SBRDIYables
Published © GPL3+

Working with an LED and a Push Button

This project demonstrates the use of a push button to operate an LED.

BeginnerProtip183,760
Working with an LED and a Push Button

Things used in this project

Hardware components

Arduino UNO
Arduino UNO
×1
USB Cable 2.0 Type A/B for Arduino Uno
DIYables USB Cable 2.0 Type A/B for Arduino Uno
×1
LED
DIYables LED
×1
Resistor
DIYables Resistor
×2
Jumper Wires
DIYables Jumper Wires
×5
Mini Breadboard 170 Points
DIYables Mini Breadboard 170 Points
×1
Starter Kit
DIYables Starter Kit
Alternatively
×1
Prototype Expansion Board for Arduino Uno
DIYables Prototype Expansion Board for Arduino Uno
Optional
×1
Arduino Uno Case
DIYables Arduino Uno Case
×1
Breadboard Shield for Arduino
DIYables Breadboard Shield for Arduino
×1

Software apps and online services

Arduino IDE
Arduino IDE

Story

Read more

Schematics

Breadboard Diagram

Make connections as shown in the figure

Code

LED ON when button is pressed

Arduino
LED is set to ON when the button is pressed.
const int BUTTON = 2;
const int LED = 3;
int BUTTONstate = 0;

void setup()
{
  pinMode(BUTTON, INPUT);
  pinMode(LED, OUTPUT);
}

void loop()
{
  BUTTONstate = digitalRead(BUTTON);
  if (BUTTONstate == HIGH)
  {
    digitalWrite(LED, HIGH);
  } 
  else{
    digitalWrite(LED, LOW);
  }
}

LED is OFF when button is pressed (Opposite effect)

Arduino
LED is OFF when button is pressed (Opposite effect)
const int BUTTON = 2;
const int LED = 3;
int BUTTONstate = 0;

void setup()
{
  pinMode(BUTTON, INPUT);
  pinMode(LED, OUTPUT);
}

void loop()
{
  BUTTONstate = digitalRead(BUTTON);
  if (BUTTONstate == HIGH)
  {
    digitalWrite(LED, LOW);
  } 
  else{
    digitalWrite(LED, HIGH);
  }
}

Credits

SBR
37 projects • 52 followers
Mechanical Engineer
DIYables
1 project • 89 followers
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Comments

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