🔌 1 Channel 5V Relay Board Module

Single Channel | 10A Relay | Arduino Compatible | Engineers Butty Lab BD

📌 Overview

The 1 Channel 5V Relay Board Module is an electronic switching device that allows low-voltage microcontrollers (like Arduino, ESP32, Raspberry Pi) to control high-voltage or high-current devices safely.

It is widely used in:

• Home automation

• Robotics projects

• Industrial control

• Smart appliances

This module includes a 5V electromagnetic relay, driver circuit, and status LEDs for easy operation.

⚡ Relay Specifications

🔌 Input Pin Configuration

Control logic:

• LOW signal → Relay ON (for most modules)

• HIGH signal → Relay OFF
  (Depends on active-low / active-high version)

🔌 Output Terminal (Screw Terminal)

Working:

• When relay is OFF → COM connected to NC

• When relay is ON → COM connected to NO

🧠 How It Works

1. Microcontroller sends signal to IN pin.

2. Transistor driver activates relay coil.

3. Magnetic field switches internal contacts.

4. High-voltage load turns ON or OFF.

The relay provides electrical isolation between control circuit and load.

💡 Onboard Components

✔ Relay (5V)
✔ Transistor driver
✔ Flyback diode protection
✔ Status LED (Power LED + Relay LED)
✔ Screw terminal block
✔ PCB mounting holes

📐 Electrical Specifications

📏 Physical Specifications

• PCB Color: Blue

• Compact design

• Mounting holes for secure installation

• Standard 0.1” header pins

🎯 Advantages

✔ Easy to use
✔ Arduino compatible
✔ Safe high-voltage control
✔ Compact and affordable
✔ Suitable for beginners

📦 Applications

• AC Light control

• Fan control

• Water pump switching

• Smart home automation

• Industrial equipment control

• Robotics switching systems

• Timer-based control systems

⚠ Safety Notes

• Be careful when working with AC mains voltage.

• Do not exceed 10A load.

• Ensure proper insulation.

• Avoid touching high-voltage terminals when powered.

🆚 Relay vs Transistor Switching

🧑‍💻 Basic Arduino Example