5V 2-Channel Relay Module TTL – Dual Channel Control Board

12V 2CH Relay Module is a small and easy to use . Use it to control one 240V power appliance directly from Arduino, Raspberry Pi, and other microcontrollers or low voltage circuits. The 5V 2-Channel Relay Module allows microcontrollers like Arduino, Raspberry Pi, and ESP8266 to control high voltage appliances (AC/DC). This opto-isolated relay board supports 2 independent channels, making it ideal for smart home, industrial, and DIY automation systems.

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Tags 5V 2 Channel Relay Module Dual Relay Board Arduino 5V TTL Relay Module Optocoupler Isolated Relay 2CH 2 Channel 5V Relay Switch Arduino Relay Module 5V Home Automation Relay Board

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Made In :	India

The 5V 2-Channel Relay Module with TTL Input is an essential power switching interface board that bridges low-voltage digital microcontrollers with high-voltage electrical appliances. Each channel is equipped with a high-quality electromagnetic relay rated to switch loads up to $10 ext{A}$ at $250 ext{V AC}$ or $30 ext{V DC}$ .

To ensure maximum system safety and stable operation, the board integrates optical isolation (optocouplers) for both channels. This isolates the sensitive digital microcontroller pins ( $3.3 ext{V} / 5 ext{V}$ TTL logic) from high-voltage transients, back-EMF feedback, and electromagnetic interference (EMI) caused by switching inductive loads like AC motors or solenoids.

The module supports both Active-LOW and Active-HIGH trigger configuration options (selectable via onboard jumper on standard models), alongside individual status LEDs that illuminate whenever a relay channel is activated. High-current screw terminal blocks provide secure, solder-free wiring for external AC/DC loads.

Key Features and Benefits

Dual Independent Control Channels: Switch two separate AC or DC electrical loads independently using two digital GPIO signals.
Optocoupler Signal Isolation: High-speed optocouplers separate logic signals from high-power loads to protect microcontrollers against electrical noise and ground loops.
Microcontroller & TTL Compatible: Direct interface with $5 ext{V}$ and $3.3 ext{V}$ logic levels from Arduino, ESP32, Raspberry Pi, STM32, and PIC.
Visual LED Status Indicators: Red power LED indicates board status, while channel-specific LEDs light up when the respective relay triggers.
Heavy-Duty Screw Terminals: Sturdy blue terminal blocks ensure quick, low-resistance connections for heavy wire gauges ( $14 - 22 ext{ AWG}$ ).
Flexible Power Isolation (JD-VCC Jumper): Removable JD-VCC jumper allows powering relay coils separately from the microcontroller's logic power supply for maximum isolation.

Technical Specifications

Feature Component	Specification Details
Relay Channels	2 Independent Channels
Operating Voltage ( $V_{CC}$ )	$5.0 ext{V DC}$
Trigger Signal Voltage ( $IN_1, IN_2$ )	$0 ext{V} - 1.2 ext{V}$ (LOW logic) / $3.0 ext{V} - 5.0 ext{V}$ (HIGH logic)
Trigger Type	Active-LOW (Default on standard boards)
Relay Contact Rating (AC)	$10 ext{A @ 250V AC}$ / $10 ext{A @ 125V AC}$
Relay Contact Rating (DC)	$10 ext{A @ 30V DC}$ / $10 ext{A @ 28V DC}$
Control Current (per channel)	$pprox 15 ext{mA} - 20 ext{mA}$
Contact Type	SPDT (Single Pole Double Throw: NO, COM, NC per channel)
Isolation Type	Optocoupler (PC817 or equivalent)
Response Time	Max $10 ext{ms}$ (On) / Max $5 ext{ms}$ (Off)

Pinout & Wiring Guide

1. Terminal & Header Connections:

Pin / Terminal	Name	Function / Connection
VCC	Power Input	Connect to $+5 ext{V DC}$ Power Supply
GND	Ground	Connect to Common System Ground ( $0 ext{V}$ )
IN1	Logic Trigger 1	Digital Input to trigger Channel 1 Relay
IN2	Logic Trigger 2	Digital Input to trigger Channel 2 Relay
JD-VCC Jumper	Coil Power	Keep shorted with $V_{CC}$ for shared power, or remove to supply independent $5 ext{V}$ coil power
COM (1 & 2)	Common Terminal	Input feed wire for external AC/DC load
NO (1 & 2)	Normally Open	Circuit closes (turns ON) when relay is activated
NC (1 & 2)	Normally Closed	Circuit opens (turns OFF) when relay is activated

2. Typical Wiring Schematic (Arduino Interfacing):

   +-----------------------+                    +-----------------------+
   |      Arduino /        |                    |   5V 2-Channel Relay  |
   |   Microcontroller     |                    |        Module         |
   +-----------------------+                    +-----------------------+
   |  5V Power             |------------------->| VCC                   |
   |  GND                  |------------------->| GND                   |
   |  Digital Pin D2       |------------------->| IN1                   |
   |  Digital Pin D3       |------------------->| IN2                   |
   +-----------------------+                    +-----------------------+

   [EXTERNAL LOAD WIRING - CHANNEL 1]
   AC Mains Live Line ---> COM1 Terminal
   NO1 Terminal       ---> Appliance / Bulb ---> AC Mains Neutral Line

SAFETY WARNING: Working with AC mains voltage ( $110 ext{V} - 230 ext{V}$ ) carries severe risk of electric shock. Always disconnect main power sources before touching screw terminals or wiring. Ensure proper insulation and enclosure protection.

Applications

Smart Home Automation: Remote control of AC lights, ceiling fans, heaters, and appliances via Wi-Fi or Bluetooth.
Industrial Automation: Interfacing PLCs or microcontrollers with solenoid valves, contactors, and pumps.
Robotics & Motor Reversing: Switching high-current DC motors or switching direction in H-bridge configurations.
Security & Access Control: Triggering door strike solenoids, alarm sirens, and gate actuators.