Working with an LED and a Push Button

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

Apr 24, 2019

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293424 views

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23 respects

starter

learners

beginners

Components and supplies

Arduino Uno Rev3

Breadboard (generic)

Resistor 1k ohm

Jumper wires (generic)

LED (generic)

Apps and platforms

Arduino IDE

Project description

Code

LED ON when button is pressed

arduino

LED is set to ON when the button is pressed.

1const int BUTTON = 2;
2const int LED = 3;
3int BUTTONstate = 0;
4
5void  setup()
6{
7  pinMode(BUTTON, INPUT);
8  pinMode(LED, OUTPUT);
9}
10
11void  loop()
12{
13  BUTTONstate = digitalRead(BUTTON);
14  if (BUTTONstate == HIGH)
15  {
16    digitalWrite(LED, HIGH);
17  } 
18  else{
19    digitalWrite(LED,  LOW);
20  }
21}

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)

1const int BUTTON = 2;
2const int LED = 3;
3int BUTTONstate = 0;
4
5void  setup()
6{
7  pinMode(BUTTON, INPUT);
8  pinMode(LED, OUTPUT);
9}
10
11void  loop()
12{
13  BUTTONstate = digitalRead(BUTTON);
14  if (BUTTONstate == HIGH)
15  {
16    digitalWrite(LED, LOW);
17  } 
18  else{
19    digitalWrite(LED, HIGH);
20  }
21}

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);
  }
}

Downloadable files

Breadboard Diagram

Make connections as shown in the figure

Breadboard Diagram

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