COMPONENTS-

Arduino or Genuino Board X 1

Tactile Switch X 1

10K ohm resistor

Jumper Wires

THEORY-

Connect three wires to the board. The first two, red and black, connect to the two long vertical rows on the side of the breadboard to provide access to the 5 volt supply and ground. The third wire goes from digital pin 2 to one leg of the pushbutton. That same leg of the button connects through a pull-down resistor (here 10K ohm) to ground. The other leg of the button connects to the 5 volt supply. When the pushbutton is open (unpressed) there is no connection between the two legs of the pushbutton, so the pin is connected to ground (through the pull-down resistor) and we read a LOW. When the button is closed (pressed), it makes a connection between its two legs, connecting the pin to 5 volts, so that we read a HIGH. You can also wire this circuit the opposite way, with a pullup resistor keeping the input HIGH, and going LOW when the button is pressed. If so, the behavior of the sketch will be reversed, with the LED normally on and turning off when you press the button.

CONNECTIONS-

CODE-

const int buttonPin = 2; // the number of the pushbutton pin

const int ledPin = 13; // the number of the LED pin

int buttonState = 0; // variable for reading the pushbutton status

void setup()

{

// initialize the LED pin as an output:

pinMode(ledPin, OUTPUT); // initialize the pushbutton pin as an input:

pinMode(buttonPin, INPUT);

}

void loop()

{

// read the state of the pushbutton value:

buttonState = digitalRead(buttonPin);

// check if the pushbutton is pressed. If it is, the buttonState is HIGH:

if (buttonState == HIGH)

{

// turn LED on:

digitalWrite(ledPin, HIGH);

}

else

{

// turn LED off:

digitalWrite(ledPin, LOW);

}

}

*do comment if there is any problem while making this project