2 Channel 5V Relay Board Module
2 Channel 5V Relay Board Module Original price was: 149৳ .Current price is: 135৳ .
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1-Channel Relay Module - 12V (High and Low Level Trigger)
1-Channel Relay Module - 12V (High and Low Level Trigger) Original price was: 145৳ .Current price is: 130৳ .
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4 Channel 5V Relay Board Module
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4 Channel 5V Relay Board Module

SKU: EBL-1088

Specifications:

  • No. of Channel: 4
  • Trigger Voltage: 5VDC
  • Triode drive, increasing relay coil
  • High impedance controller pin
  • Pull-down circuit for the avoidance of malfunction
  • Power supply indicator and Control indicator lamp
  • Power supply and relay instructions, lit, the disconnect is off;

Original price was: 279৳ .Current price is: 240৳ .

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Description

🔌 4 Channel 5V Relay Board Module

Quad Channel | 10A Relay | Arduino Compatible | High Power Switching Module

📌 Overview

The 4 Channel 5V Relay Board Module is an electronic switching module that allows low-voltage microcontrollers to control up to four high-voltage or high-current devices independently.

It is widely used in:

  • Home automation

  • Industrial automation

  • Robotics projects

  • Smart control systems

Each channel contains a 5V relay capable of switching AC or DC loads safely.

⚡ Relay Specifications

Feature Specification
Relay Type Electromagnetic
Operating Voltage 5V DC
Channels 4
Contact Rating 10A 250VAC
Contact Rating 10A 30VDC
Relay Model SRD-05VDC-SL-C (common)

🔌 Input Pin Configuration

Pin Function
VCC 5V Power
GND Ground
IN1 Channel 1 Control
IN2 Channel 2 Control
IN3 Channel 3 Control
IN4 Channel 4 Control

Control logic (most boards):

  • LOW → Relay ON

  • HIGH → Relay OFF

(Some versions may be configurable via jumper.)

🔌 Output Terminals (Per Channel)

Each relay has three screw terminals:

Terminal Function
COM Common
NO Normally Open
NC Normally Closed

Operation:

When relay OFF:

  • COM connected to NC

When relay ON:

  • COM connected to NO

🧠 Working Principle

  1. Microcontroller sends signal to IN pin.

  2. Transistor driver activates relay coil.

  3. Magnetic contact switches.

  4. High-voltage device turns ON or OFF.

Provides electrical isolation between control circuit and load.

💡 Onboard Features

✔ 4 × 5V relays
✔ Transistor driver circuits
✔ Flyback diode protection
✔ 4 × Relay status LEDs
✔ Power indicator LED
✔ Screw terminal blocks
✔ Mounting holes
✔ Jumper for high/low trigger (some versions)

📐 Electrical Specifications

Parameter Value
Supply Voltage 5V
Control Current ~15–20mA per channel
Max Switching Current 10A
Isolation Mechanical isolation

📏 Physical Specifications

  • PCB Color: Blue

  • Large board for stable mounting

  • 4 mounting holes

  • Standard 2.54mm header pins

🎯 Advantages

✔ Control 4 devices independently
✔ Safe high-voltage control
✔ Easy Arduino integration
✔ Reliable and durable
✔ Ideal for automation projects

📦 Applications

  • Smart home systems

  • AC light & fan control

  • Motor control systems

  • Pump automation

  • Industrial automation

  • Smart irrigation systems

  • IoT-based switching systems

🆚 2 Channel vs 4 Channel Relay

Feature 2 Channel 4 Channel
Number of Loads 2 4
Board Size Medium Larger
Control Pins 2 4
Suitable For Small Projects Large Automation

⚠ Safety Notes

  • Handle AC mains voltage carefully.

  • Do not exceed 10A rating.

  • Use proper wire gauge.

  • Ensure safe insulation.

  • Avoid touching terminals when powered.

🧑‍💻 Basic Arduino Example

int relay1 = 7;
int relay2 = 8;
int relay3 = 9;
int relay4 = 10;void setup() {
pinMode(relay1, OUTPUT);
pinMode(relay2, OUTPUT);
pinMode(relay3, OUTPUT);
pinMode(relay4, OUTPUT);
}

void loop() {
digitalWrite(relay1, LOW);
digitalWrite(relay2, LOW);
digitalWrite(relay3, LOW);
digitalWrite(relay4, LOW);
delay(2000);

digitalWrite(relay1, HIGH);
digitalWrite(relay2, HIGH);
digitalWrite(relay3, HIGH);
digitalWrite(relay4, HIGH);
delay(2000);
}

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