4 Channel 5V Relay Board Module

Overview

4 Channel 5V Relay Board Module is a compact and versatile multi-channel switching module designed for student, hobby, and electronic automation projects. It allows low-voltage microcontrollers like Arduino, ESP32, and Raspberry Pi to independently control up to four high-voltage and high-current electrical appliances such as lights, fans, motors, solenoids, and pumps safely.

Features

• Controls up to 4 independent electrical loads simultaneously
• Supports 5V DC operating power input
• Capable of switching AC loads up to 250V/10A and DC loads up to 30V/10A per channel
• Built-in optocoupler isolation on each channel for safe signal isolation and MCU protection
• Standard control interface with individual input pins (IN1, IN2, IN3, IN4)
• Independent LED status indicators for power and each relay switching state
• NO (Normally Open), NC (Normally Closed), and COM (Common) screw terminals for each relay
• Low trigger / High trigger configuration support (board variant dependent)
• Compatible with Arduino, ESP32, Raspberry Pi, PIC, and AVR microcontrollers
• Ideal for smart home automation, robotics, multi-zone control, and industrial switching

Applications

• Multi-room or multi-appliance home automation systems for controlling lights, fans, and sockets
• Multi-zone automated plant watering systems with multiple solenoid valves and pumps
• Microcontroller-based student, diploma, and university engineering capstone projects
• Industrial control panels, remote automation systems, and power distribution modules
• Safety alarm, emergency shut-off, and multi-stage power control systems
• Robotics and IoT projects requiring independent high-power switching channels
• Electronics prototyping, science fairs, and DIY hardware automation

Important Notes:

• Always connect the relay module's GND to the microcontroller's GND to establish a common signal reference.
• Exercise extreme caution when working with high-voltage AC mains (110V–220V) to prevent electric shock or damage.
• Do not exceed the maximum rated current (10A per channel) and voltage limits of the relay contacts.
• Ensure your power supply can provide sufficient current (~350mA or higher) when all 4 relays are activated simultaneously.
• Verify whether your specific relay board triggers on a High or Low logic signal before uploading your microcontroller code.
• Properly insulate all high-voltage connections and terminals using protective enclosures or heat-shrink tubing.

Package includes

• 1 x 4 Channel 5V Relay Board Module