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LED AND SWITCH INTERFACE USING ARDUINO

  LED AND SWITCH INTERFACE 

 

 

💡 LED and Switch Interface with Arduino – Short Note

Overview:

Interfacing an LED and a push-button switch with Arduino allows you to control the LED using the button. This is a basic yet essential exercise in understanding digital input and output in Arduino.

⚙️ Required Components:

  • Arduino Uno (or any board)

  • LED (any color)

  • 1 × Push button

  • 220Ω resistor (to limit current)

  • Breadboard and jumper wires

🔌 Circuit Diagram:

 

 

ComponentConnection
LED (anode)Arduino digital pin (e.g., pin 13)
LED (cathode)220Ω resistor → GND
Push buttonOne side to digital pin (e.g., pin 2)
Other sideGND through 10kΩ resistor (pull-down) and also to 5V when pressed

📝 Sample Arduino Code:

int ledPin = 13; // LED connected to pin 13
int buttonPin = 2; // Switch connected to pin 2
int buttonState = 0;

void setup() {
pinMode(ledPin, OUTPUT); // Set LED pin as output
pinMode(buttonPin, INPUT); // Set button pin as input
}

void loop() {
buttonState = digitalRead(buttonPin); // Read button state

if (buttonState == HIGH) {
digitalWrite(ledPin, HIGH); // Turn ON LED if button is pressed
} else {
digitalWrite(ledPin, LOW); // Turn OFF LED if button is not pressed
}
}

 

🧠 Key Points:

  • digitalRead(pin) reads the current status of the button (HIGH or LOW).

  • Use a pull-down resistor to ensure the input pin doesn’t float (avoid random behavior).

  • This project demonstrates how input (switch) can control an output (LED).

 

📞 For More Details & Project Support:

 

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