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RELAY INTERFACE USING ARDUINO

  1CHANNEL – RELAY INTERFACE 

 

 

💡 RELAY Interface with Arduino – Short Note

Overview:

A 1-channel relay module allows an Arduino to control high-voltage devices like lights, fans, or appliances. It acts as an electrically operated switch that can be turned ON or OFF through a digital pin of the Arduino.

🧠 Working Principle:

  • The Arduino sends a HIGH or LOW signal to the relay’s IN pin.

  • This energizes/de-energizes an internal electromagnet in the relay.

  • The relay toggles between open (OFF) and closed (ON) positions, controlling an external device.

🔌 Circuit Diagram:

 

 

 

 

 

Relay PinConnect To
VCCArduino 5V
GNDArduino GND
INArduino digital pin (e.g., D7)
COM (Common)AC Device Line wire
NO (Normally Open)AC Load

📝 Sample Arduino Code:

int RELAY = 13; // Relay control pin
int LED = 8; // LED pin

void setup() {
pinMode(RELAY, OUTPUT); // Set relay pin as output
pinMode(LED, OUTPUT); // Set LED pin as output
}

void loop() {
digitalWrite(RELAY, HIGH); // Turn ON relay
digitalWrite(LED, HIGH); // Turn ON LED
delay(1000); // Wait for 1 second

digitalWrite(RELAY, LOW); // Turn OFF relay
digitalWrite(LED, LOW); // Turn OFF LED
delay(1000); // Wait for 1 second
}

✅ Applications:

  • Home automation

  • Smart irrigation

  • Fan/light control systems

  • Industrial control panels

 

📞 For More Details & Project Support:

 

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