Label	Description	Connection
VCC	5V Power Input	Connect to 5V supply
GND	Ground	Connect to system ground
IN1	Channel 1 Control	Microcontroller pin 1
IN2	Channel 2 Control	Microcontroller pin 2
NO1/NC1/COM1	Channel 1 Contacts	Load connections
NO2/NC2/COM2	Channel 2 Contacts	Load connections
JD-VCC Jumper	Opto-isolator power	See setup instructions

Wiring with Arduino

// Arduino Dual Relay Control
const int relay1Pin = 8;  // Channel 1 control
const int relay2Pin = 9;  // Channel 2 control

void setup() {
  pinMode(relay1Pin, OUTPUT);
  pinMode(relay2Pin, OUTPUT);
  digitalWrite(relay1Pin, HIGH); // Start with relay OFF (active LOW)
  digitalWrite(relay2Pin, HIGH); // Start with relay OFF (active LOW)
}

void loop() {
  // Alternate relay activation
  digitalWrite(relay1Pin, LOW);  // Activate relay 1
  digitalWrite(relay2Pin, HIGH);
  delay(2000);
  
  digitalWrite(relay1Pin, HIGH);
  digitalWrite(relay2Pin, LOW);  // Activate relay 2
  delay(2000);
}

Jumper Configuration

Application Examples

Safety Precautions

• ⚠️ High Voltage Warning: Treat all mains voltage connections as potentially lethal
• 🔧 Use proper insulated tools when working with live circuits
• 📏 Maintain at least 8mm clearance between low and high voltage sections
• 🔌 Secure all high-voltage connections with screw terminals
• 🔥 Never exceed 10A current rating per channel
• 💧 Keep module away from moisture and conductive debris