Description
The 5V Relay Module is an essential component for any project that needs to control high-voltage appliances, motors, or AC devices using a low-power microcontroller signal. Available in 1, 2, 4, 6, and 8 channel configurations — each relay can switch up to 10A at 250V AC or 30V DC, making it suitable for controlling lights, fans, pumps, heaters, and virtually any electrical device from your Arduino, ESP32, or ESP8266.
Each channel features an optocoupler for signal isolation, protecting your microcontroller from high-voltage spikes. With a standard 5V trigger signal and LED status indicators per channel, this relay module is the most practical and affordable way to add real-world switching control to your IoT and automation projects in Bangladesh.
🔀 Choose Your Channel Count
1️⃣
1 Channel
Control 1 device
79 BDT
2️⃣
2 Channel
Control 2 devices
135 BDT
4️⃣
4 Channel
Control 4 devices
249 BDT
6️⃣
6 Channel
Control 6 devices
619 BDT
8️⃣
8 Channel
Control 8 devices
699 BDT
⭐ Key Features
10A / 250V AC Switching
Controls AC appliances, fans, lights and pumps safely
Optocoupler Isolation
Signal isolation protects your ESP32 or Arduino from damage
LED Per Channel
Each relay has its own LED indicator — see status at a glance
Active Low Trigger
Triggered by LOW signal — works with 3.3V and 5V boards
NO / NC / COM Terminals
Normally Open and Normally Closed contacts for flexibility
Universal Compatibility
Works with Arduino Uno, Nano, ESP32, ESP8266 and all 5V boards
🚀 What Can You Control With a Relay Module?
💡
Smart Lighting
WiFi controlled lights via ESP32 or ESP8266
🌡️
AC Fan Control
Auto fan triggering based on temperature sensor
💧
Water Pump Control
Auto irrigation systems and water level control
🚪
Electric Lock Control
RFID or Bluetooth triggered door lock systems
🏭
Industrial Switching
Motor starters, solenoids and machine control
👤 Who Should Buy This?
🎓 Beginners
First AC control project — digital LOW signal from Arduino turns relay on, HIGH turns it off
📚 Students
Home automation, smart irrigation, and electrical control system university and college projects
⚙️ Engineers
Industrial control prototypes, PLC replacements and multi-channel switching systems
🛠️ Hobbyists
Smart home builders, garden automation systems, Bluetooth and WiFi controlled appliances
⚔️ Relay Module vs Solid State Relay vs Transistor Switch
Understanding when to use a relay versus other switching methods
| Feature | THIS ITEM 5V Relay Module Mechanical | SOLID STATE SSR Module No Moving Parts | DC ONLY Transistor / MOSFET Electronic Switch |
|---|---|---|---|
| AC Switching | ✅ Yes — 250V AC | ✅ Yes — silent | ❌ DC only |
| Isolation | ✅ Optocoupler | ✅ Optical | ❌ No isolation |
| Click Sound | Yes — audible click | Silent | Silent |
| Cost | Very low — 79 BDT | Higher | Very low |
| Best For | Home appliances, AC loads | High frequency, silent switching | DC motors, LEDs, low voltage |
🔧 Features & Specifications
💻 Quick Start — Relay Control Example
Relay On/Off Toggle Example (Arduino / ESP32)
#define RELAY_PIN 5 // Connect relay IN to GPIO5 (ESP32) or pin 5 (Arduino) void setup() { pinMode(RELAY_PIN, OUTPUT); digitalWrite(RELAY_PIN, HIGH); // HIGH = relay OFF (active LOW) } void loop() { digitalWrite(RELAY_PIN, LOW); // LOW = relay ON — device turns ON delay(2000); digitalWrite(RELAY_PIN, HIGH); // HIGH = relay OFF — device turns OFF delay(2000); }
For multiple channels, define additional relay pins and control each independently with separate digitalWrite() calls.
❓ Frequently Asked Questions
🔗 Pair With These Development Boards
ESP32 Type-C (30 Pins)
The ideal partner — control your relay over WiFi and Bluetooth from your phone. Build a complete smart home switch with ESP32 + relay + any home appliance.
ESP32 Type-C (38 Pins)
Controlling an 8-channel relay board? The ESP32 38-pin has enough GPIO pins for all 8 relay channels plus sensors, displays and other peripherals — no pin shortage.
ESP8266 NodeMCU (Type-C)
Budget WiFi control for a 1 or 2 channel relay — the ESP8266 is perfect for a simple WiFi-controlled smart switch at the lowest possible cost.
📦 Package Includes
1 × 5V Relay Module — Your Selected Channel Count
Please select your required channel count (1, 2, 4, 6, or 8) from the variation selector above before adding to cart.
💬 5V Relay Module Price in BD & Why Buy From Dream RC?
The 5V Relay Module price in BD starts from 79 BDT (1 channel) and goes up to 699 BDT (8 channel). Buy relay modules in Bangladesh from Dream RC — your trusted source for electronics, automation components and IoT modules at the best price with fast nationwide delivery and Cash on Delivery.
Pay after receiving
Quick processing
69 BDT — 24 hrs
129 BDT — 24–72 hrs