The 5V 2-Channel Relay Module is a powerful interface board that allows your low-voltage microcontrollers to control high-voltage appliances. At Electrapac, we recommend this module for home automation enthusiasts and industrial hobbyists who need a reliable way to switch lights, fans, pumps, or motors using an Arduino, Raspberry Pi, or ESP32.

Product Overview

This module features two independent relays, each capable of switching up to 10A. It acts as a bridge between the digital world and the electrical world. The board is designed with Opto-isolation, meaning your sensitive microcontroller is physically and electrically protected from the high-voltage side of the circuit. Whether you are building a smart home system or an automated greenhouse, this dual-channel board offers the perfect balance of control and safety.

Key Features for Electrapac Customers

• Opto-Isolated Protection: Features on-board optocouplers that prevent "back-EMF" or electrical noise from your appliances from damaging your Arduino or ESP32.

• Standard Interface: Can be controlled directly by any microcontroller with a 5V digital output. (For 3.3V devices like Raspberry Pi, a simple transistor or level shifter is recommended for optimal triggering).

• Dual Channel Control: Control two separate devices independently. For example, use Channel 1 for a light and Channel 2 for a fan.

• LED Status Indicators: Each channel features a dedicated LED that lights up when the relay is energized, making debugging your code simple and visual.

• High-Quality Terminals: Equipped with screw terminals (NO, COM, NC) for secure wiring to your high-voltage load.

Understanding the Terminals

Each relay on your www.electrapac.com module has three output pins:

1. COM (Common): The center pin where you connect your "Hot" or "Live" wire.

2. NO (Normally Open): The circuit is open (OFF) by default. It closes (ON) only when you trigger the relay. (Best for most applications).

3. NC (Normally Closed): The circuit is closed (ON) by default. It opens (OFF) when you trigger the relay.

Primary Applications

• Smart Home DIY: Controlling AC 220V lamps, fans, or heaters via Wi-Fi or Bluetooth.

• Robotics: Switching high-current DC motors or actuators.

• Agriculture: Automating water pumps and solenoid valves for irrigation.

• Security: Activating sirens or magnetic door locks remotely.

Why Shop at Electrapac?

We source our 2-Channel Relay Boards with genuine Songle relays to ensure they meet their rated current capacities without overheating. At www.electrapac.com, we provide the heavy-duty switching components that bring your code to life in the physical world.