Single Channel 5V Relay Module (SONGLE) BX6 ,R12

DescriptionWhen a project graduates from blinking tiny 20mA LEDs to controlling physical actuators, you need an electromechanical bridge. The Single Channel 5V Relay Module is the foundational building block for smart home automation and industrial hardware design.Whether you are designing a custom automated pump system for an agricultural IoT dashboard, or setting up the introductory hardware labs for the Electronics Bootcamp, this module is the safest and most reliable way to teach high-power switching.Understanding the Screw Terminals (NO / COM / NC)The output side of the relay features a blue 3-pin screw terminal block for wiring your high-voltage circuit. Understanding how to wire this is critical for your project’s logic:COM (Common): The main live power wire coming from your wall socket or large battery connects here.NO (Normally Open): Connect your appliance here if you want it to be OFF by default. The circuit will only complete (and the appliance will turn on) when you send a signal to trigger the relay.NC (Normally Closed): Connect your appliance here if you want it to be ON by default. Triggering the relay will break the circuit, turning the appliance off (useful for emergency kill switches).Built-In Drive CircuitryYou cannot power a bare relay coil directly from a microcontroller pin, as the coil demands too much current and creates a dangerous reverse voltage spike when it turns off. This breakout board handles all of that for you. It includes a built-in transistor driver circuit to amplify your microcontroller’s tiny signal, as well as an essential flyback diode to absorb any damaging voltage spikes, keeping your Arduino or ESP32 perfectly safe.Visual DebuggingTo make prototyping incredibly easy, the board features two onboard LEDs:Red LED: Illuminates when the VCC and GND pins are receiving 5V power.Green LED: Illuminates when the IN pin receives an active trigger signal, giving you a visual confirmation that your code is working even if you don’t have an appliance hooked up yet.Key Features:Heavy Duty Contacts: The internal Songle relay contacts are rated for up to 10 Amps, allowing it to easily handle standard household appliances or powerful DC motors.Breadboard Friendly Inputs: The standard 2.54mm pitch input header (VCC, GND, IN) easily accepts standard female Dupont jumper wires.Audible Feedback: Provides a satisfying, audible “click” when the relay engages and disengages.Technical Specifications:Relay Model: SRD-05VDC-SL-CTrigger Voltage (VCC): 5V DCTrigger Current: ~15mA to 20mAMaximum AC Load: 10A @ 250V AC / 125V ACMaximum DC Load: 10A @ 30V DC / 28V DCDimensions: ~43mm x 17mm x 17mmMounting: Features standardized holes for securing inside plastic enclosures.Ideal Applications:Smart home lighting and fan automationAutomated agricultural irrigation triggersSwitching 12V/24V accessories on electric motorcycles and roversEducational mechatronics labs demonstrating electromechanical isolationArduino CodeNow that our hardware is all set up, let’s take a look at the code that turns the lamp on.int RelayPin = 6; void setup() { // Set RelayPin as an output pin pinMode(RelayPin, OUTPUT); } void loop() { // Let's turn on the relay... digitalWrite(RelayPin, LOW); delay(3000); // Let's turn off the relay... digitalWrite(RelayPin, HIGH); delay(3000); }Testing the circuitIt will turn on the lamp for 3 seconds and keep it off for the next 3 seconds.