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Arduino Tutorial

Arduino, arduino unno

LED Control by Push button

control led with push switch

To control an LED by a push button using an Arduino Uno, you will need the following components:

  1. Arduino Uno board
  2. LED (Light-Emitting Diode)
  3. Resistor (typically around 220 ohms)
  4. Push button
  5. Breadboard
  6. Jumper wires

Here are the step-by-step instructions to control an LED with a push switch using Arduino Uno:

  1. Connect one terminal of the push switch to the Arduino board’s digital pin. For example, connect it to pin 2.
  2. Connect the other terminal of the push switch to the Arduino’s ground (GND) pin.
  3. Connect the positive (longer) leg of the LED to a digital pin. For example, connect it to pin 13.
  4. Connect the negative (shorter) leg of the LED to a resistor.
  5. Connect the other end of the resistor to the Arduino’s ground (GND) pin.

Now let’s handle the programming part:

  1. Open the Arduino IDE on your computer.
  2. Write the following code:
const int switchPin = 2;   // The pin connected to the push switch
const int ledPin = 13;     // The pin connected to the LED
int ledState = LOW;        // Variable to store the LED state

void setup() {
  pinMode(switchPin, INPUT);    // Set the switch pin as input
  pinMode(ledPin, OUTPUT);      // Set the LED pin as output
}

void loop()
{
  if (digitalRead(switchPin) == HIGH)   // If the switch is pressed
  {
    ledState = !ledState;               // Toggle the LED state
    digitalWrite(ledPin, ledState);     // Update the LED
    delay(250);                         // Debounce delay
  }
}
 
  1. In the Arduino IDE, select the correct board type and port from the “Tools” menu.
  2. Click on the “Upload” button to upload the code to the Arduino board.
  3. Now, when you press the push switch, the LED connected to pin 13 will toggle its state (on/off).

That’s it! You have successfully controlled an LED by a push switch using Arduino Uno.¬†

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