Virtual IoT Lab DEI

Instructions

Objective:

Learn how a push button works as a digital input to control an LED output.

Steps to Perform:

Click "Start Simulation" to power up the Arduino circuit.
Click on the push button to press it.
Observe how the LED turns ON when button is pressed.
Click the button again to release it.
The LED will turn OFF when button is released.

Key Concepts:

Digital Input: Button provides HIGH (pressed) or LOW (released) signal
Pull-down Resistor: 10kΩ resistor keeps input LOW when button not pressed
Digital Output: Arduino writes HIGH/LOW to LED pin to control it
digitalRead(): Reads button state from digital pin 2
digitalWrite(): Sets LED pin HIGH (ON) or LOW (OFF)

Arduino Code - main.ino

            int buttonState = 0;   // Variable to store button input state
const int buttonPin = 2;       // Push button connected to pin 2
const int ledPin = LED_BUILTIN; // Built-in LED on pin 13

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

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

  if (buttonState == HIGH) {
    digitalWrite(ledPin, HIGH);  // Turn LED ON
  } else {
    digitalWrite(ledPin, LOW);   // Turn LED OFF
  }

  delay(10); // Small delay for stable simulation
}
          