Arduino Button : Extremely for Beginners

If you are a beginner to arduino, you must understand the working of button in arduino programme. Even this is a basic and looking simple, it will be more useful to create big huge programmes.

If you are expecting to follow this tutorial you may need the following parts

1.Arduino uno board

2.Push on switch

3.LED

4.120ohm Resistors

5.Project board

6.jumping wires

Video Tutorial

Construction of wiring.

You can follow the following steps to do the wiring.

This tutorial gives you 4 ways of buttons.

OPTION 01

This is very simple. If you press the button the LED will on and just release the button, LED will off

The code is as follows.

/* This is to describe the beginners about buttons using arduino.

When the button is pressed, the LED on and when release the button LED will off.
Created on 31/01/2021
By Indika Basnayaka
for SetNFix Yiutube Channel
*/
int LED=5;
int Button=6;
int i;


void setup() {
  // put your setup code here, to run once:
pinMode(LED, OUTPUT);
pinMode(Button,INPUT);
}

void loop() {
 
i = digitalRead(Button);

  if (i == 1){
    digitalWrite(LED,HIGH);
  }
else{
  digitalWrite(LED,LOW);
}
}

This option is with delay option. When the button is pressed the LED on. Even after the button is released. the LED will keep On until a given time. If the delay is 5 seconds the LED will off after 5 seconds.

/* This is to describe the beginners about buttons using arduino.
When the button is pressed, the LED on and after the given delay the LED will off.
Created on 31/01/2021
By Indika Basnayaka
for SetNFix Yiutube Channel
*/

int LED=5;
int Button=6;
int i;


void setup() {
  // put your setup code here, to run once:
pinMode(LED, OUTPUT);
pinMode(Button,INPUT);
}

void loop() {
 
  i = digitalRead(Button);

  if (i == 1){
    digitalWrite(LED,HIGH);
    delay(2000); // 1000 = 1s
  }
else{
  digitalWrite(LED,LOW);
}
}

OPTION 03

This is to describe the beginners about buttons using arduino.

When the LED on if you press and release the button , the LED will off. then again press and release the button LED will on. If you press and hold the button, LED will on and off continuously

/* This is to describe the beginners about buttons using arduino.
When the LED on if you press and release the buttin , the LED will off. then again press and release the button LED will on.
If you press and hold the buttin, LED will on and off continuously
Created on 31/01/2021
By Indika Basnayaka
for SetNFix Yiutube Channel
*/



int LED=5;
int Button=6;
int i;


void setup() {
  // put your setup code here, to run once:
pinMode(LED, OUTPUT);
pinMode(Button,INPUT);
}

void loop() {
  
  i = digitalRead(Button);

  if (i == 1){ delay(300);
    if (!(digitalRead(LED))){
      delay(300);
      digitalWrite(LED,HIGH);
    } else {digitalWrite(LED,LOW);}
    
    }
  }

OPTION 04

This is an advanced coding. This is used the time mills() code. that is milliseconds. You can use this code for most of projects. The operation of the button is more accurate.

CODE

/*
  Debounce

  Each time the input pin goes from LOW to HIGH (e.g. because of a push-button
  press), the output pin is toggled from LOW to HIGH or HIGH to LOW. There's a
  minimum delay between toggles to debounce the circuit (i.e. to ignore noise).

  The circuit:
  - LED attached from pin 13 to ground
  - pushbutton attached from pin 2 to +5V
  - 10 kilohm resistor attached from pin 2 to ground

  - Note: On most Arduino boards, there is already an LED on the board connected
    to pin 13, so you don't need any extra components for this example.

  created 21 Nov 2006
  by David A. Mellis
  modified 30 Aug 2011
  by Limor Fried
  modified 28 Dec 2012
  by Mike Walters
  modified 30 Aug 2016
  by Arturo Guadalupi
  modified 01/31/2021
  By Indika Basnayaka for
  SetNfix Youtube Channel

  This example code is in the public domain.

  http://www.arduino.cc/en/Tutorial/Debounce
*/

// constants won't change. They're used here to set pin numbers:
const int buttonPin = 6;    // the number of the pushbutton pin
const int ledPin = 5;      // the number of the LED pin

// Variables will change:
int ledState = HIGH;         // the current state of the output pin
int buttonState;             // the current reading from the input pin
int lastButtonState = LOW;   // the previous reading from the input pin

// the following variables are unsigned longs because the time, measured in
// milliseconds, will quickly become a bigger number than can be stored in an int.
unsigned long lastDebounceTime = 0;  // the last time the output pin was toggled
unsigned long debounceDelay = 50;    // the debounce time; increase if the output flickers

void setup() {
  pinMode(buttonPin, INPUT);
  pinMode(ledPin, OUTPUT);

  // set initial LED state
  digitalWrite(ledPin, ledState);
}

void loop() {
  // read the state of the switch into a local variable:
  int reading = digitalRead(buttonPin);

  // check to see if you just pressed the button
  // (i.e. the input went from LOW to HIGH), and you've waited long enough
  // since the last press to ignore any noise:

  // If the switch changed, due to noise or pressing:
  if (reading != lastButtonState) {
    // reset the debouncing timer
    lastDebounceTime = millis();
  }

  if ((millis() - lastDebounceTime) > debounceDelay) {
    // whatever the reading is at, it's been there for longer than the debounce
    // delay, so take it as the actual current state:

    // if the button state has changed:
    if (reading != buttonState) {
      buttonState = reading;

      // only toggle the LED if the new button state is HIGH
      if (buttonState == HIGH) {
        ledState = !ledState;
      }
    }
  }

  // set the LED:
  digitalWrite(ledPin, ledState);

  // save the reading. Next time through the loop, it'll be the lastButtonState:
  lastButtonState = reading;
}