Relay-module
    Relay Module (5V Single-Channel)

    Relay Module (5V Single-Channel)

    Relay Module
    Switch
    TRIOE
    IoT
    Embedded Systems
    Automation

    A relay is an electrically operated switch that allows a low-power control signal to switch a high-power device, such as a light bulb, fan, or motor. Relay modules are widely used in automation, IoT projects, and home control systems.

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    Specifications

    VCCPower supply (5V)
    GNDGround (-)
    INControl signal from microcontroller
    COMCommon pin for the relay switch
    NONormally open (connected to COM when relay is activated)
    NCNormally closed (connected to COM when relay is deactivated)

    Sample Code

    Crash Course: Control a light bulb with a relay

    Objective

    Teach learners how to use a relay module to control high-power devices with a low-power microcontroller signal.

    Materials Required

    • 5V Relay Module
    • TRIOE
    • Breadboard and jumper wires
    • Light bulb or other load
    • Lamp holder
    • External power supply
    • Multimeter (optional)
    • Safety gloves

    Steps

    1Understanding the Relay

    • A relay is an electrically operated switch
    • Control pins: VCC, GND, and IN connect to microcontroller
    • Switching pins: COM, NO, and NC for high-power devices
    • Understand the difference between NO and NC connections

    2Circuit Setup

    • Connect VCC to TRIOE 5V
    • Connect GND to TRIOE GND
    • Connect IN to TRIOE digital pin 8
    • Connect load between power source and COM/NO pins

    3Safety Considerations

    • Always use proper insulation
    • Wear safety gloves when working with high voltage
    • Double-check all connections before powering on
    • Keep high and low voltage wiring separate

    Video Tutorial: Control a light bulb with a relay

    Video Player Placeholder

    Common Applications

    Application 1

    Description of application 1.

    Application 2

    Description of application 2.

    Application 3

    Description of application 3.

    #define RELAY_PIN 8  // Define the pin connected to the relay module

    void setup() {
      pinMode(RELAY_PIN, OUTPUT);  // Set the relay pin as an output
    }

    void loop() {
      digitalWrite(RELAY_PIN, HIGH); // Turn the relay ON
      delay(2000);                  // Wait for 2 seconds
      digitalWrite(RELAY_PIN, LOW);  // Turn the relay OFF
      delay(2000);                  // Wait for 2 seconds
    }