Home Arduino How to connect a push button to Arduino and control (on/off) an LED

How to connect a push button to Arduino and control (on/off) an LED

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How to connect a push button to Arduino and control (on/off) an LED
connect a push button to Arduino and control an LED
A push button is a type of switch that connects two points. For Example Led turn on when you press the button. It turns off when you release the Push-button.

Material Required

Component name Quantity
Arduino1
LED1
10k Resistor1
220ohm Resistor1
Jumper wiredas per requirement
Breadboard1
Push Button1

Push Button

When the button is not pressed there is no connection between legs you will get a low output. When the button is pressed, it makes the circuit complete and you will get a high output.

Circuit and connection

  • Connect one end of the push button to Arduino pin 8. Connect the other end of the pushbutton to the 10k ohm resistor (pull down) and then to +5V, the other end of the resistor to ground. As shown in the diagram.
  • There is a series connection of the Positive end of the LED and 220-ohm resistor to Arduino pin 9. The negative leg of LED should be connected to the ground.

Code

  • Copy the following code and upload it to your Arduino.
int ledPin = 9; // choose the pin for the LED
int inPin = 8;   // choose the input pin (for a pushbutton)
int val = 0;     // variable for reading the pin status

void setup() {
  pinMode(ledPin, OUTPUT);  // declare LED as output
  pinMode(inPin, INPUT);    // declare pushbutton as input
}

void loop(){
  val = digitalRead(inPin);  // read input value
  if (val == HIGH) {         // check if the input is HIGH (button released)
    digitalWrite(ledPin, LOW);  // turn LED OFF
  } else {
    digitalWrite(ledPin, HIGH);  // turn LED ON
  }
}

 
  • In the program below, the first thing you do is to initialize pin 9 as an output pin with pinMode( ) function in setup( ) routine.
  • The loop( ) routine runs over and over again, forever. In the main loop, you read the state of button (pressed=high, unpressed=low) and you store it in buttonState variable. When button pressed once, the led turns on, and when pressed twice, the led turns off.

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