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 Count1️⃣1 ChannelControl 1 device79 BDT2️⃣2 ChannelControl 2 devices135 BDT4️⃣4 ChannelControl 4 devices249 BDT6️⃣6 ChannelControl 6 devices619 BDT8️⃣8 ChannelControl 8 devices699 BDT �� Which channel count should I choose? — Pick the number that matches how many separate devices you want to control. A 1-channel module controls one appliance (e.g. a lamp). A 4-channel lets you control 4 separate devices independently from a single board. For a full smart home room setup, the 8-channel is the best value.⭐ Key Features⚡10A / 250V AC SwitchingControls AC appliances, fans, lights and pumps safely��️Optocoupler IsolationSignal isolation protects your ESP32 or Arduino from damage��LED Per ChannelEach relay has its own LED indicator — see status at a glance��Active Low TriggerTriggered by LOW signal — works with 3.3V and 5V boards��NO / NC / COM TerminalsNormally Open and Normally Closed contacts for flexibility��Universal CompatibilityWorks with Arduino Uno, Nano, ESP32, ESP8266 and all 5V boards�� What Can You Control With a Relay Module?��Smart LightingWiFi controlled lights via ESP32 or ESP8266��️AC Fan ControlAuto fan triggering based on temperature sensor��Water Pump ControlAuto irrigation systems and water level control��Electric Lock ControlRFID or Bluetooth triggered door lock systems��Industrial SwitchingMotor starters, solenoids and machine control�� Who Should Buy This?�� BeginnersFirst AC control project — digital LOW signal from Arduino turns relay on, HIGH turns it off�� StudentsHome automation, smart irrigation, and electrical control system university and college projects⚙️ EngineersIndustrial control prototypes, PLC replacements and multi-channel switching systems��️ HobbyistsSmart home builders, garden automation systems, Bluetooth and WiFi controlled appliances⚔️ Relay Module vs Solid State Relay vs Transistor SwitchUnderstanding when to use a relay versus other switching methodsFeatureTHIS ITEM5V Relay ModuleMechanicalSOLID STATESSR ModuleNo Moving PartsDC ONLYTransistor / MOSFETElectronic SwitchAC Switching✅ Yes — 250V AC✅ Yes — silent❌ DC onlyIsolation✅ Optocoupler✅ Optical❌ No isolationClick SoundYes — audible clickSilentSilentCostVery low — 79 BDTHigherVery lowBest ForHome appliances, AC loadsHigh frequency, silent switchingDC motors, LEDs, low voltage�� Features & SpecificationsFeature ⚙️Details��️ Product Type5V Relay Module (1, 2, 4, 6 or 8 Channel)⚡ Trigger Voltage5V (active LOW trigger)�� Max AC Load10A at 250V AC�� Max DC Load10A at 30V DC��️ IsolationOptocoupler per channel�� LED IndicatorsOne per relay channel�� ContactsNO (Normally Open), NC (Normally Closed), COM�� Compatible WithArduino Uno/Nano, ESP32, ESP8266, all 5V boards�� Quick Start — Relay Control Example ⚠️ Safety Warning: This relay switches mains voltage (220V AC in Bangladesh). Always ensure the mains side wiring is done by a qualified electrician. Never touch live terminals. Insulate all high-voltage connections properly. ��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❓ My relay turns ON when I set the pin HIGH — why?This relay module uses active LOW trigger — meaning LOW turns the relay ON and HIGH turns it OFF. This is the standard behaviour for optocoupler-isolated relay boards. Always initialise the relay pin as HIGH in setup() to ensure the relay is OFF on startup.❓ Can I control this relay with ESP32 at 3.3V?Yes — most optocoupler-isolated relay modules trigger reliably from 3.3V logic on ESP32 and ESP8266. However, the relay coil itself needs 5V power (VCC), which you provide from the 5V pin on your board or a separate 5V supply. The signal pin uses 3.3V from the GPIO.❓ What is the 5V Relay Module price in Bangladesh?The 5V Relay Module price in BD starts from 79 BDT (1 channel) up to 699 BDT (8 channel) from Dream RC — the best prices in Bangladesh with fast delivery and Cash on Delivery nationwide.�� 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. View ESP32 30 Pin → 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. View ESP32 38 Pin → 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. View ESP8266 NodeMCU →�� Package Includes ��1 × 5V Relay Module — Your Selected Channel CountPlease 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.✅ COD AvailablePay after receiving⚡ Fast DispatchQuick processing�� Inside Dhaka69 BDT — 24 hrs�� Outside Dhaka129 BDT — 24–72 hrs
